Question

In: Statistics and Probability

Waiting time for checkout line at two stores of a supermarket chain were measured for a...

  1. Waiting time for checkout line at two stores of a supermarket chain were measured for a random sample of customers at each store. The chain wants to use this data to test the research (alternative) hypothesis that the mean waiting time for checkout at Store 1 is lower than that of Store 2. (12 points)

Store 1 (in Seconds)

Store 2 (in Seconds)

470

375

394

319

167

266

293

324

187

244

115

178

195

279

400

289

228

342

315

212

195

188

  1. What are the null and alternative hypothesis for this research?
  2. What are the sample mean waiting time for checkout line and the sample standard deviation for the two stores?
  3. Compute the test statistic t used to test the hypothesis. Note that the population standard deviations are not known and therefore you cannot use the formula in Section 10.1. Use the one in Section 10.2 instead.
  4. Compute the degree of freedom for the test statistic t.
  5. Can the chain conclude that the mean waiting time for checkout at Store 1 is lower than that of Store 2? Use the critical-value approach and α = 0.05 to conduct the hypothesis test.
  6. Construct a 95% confidence interval for the difference of mean waiting time for checkout line at the two stores.

Solutions

Expert Solution

population mean waiting of store 1

population mean waiting of store 2

sample mean waiting time and standard deviation of store 1

Sample mean wait time and standard deviation of store 2

We conclude that there is not enough evidence to support that the mean waiting time for checkout at Store 1 is lower than that of Store 2.

95% Confidence interval

PL??


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