14 fu E F Formulas С D Hypothesis Test about a Population Mean: Sigma Known Case Sample Size: Sample Mean Hypothesized Mean Value Population Standard Deviation #N/A #N/A WNOWN 15 4.1 0.01 А B Call Time (minutes) 2 20.3 3 13.7 16.2 18.1 6 13.7 17.3 14.6 174 10 18.5 11 10.2 12 15.1 13 16.6 14 17 15 14.5 16 20.1 17 11.3 18 16.3 19 20.5 20 21.7 21 15.6 22 12.2 23 18.5 24 25.9 25 14.5 26 21.6 27 15.6 28 15.9 29 14.7 30 17.6 WNA WNA WNA Level of Significance Standard Error Critical Value Test Statistic (2) p-value (Lower Tall) P-value (Upper Tail) p-value (Two Tall) Roject Null Hypothesis? Data range AA #N/A #N/A WNIA #N/A
< ♡ Arial 10 В Шулу А. ab E 4 X fx A С D Data range A:A 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 B 18.5 25.9 14.5 21.6 15.6 15.9 14.7 17.6 18 16.7 11.6 16,8 13 13.2 +
Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys can be completed in a mean time of 15 minutes or less. If a longer mean survey time is necessary, a premium rate is charged. Suppose a sample of 35 surveys produces the data in the Microsoft Excel Online file below. Use a known o = 4,1 minutes. Is the premium rate justified? 1111 Open spreadsheet a. Formulate the null and alternative hypotheses for this application. Ho less than or equal to 15 Ha greater than 15 b. Compute the value of the test statistic (to 2 decimals) c. What is the p-value (to 4 decimals)? d. Using a = .01, is a premium rate justified for this client? No Check My Work Reset Problem
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