question 1

In a poll of 225 randomly selected U.S. adults, 112 said they favored a new proposition. Based on this poll, compute a 95% confidence interval for the proportion of all U.S. adults in favor of the proposition (at the time of the poll). Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.) Lower limit: E X 5 ? Upper limit:In a random sample of 250 students at a university, 210 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.) Lower limit: X 5 ?we want to conduct a hypothesis test of the claim that the population mean germination time of strawberry seeds is different from 18.1 days. So, we choose a random sample of strawberries. The sample has a mean of 18 days and a standard deviation of 1.5 days. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places. (a) The sample has size 95, and it is from a nonnormally distributed population with a known standard deviation of 1.1. oz: O f = Q It is unclear which test statistic to use. (b) The sample has size 16, and it is from a normally distributed population with an unknown standard deviation. oz: O f = Q It is unclear which test statistic to use. We want to conduct a hypothesis test of the claim that the population mean score on a nationwide examination in biology is different from 484. So, we choose a random sample of exam scores. The sample has a mean of 485 and a standard deviation of 74. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places. (a) The sample has size 19, and it is from a normally distributed population with an unknown standard deviation. Oz: Of: 0 It is unclear which test statistic to use. (b) The sample has size 20, and it is from a normally distributed population with a known standard deviation of 76. Oz: O I = Q It is unclear which test statistic to use