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# a significance test is conducted for which the alternative hypothesis states that more than 83 percent of all adult sea turtles on a certain beach are female. a random sample of adult sea turtles from the beach found that 85 percent of the sea turtles were female. the p-value for the test is 0.4058. if the null hypothesis is true, which of the following statements is a correct interpretation of the p-value?

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### James

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get a significance test is conducted for which the alternative hypothesis states that more than 83 percent of all adult sea turtles on a certain beach are female. a random sample of adult sea turtles from the beach found that 85 percent of the sea turtles were female. the p-value for the test is 0.4058. if the null hypothesis is true, which of the following statements is a correct interpretation of the p-value? from EN Bilgi.

## Answered: A significance test is conducted for…

Solution for A significance test is conducted for which the alternative hypothesis states that more than 83 percent of all adult sea turtles on a certain beach…

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A significance test is conducted for which the alternative hypothesis states that more than 83 percent of all adult sea turtles on a certain beach are female. A random sample of adult sea turtles from the beach found that 85 percent of the sea turtles were female. The pp-value for the test is 0.4058. If the null hypothesis is true, which of the following statements is a correct interpretation of the pp-value?

Of all possible samples of the same size, 40.58 percent will result in 85 percent of adult sea turtles on the beach being female.

Of all possible samples of the same size, 40.58 percent will result in 85 percent of adult sea turtles on the beach being female.,

A

Of all possible samples of the same size, 40.58 percent will result in 85 percent or more of adult sea turtles on the beach being female.

Of all possible samples of the same size, 40.58 percent will result in 85 percent or more of adult sea turtles on the beach being female.,

B

Of all possible samples of the same size, 40.58 percent will result in 85 percent or less of adult sea turtles on the beach being female.

Of all possible samples of the same size, 40.58 percent will result in 85 percent or less of adult sea turtles on the beach being female.,

C

Of all possible samples of the same size, 20.29 percent will result in 85 percent or more of adult sea turtles on the beach being female.

Of all possible samples of the same size, 20.29 percent will result in 85 percent or more of adult sea turtles on the beach being female.,

D

Of all possible samples of the same size, 20.29 percent will result in 85 percent of adult sea turtles on the beach being female.

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A researcher was interested in the relationship between a swimmer’s hand length and corresponding time to complete the 100-meter freestyle. The researcher selected a random sample of twenty swimmers from all participants in a swim competition. Assuming all conditions for inference are met, which of the following significance tests should be used to investigate whether there is convincing evidence, at a 5 percent level of significance, that a longer hand length is associated with a decrease in the time to complete the 100-meter freestyle?

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Use the pulse rates in beats per minute​ (bpm) of a random sample of adult females listed in the data set available below to test the claim that the mean is less than 70bpm. Use a 0.05 significance level.     Assuming all conditions for conducting a hypothesis test are​ met, what are the null and alternative​ hypotheses?     A. H0​: μ=70 bpm H1​: μ>70 bpm   B. H0​: μ>70 bpm H1​: μ<70 bpm   C. H0​: μ=70 bpm H1​: μ<70 bpm   D. H0​: μ=70 bpm H1​: μ≠70 bpm Determine the test statistic.    ​(Round to two decimal places as​ needed.) Determine the​ P-value.    ​(Round to three decimal places as​ needed.) State the final conclusion that addresses the original claim.   ▼   Reject Fail to reject H0. There is ▼   sufficient not sufficient evidence to conclude that the mean of the population of pulse rates for adult females is ▼   not less than greater than 70 bpm.

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A random sample of 663 teens who said they did not typically eat fast food reported an average daily calorie intake of 2258, with standard deviation 1519. A random sample of 413 teens who said they did typically eat fast food reported an average daily calorie intake of 2637, with standard deviation 1138. The two populations are not terribly skewed. Based on the above description, which of the following conditions are met for conducting a hypothesis test for the equality of two means? Choose one or more that apply. Select one or more: a. Both samples are random b. Samples are independent of one another c. Both samples are normal enough given the sample size d. Two population means need to be the same

Source : www.bartleby.com

## 9.2 stats hw Flashcards

Start studying 9.2 stats hw. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

## 9.2 stats hw

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The plant manager of a company that makes pillows claims that only 8 percent of the pillows made have a stitching defect. The quality control director thought that the percent might be different from 8 percent and selected a random sample of pillows to test. The director tested the hypotheses H_0:p=0.08H0​:p=0.08 versus H_a:p\ne0.08Ha​:p​=0.08 at the significance level of \alpha=0.08α=0.08 .The p-value of the test was 0.03. Assuming all conditions for inference were met, which of the following is the correct conclusion?

