Solution step by step

The proportion of cell phone users with 4G contracts last year was 11: = 0.62. A Verizon executive thinks the proportion has increased this year. Suppose that from a random sample of 350 users, 238 have 4G contracts. Use alpha = 0.05 to test the claim of the executive. Calculate the test-statistic (2 decimal places - absolute value) Determine the p-value (round to 3 decimal places) Do you reject or not reject the null hypothesis? Bank Fees Part 1 (3) 0 Bank fees have come under scrutiny lately. Prior to the recession, fees charged by banks for late credit card payments averaged $ 40. A government agency would like to test the hypothesis that these fees now average more than $ 40. After 55 banks were randomly sampled, it was found that the average late fee is $ 45. Assume the population standard deviation for these late fees is $ 15.00. Follow the steps in the previous section to test the govemment's claim using alpha = 0.05. 0 Calculate the 2 test statistic (round to 2' decimal places) 0 Calculate the p-value round to 3 decimal places) 0 Do you reject or not reject the null hypothesis? Kellogg's (3) . Kellogg's has a process for filling boxes of Frosted Flakes cereal with 18 ounces of product when it is operating properly. Too much product in the box is wasteful to Kellogg's, whereas too little product can lead to customer complaints. To determine if the filling process is performing as it should, a random sample of 50 boxes was examined, and the average weight of a box was found to be 17.89 ounces. Historically, the filling process has a standard deviation of 0.20 ounces. Follow the six steps for conducting a two-tail hypothesis test to determine if the filling process is operating properly, using alpha = 0.01. Calculate the z test statistic (round to 2 decimal places) . Calculate the p-value (round to 4 decimal places). . Do you reject or not reject the null hypothesis?U.S. Post Office (3) The U.S. Post Office in Mobile, Alabama, has previously studied its service operations and has determined that the distribution of time required for a customer to be served is normally distributed, with a mean equal to 540 seconds. However, the manager overseeing all of Mobile's post offices has charged his staff with improving service times. Post Office officials have selected a random sample of 16 customers and wish to determine whether the mean service time is now fewer than 540 seconds. Use 0.01 level of significance to test this. The mean from the random sample is 510 seconds, the standard deviation is 45 seconds. . Find the critical value (3 decimal places - absolute value) . Calculate the test statistic (round to 4 decimal places). . Do you reject or not reject the null hypothesis