Blog

In Chapter 9, we presented methods for (1) testing a claim made about ____ population proportions and (2) constructing a confidence interval estimate of the ____________between the two population proportions

For the statement the mean age of Taxi drivers in Miami is 68.9 years. Write the null and alternative hypotheses.

The mean age of Taxi drivers in Miami is 65.9 years. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

You wish to test the claim that μ ≠ 22 at a level of significance of α=0.05 and are given sample statistics n =35, x=21.1, and s =2.7. Compute the value of the standardized test statistic. Round your answer to two decimal places.

a. H0: μ = 873; Ha: μ ≠ 873 (claim)

Based on the results above, can we conclude that more than 95% of adults know twitter?

Find the critical value and rejection region for the type of z-test with level of significance α. Left-tailed test, α = 0.01

State the hypotheses. A laptop manufacturer claims that the mean life of battery for a certain model of laptop is more than 12 hours.

Google hires you to find how many people buy tutoring services online. How many adults need to be surveyed for 99% CL that sample is no more than 4% n= ((Z_(a/2)) ^2 (p)(q)/ (E)^2 or n= ((Z_(a/2)) ^2 (.25)/ (E)^2 Census reveals 75% use tutoring service online p= q= Z_(a/2) =

Find the critical value and rejection region for the type of z-test with level of significance α. Left-tailed test, α = 0.01