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The pp-value is less than \alphaα, and the null hypothesis is rejected. There is convincing evidence to suggest the true proportion of stitching defects is not 0.08.

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A national health study reported that the proportion of students with elevated blood pressure is 0.15. The principal of a local high school believes that the proportion of students in the school with elevated blood pressure is greater than 0.15. If a large random sample is used, which of the following is the most appropriate test to investigate the principal's belief?

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A z-test for a proportion

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### Terms in this set (30)

The plant manager of a company that makes pillows claims that only 8 percent of the pillows made have a stitching defect. The quality control director thought that the percent might be different from 8 percent and selected a random sample of pillows to test. The director tested the hypotheses H_0:p=0.08H0​:p=0.08 versus H_a:p\ne0.08Ha​:p​=0.08 at the significance level of \alpha=0.08α=0.08 .The p-value of the test was 0.03. Assuming all conditions for inference were met, which of the following is the correct conclusion?

The pp-value is less than \alphaα, and the null hypothesis is rejected. There is convincing evidence to suggest the true proportion of stitching defects is not 0.08.

A national health study reported that the proportion of students with elevated blood pressure is 0.15. The principal of a local high school believes that the proportion of students in the school with elevated blood pressure is greater than 0.15. If a large random sample is used, which of the following is the most appropriate test to investigate the principal's belief?

A z-test for a proportion

A significance test is conducted for which the alternative hypothesis states that more than 85 percent of adult sea turtles on a certain beach are female. The pp-value for the test is 0.4158. If the null hypothesis is true, which of the following statements is a correct interpretation of the pp-value?

Of all possible samples of the same size, 41.58 percent will result in 85 percent or more of adult sea turtles on the beach being female.

A random sample of residents in city J were surveyed about whether they supported raising taxes to increase bus service for the city. From the results, a 95 percent confidence interval was constructed to estimate the proportion of people in the city who support the increase. The interval was (0.46, 0.52).

Based on the confidence interval, which of the following claims is supported?

More than 40 percent of the residents support the increase.

The pulse rate for each person in a sample of 20 men and 20 women was recorded. The boxplots below summarize the pulse rates for the men and the women in the sample.

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After a tropical storm in a certain state, news reports indicated that 19 percent of households in the state lost power during the storm. A state engineer believes that estimate is too low. The engineer will collect data to perform a hypothesis test on the proportion of all households without power. Which of the following are the appropriate hypotheses for such a test?

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A survey of a random sample of 1,045 young adults found that 60 percent do not have a landline telephone number. A hypothesis test will be used to determine whether the data provide convincing statistical evidence that more than 50 percent of all young adults do not have a landline telephone number. Which of the following is the test statistic for the appropriate test?

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For a school fund-raiser, 600 raffle tickets were sold by students at the school, of which 88 were sold by one student, Audrey. Of the 600 tickets sold, 30 were randomly selected to receive prizes, and 7 of the 30 tickets selected were tickets sold by Audrey. To investigate how likely it was by chance alone that at least 7 of the 30 selected tickets could have been sold by Audrey, students in a statistics class ran a simulation. One trial of the simulation is described by the following steps.

Step 1: From 600 chips, assign 88 red and the rest blue.

Step 2: Select 30 chips at random without replacement.

Step 3: Record the number of red chips in the selection of 30.

The results of 1,000 trials of the simulation are shown in the histogram.

Based on the results of the simulation, is there convincing statistical evidence at the significance level of 0.05 that the event of Audrey selling at least 7 of the 30 selected tickets is unlikely to have occurred by chance alone?

Source : quizlet.com

## Keeping sea turtles in the dark

Selling darkness in the Sunshine State can be tough. Florida’s beach communities sparkle at night with homes and condominiums decked out with beautiful lighting systems. Beachside resorts and businesses depend on artificial lighting to ensure safety and entertainment for guests and customers at night.

