The past records of a supermarket show that its customers spend an average of $95 per visit at this store. Recently the management of the store initiated a promotional campaign according to which each customer receives points based on the total money spent at the store, and these points can be used to buy products at the store. The management expects that as a result of this campaign, the customers should be encouraged to spend more money at the store. To check whether this is true, the manager of the store took a sample of 14 customers who visited the store. The following data give the money (in dollars) spent by these customers at this supermarket during their visits.
Assume that the money spent by all customers at this supermarket has a normal distribution. Using a 5% significance level, can you conclude that the mean amount of money spent by all customers at this supermarket after the campaign was started is more than $95?
Answer to relevant QuestionsAccording to the Kaiser Family Foundation, U.S. workers who had employer-provided health insurance paid an average premium of $4129 for family health insurance coverage during 2011 (USA TODAY, October 10, 2011). Suppose a ...In each of the following cases, do you think the sample size is large enough to use the normal distribution to make a test of hypothesis about the population proportion? Explain why or why not. a. n = 40 and p = .11 b. n = ...Consider the null hypothesis H0: p = .25. Suppose a random sample of 400 observations is taken to perform this test about the population proportion. Using α = .01, show the rejection and non rejection regions and find the ...Write the null and alternative hypotheses for each of the following examples. Determine if each is a case of a two-tailed, a left-tailed, or a right-tailed test. a. To test if the mean number of hours spent working per week ...A study claims that 65% of students at all colleges and universities hold off-campus (part-time or fulltime) jobs. You want to check if the percentage of students at your school who hold off-campus jobs is different from ...
Post your question