The data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three tellerwindows. Test 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 waung 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. m Click on the icon to view the data. that the are a. Identify the null and alternative hypotheses. Choose the correct answer below. A. Hg: o-24 minutes HA o<24 minutes OB. Ho o24 minutes HAo<24 minutes c. Ho: a 24 minutes HA O24 minutes OD. H: a<2.4 minutes HA 24 minutes b. Compute the test statistic (Round to two decimal places as needed.)

To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a safety engineer conducts braking tests for 35 models of Make A and 35 models of Make B. The mean braking distance for Make A is 42 feet. Assume the population standard deviation is 4.7 feet. The mean braking distance for Make B is 45 feet. Assume the population standard deviation is 4.4 feet. At a = 0.10, can the engineer support the claim that the mean braking distances are different for the two makes of automobiles? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) rari rz (b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are (Round to three decimal places as needed. Use a comma to separate answers as needed.)

With a mean of 10 and standard deviation of 5. Assume that the population data are normally distributed.  Calculate the z-score for a raw score of 5. What proportion of the distribution is equal to or less than this score?

For a certain type of computers, the length of time between charges of the battery is normally distributed with a mean of 62 hours and a standard deviation of 11 hours. John owns one of these computers and wants to know the number of hours when the computer would have 12%  of its battery life left. Sketch the region in question. Write a sentence describing what your answer represents about the problem's specefics.