Image

## Keeping sea turtles in the dark

Gulf Environmental Benefit Fund boosts efforts to cut light pollution along Florida's nesting beaches

Selling darkness in the Sunshine State can be tough.

Florida’s beach communities sparkle at night with homes and condominiums decked out with beautiful lighting systems. Beachside resorts and businesses depend on artificial lighting to ensure safety and entertainment for guests and customers at night.

Wherever people live, work and play, nighttime lights follow. For decades, steadily increasing illumination along Florida’s coasts has wreaked havoc on sea turtles, which rely on subtle, nighttime lighting cues to deposit eggs on beaches and make it safely to sea as hatchlings.

By the early 1990s, Floridians committed to turtle conservation understood how tenuous the situation had become. Suzi Fox, director of the Anna Maria Island Turtle Watch, remembers the bad days on her island community on the Gulf of Mexico just south of Tampa.

“There wasn’t one half-block area in 7 miles where you could release a hatchling and have it go to the sea,” Fox said. “We didn’t have any lighting ordinances back then, and people just didn’t want to turn off their lights.

Throughout the 1990s and early 2000s, Fox and her fellow turtle conservationists chipped away at light pollution in Florida, which hosts more than 90 percent of all sea turtle nesting in the continental United States. Local governments began adopting turtle-friendly lighting ordinances, and conservation projects – many funded by the National Fish and Wildlife Foundation (NFWF) – helped focus efforts along high-density nesting sites.

On Anna Maria Island, Fox and her group were making progress – until 2010, when the disastrous Deepwater Horizon oil spill threatened to wipe out everything they had been working toward.

“I’ve been doing sea turtle work for 30 years, and that 2010 spill dropped the bottom out of my world,” Fox said. “But I’ll tell you what – there has been a little silver lining, and it has really blossomed into something bigger.”

That silver lining emerged in the years following the spill, when sea turtle conservation groups in Florida began tapping into unprecedented conservation resources offered by NFWF, first through its Recovered Oil Fund for Wildlife and more recently though its Gulf Environmental Benefit Fund (GEBF).

For Anna Maria Island’s sea turtles, Fox said, the difference sparked by NFWF funding “has been night and day.”

“Before that first round of funding,” Fox said, “there would be 10 disorientations in front of just one resort. Practically all of the hatchlings would go backward, year after year. They’d all wind up in a pool or out into the road and run over by cars.

“In the first year after those first projects – nothing. Everything went into the sea.”

Residents along Florida’s Gulf Coast seem to have come around, too, Fox said.

“People are learning how good it feels to do something for wildlife. They can see the difference these lighting projects makes for turtle nesting, and they can see that properties are still safe, well-lit and even more attractive at night. Just last night we had people out on the beach watching meteor showers, really enjoying the beauty of a dark beach. For many of them, it’s like they’ve come back to a place they knew and enjoyed as a child – before all the development – and they want that for their children and grandchildren, too.”

Armed with GEBF funding and the knowledge gained in such early projects, turtle experts are now steadily moving along Florida’s Panhandle, expanding the darkness as they go.

Sea turtles face threats to their survival from the moment they hatch out of their sandy nests to the ends of their often long lives.

Hatchlings that survive a gauntlet of land-, air- and sea-based predators must still contend with man-made threats. Fishing bycatch, loss of nesting habitat to development, boat strikes and even direct consumption of turtle meat and eggs have taken a heavy toll. Today, almost all sea turtles found in U.S. waters are federally listed as endangered; the loggerhead is listed as threatened.

Of all the man-made threats to sea turtles, artificial lighting near nesting beaches may be the most widespread and onerous, affecting both nesting females and legions of hatchlings.

“The exact number of hatchlings who are disoriented and die every year in Florida is unknown, but it’s probably well over 100,000,” said David Godfrey, executive director of the Florida-based Sea Turtle Conservancy. “When they pop out of an egg in a dark nest, their very first instinctive drive is to make it to the water and swim out as far as they can. In that moment, they’re relying a little bit on the slope of the beach – they instinctively know to go downward – but they’re relying even more on light. The visual cue they would typically use, the horizon out over the ocean, is always just a bit brighter, because of starlight and moonlight.”

Even a single bright light near a nesting site can cause all of the hatchlings on a given beach, or most of them, to head inland, Godfrey said.

Source : www.nfwf.org

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James 11 month ago

Guys, does anyone know the answer?