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(Don't include a dollar sign in your answer - report the number only.)Question 7 0 out of 5 pointsYou work for a large retailer with many locations across the country. You are asked to calculate a 99% confidence interval for the average daily sales across all of your locations. You are able to obtain data for 10 locations, for which the average sales are $85,441 with a standard deviation of 27,924.What is the lower bound of the confidence interval?(Round your answer to the nearest dollar.)
Question 8 0 out of 5 pointsAllergy DrugA company claims that 10% of the users of a certain allergy drug experience drowsiness. In clinical studies of this allergy drug, 81 of the 900 subjects experienced drowsiness.What is the 99% confidence interval for the population proportion of users who experience drowsiness?Question 9 5 out of 5 pointsIn a one-tail test, the p-value is found to be equal to 0.054. If the test had
been two-tail, then the p-value would have been 0.027.Question 10 0 out of 5 pointsWhich of the following conclusions is an appropriate conclusion from a hypothesis test?..Question 11 5 out of 5 pointsA p-value is a probability, and must be between 0 and 1.
Question 12 0 out of 5 pointsA professor of statistics refutes the claim that the average student spends 3 hours studying for the midterm exam. She is not sure if they spend moreor less than three hours, but she thinks that the average is not 3 hours. Which hypotheses are used to test the claim?Question 13 5 out of 5 pointsAttorneysSuppose that you want to test whether the population proportion of attorneys who make at least $400,000 per year is less than 0.24. A random sample of 200 attorneys shows that there are 36 of them who make at least $400,000 a year.What is your conclusion from a hypothesis test at a 10% significance level?
Question 14 5 out of 5 pointsYou are the owner of a local fast food restaurant and you want to test whether your average number of customers per day is less than 500. You take a sample of 25 days and find that the average for these days is 480. You have been told by the corporate office that the population standard deviation of the number of customers is 95.What is your conclusion from a hypothesis test at a 5% significance level?Question 15 5 out of 5 pointsSuppose you want to perform a two-tail test of the population mean when the population standard deviation is known. The null hypothesis will be
rejected at the 0.05 level of significance if the value of the standardized test statistic z is: