Exam 13: Violence and Unintentional Injuries

YouTube would like to test the hypothesis that the standard deviation for the length of an online video watched by a user is more than 2 minutes. A random sample of 21 people who watched online videos was selected. The sample standard deviation for the length of the video was found to be 2.5 minutes. The test statistic for this hypothesis test would be _____.

A retail chain would like to test if a difference exists between the variability of customer satisfaction scores from two locations. The following data represents satisfaction scores from a random sample of customers from these locations on a scale of 1- 20. Location 1 12 14 20 18 15 17 16 Location 2 18 19 17 18 16 20 Using ?=0.10, the critical value for this hypothesis test would be _____

Entertainment Software Association would like to test if the standard deviation for the age of "gamers" (those that routinely play video games)is equal to 6.0 years. The standard deviation for the age from a random sample of 24 gamers is 3.8 years. The test statistic for this hypothesis test would be ______.

A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. A random sample of 15 students was selected and the sample standard deviation for the time needed to complete the exam was found to be 4.0 minutes. Using α = 0.05, the conclusion for this hypothesis test would be that because the test statistic is

Medicare would like to test the hypothesis that the standard deviation for the monthly rate for a one- bedroom assisted- living facility is more than $400. A random sample of 17 assisted living facilities had a standard deviation of $530. The degrees of freedom for this hypothesis test would be _____.

The test statistic that is used to compare the variances of two populations follows the chi- square distribution.

A golfer would like to test the hypothesis that the variance of his golf score equals 10.0. The correct hypothesis statement would be .

A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. The correct hypothesis statement would be _.

Entertainment Software Association would like to test if the standard deviation for the age of "gamers" (those that routinely play video games)is equal to 6.0 years. The standard deviation for the age from a random sample of 24 gamers is 3.8 years. The degrees of freedom for this hypothesis test would be ________.

A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. A random sample of 15 students was selected and the sample standard deviation for the time needed to complete the exam was found to be 4.0 minutes. The degrees of freedom for this hypothesis test would be ______.

The degrees of freedom for the critical value for a hypothesis test for a single population variance is n - 2.

Entertainment Software Association would like to test if the standard deviation for the age of "gamers" (those that routinely play video games)is equal to 6.0 years. The standard deviation for the age from a random sample of 24 gamers is 3.8 years. Using α = 0.05, the lower critical value for this hypothesis test would be ______.

A golfer would like to test the hypothesis that the variance of his golf score equals 10.0. A random sample of 28 rounds of golf had a sample standard deviation of 3.5. Using α = 0.10, the lower critical value for this hypothesis test would be ______.