Author: Anonymous

A survey analyst claims that more than 60% of adults prefer Brand A. A random sample of n = 400 adults gives p̂ = 0.64. Use α = 0.05. Give the final conclusion about the claim: supported or not supported. (answer with “supported” or “not supported”)

A claim involves p = 0.70. A sample of n = 200 gives p̂ = 0.63. What is the test statistic?

A manufacturer claims that the variance in fill volume is no more than 0.25 ounces. A random sample of n = 31 containers has sample variance s² = 0.32. Use α = 0.05. Give the final conclusion about the claim: supported or not supported. (answer with “supported” or “not supported”)

Which symbol represents a population proportion?

A claim containing “equal to” belongs in the alternative hypothesis.

A left-tail test has critical value -1.960 and TS = -1.750. What is the decision? (answer with “reject H0” or “fail to reject H0”)

A hypothesis test involves a population mean with n = 45. Which Excel function should be used for the critical value according to Module 6?

A left-tail chi-square test has critical value 8.907 and TS = 10.250. What is the decision? (answer with “reject H0” or “fail to reject H0”)

A sample has x̄ = 52, μ = 50, s = 8, and n = 64. What is the test statistic?

Write the missing complementary hypothesis exactly. Use mu for mean, p for proportion, sigma for std deviation, and sigma2 for variance. Use operators: =, , =, < or >. If H0: σ ≥ 5, then H1 is: