The data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than 2.4 minutes, which is the standard deviation of waiting times at the same bank when separate waiting lines are used at each teller window. Use a significance level of 0.01. Assume that the sample is a simple random sample selected from a normally distributed population. Complete parts (a) through (d) below. Click on the icon to view the data. 14 (...) a. Identify the null and alternative hypotheses. Choose the correct answer below. OA. Ho: o=2.4 minutes HA: #2.4 minutes OC. Ho: o=2.4 minutes HA: <2.4 minutes OB. Ho: <2.4 minutes HA: 0=2.4 minutes OD. Ho: 022.4 minutes HA: <2.4 minutes b. Compute the test statistic. x² = 0 (Round to two decimal places as needed.) c. Find the P-value of the test statistic. The P-value of the test statistic is. (Round to three decimal places as needed.) d. Does the use of the single line appear to reduce the variation among waiting times? There is sufficient evidence to conclude that the single line reduced the variation among waiting times because Ho is not rejected by the hypothesis test. Cúplat Next ke PREMIUM AWING PA

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