In 2018, the commute times to work in Horry county had a mean of 22.3 minutės. Suppose that the distribution of these commute times is symmetric and bell-shaped with a standard deviation of 1 minute. The middle 95% of commute times to work in Horry county (2018) would fall between approximately Select one: a. 19.3 and 25.3 minutes b. 20.3 and 24.3 minutes C. 21.3 and 23.3 minutes d. 22.1 and 22.5 minutes

On average, a banana will last 6.3 days from the time it is purchased in the store to the time it is too rotten to eat. The standard deviation is 2.1 days. Will the average banana spoil earlier if the banana is hung from the ceiling? The data show results of an experiment with 16 bananas that are hung from the ceiling. Assume that that distribution of the population is normal. 5, 8, 5, 7, 4, 4, 6, 8, 6, 7, 5, 7, 6, 3, 6,2 What can be concluded at the 0.10 level of significance? H0:  = 6.3 Ha: [ Select ] [">", "<", "Not Equal To"] 6.3 Test statistic:[ Select ]  ["T", "Z"]            p-Value = [ Select ] ["0.02", "0.08", "0.04", "0.16"]            [ Select ]  ["Reject Ho", "Fail to Reject Ho"]            Conclusion: There is [ Select ] ["insufficient", "statistically significant"]          evidence to make the conclusion that the population mean time that it takes for bananas to spoil if they are hung from the ceiling is less than 6.3 days.

Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard deviation of 8 minutes. complete the following statement: only 20% of the individuals wait less than -------- minutes.

Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours. A random sample of 28 commercial airline pilots was interviewed, and the pilots in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by pilots, with these times measured in hours after midnight. (Thus, if the pilot reported going to sleep at p.m., the measurement was -1.) The sample mean was 0.8 hours, and the standard deviation was 1.6 hours. Assume that the sample is drawn from a normally distributed population. Find a 90% confidence interval for the population standard deviation, that is, the standard deviation of the time (hours after midnight) at which pilots go to sleep on their work days. Then give its lower limit and upper limit.

Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 24 days and a standard deviation of 6 days.  80% of all trials of this type are completed within how many days?

Item 19 Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 33 minutes and a standard deviation of 8 minutes, while method B has a mean of 37 minutes and a standard deviation of 4.0 minutes. (a) Which procedure is preferred if the procedure must be completed within 34 minutes? multiple choice 1 Method A Method B Either Method  (b) Which procedure is preferred if the procedure must be completed within 45.0 minutes? multiple choice 2 Method A Method B Either Method  (c) Which procedure is preferred if the procedure must be completed within 41 minutes? multiple choice 3 Method A Method B Either Method

Assume the hold time of callers to a cable company is normally distributed with a mean of 4.2 minutes and a standard deviation of 0.9 minute. Determine the percent of callers who are on hold between 2.7 minutes and 5.9 minutes.

Suppose that one-way commute times in a particular city are normally distributed with a mean of 15.94 minutes and a standard deviation of 1.232 minutes. Would it be unusual for a commute time to be above 20.2 minutes?