Assuming a null hypothesis of no preference, what is the expected frequency for all types of drinks?
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- 29 percent of all Samsung cell phones are submitted for service while under warranty. Of these, 66 percent can be repaired, whereas the other 34 percent must be replaced with new units. If a company purchases 12 Samsung cell phones, what is the probability that exactly 2 will end up being replaced under warranty? What would the mean number of cell phones being replaced under warranty be? What would be the variance be for the cell phones being replaced by warranty?.A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 25 adult Americans and asks them whether or not support the proposed changes . To say that the distribution of the sample proportion of adults who respond yes, is approximately normal , how many more adult Americans does the researcher need to sample in the following cases? (a) 15% of all adult Americans support the changes (b) 20% of all adult Americans support the changesDoes stretching before exercise reduce the chance of injury? To answer this question, a random sample of 800 athletes was selected and split into two groups based on stretching preference. Of the 450 who do not stretch prior to exercise, 231 suffered an injury during the previous year. Of the 350 who stretch prior to exercise, 55 suffered an injury during the previous year. Is there enough evidence to conclude that stretching prior to exercise reduces the chance of injury based on these data? Calculate the test statistic. You must show your work for full credit.
- A report states that 10% of all babies born in a certain U.S. state are preterm, which has important implications for the cost of health care. If in an SRS of 400 recent births in the state 36 were preterm, what is sampling distribution of the sample proportion? approximately N(0.10, 0.0150) approximately N(40, 6) binomial with n=400 and p=.10A candy company claims that the candy colors (red, purple, green, blue, and yellow) appear in the same proportion in their candy bags. Fill in the table with the expected numbers for each color for a sample of 400 candies if the claim is true. Color Purple Expected number in sample Red Color Expected number in sample Red Green An independent analyst claims that 21% are red, 15% are purple, 35% are green, 10% are blue, and 19% are yellow. Fill in the table with the expected numbers for each color for a sample of 400 candies if this claim is true. Purple Blue Green Yellow Blue YellowDoes stretching before exercise reduce the chance of injury? To answer this question, a random sample of 800 athletes was selected and split into two groups based on stretching preference. Of the 450 who do not stretch prior to exercise, 231 suffered an injury during the previous year. Of the 350 who stretch prior to exercise, 55 suffered an injury during the previous year. Is there enough evidence to conclude that stretching prior to exercise reduces the chance of injury based on these data? Find and interpret the p-value.
- When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 20% of the eggs are yellow, and the rest green. Next spring the lead scientist has permission to randomly select 67 of the dragon eggs to incubate. Consider all the possible samples of 67 dragon eggs. What is the mean number of yellow eggs in samples of 67 eggs? (that is the same as asking for the expected value of the number of yellow eggs) (Give answer correct to at least one decimal place.) mean = What is the standard deviation in the number of yellow eggs in samples of size 67? (Give answer correct to at least one decimal place.) standard deviation = What is the variance in the number of yellow eggs in samples of size 67? (Remember to calculate the answer using at least 5 decimal places, then give answer correct to at least one decimal place.) variance =When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 30% of the eggs are yellow, and the rest green. Next spring the lead scientist has permission to randomly select 46 of the dragon eggs to incubate. Consider all the possible samples of 46 dragon eggs. What is the mean number of yellow eggs in samples of 46 eggs? (that is the same as asking for the expected value of the number of yellow eggs) (Give answer correct to at least one decimal place.) mean = What is the standard deviation in the number of yellow eggs in samples of size 46? (Give answer correct to at least one decimal place.) standard deviation = What is the variance in the number of yellow eggs in samples of size 46? (Remember to calculate the answer using at least 5 decimal places, then give answer correct to at least one decimal place.) variance =Is there an association between dominant hand (right or left) and pet preference (dog, cat, other, none) in college students? A local professor selects a random sample of 114 students from his college and categorizes them appropriately. He would like to determine if there is convincing evidence of an association. Let a = 0.05. What are the hypotheses for this test? Họ: There is no association between dominant hand (right or left) and pet preference (dog, cat, other, none) in college students. Hạ: There is an association between dominant hand (right or left) and pet preference (dog, cat, other, none) in college students. O Họ: There is an association between dominant hand (right or left) and pet preference (dog, cat, other, none) in college students. Hạ: There is no association between dominant hand (right or left) and pet preference (dog, cat, other, none) in college students. Họ: There is a difference in the distribution of dominant hand (right or left) and pet preference (dog, cat,…
- Suppose that, in a comparison of two holiday companies’ customers, of the 75 who went with Happy Days Tours, 45 said they were satisfied, while 48 of the 90 who went with Fly by Night Holidays were satisfied. Test at a 2.5% significance level whether there is a difference in the true proportion of satisfied customers for the two companies?When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 34% of the eggs are yellow, and the rest green. Next spring the lead scientist has permission to randomly select 51 of the dragon eggs to incubate. Consider all the possible samples of 51 dragon eggs.What is the mean number of yellow eggs in samples of 51 eggs? (that is the same as asking for the expected value of the number of yellow eggs)(Give answer correct to at least one decimal place.)mean = What is the standard deviation in the number of yellow eggs in samples of size 51?(Give answer correct to at least one decimal place.)standard deviation = What is the variance in the number of yellow eggs in samples of size 51?(Remember to calculate the answer using at least 5 decimal places, then give answer correct to at least one decimal place.)variance =When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 37% of the eggs are yellow, and the rest green. Next spring the lead scientist has permission to randomly select 67 of the dragon eggs to incubate. Consider all the possible samples of 67 dragon eggs. What is the mean number of yellow eggs in samples of 67 eggs? (that is the same as asking for the expected value of the number of yellow eggs) (Give answer correct to at least one decimal place.) mean = What is the standard deviation in the number of yellow eggs in samples of size 67? (Give answer correct to at least one decimal place.) standard deviation = What is the variance in the number of yellow eggs in samples of size 67? (Remember to calculate the answer using at least 5 decimal places, then give answer correct to at least one decimal place.) variance =
