9 The Department Of Transportation Would Like To Test The Hypothesis That The Average Age Of Cars On The Road Is Less T 1 (135.79 KiB) Viewed 27 times
9. The Department of Transportation would like to test the hypothesis that the average age of cars on the road is less than 10 years. A random sample of 50 cars had an average age of 9.5 years. It is believed that the population standard deviation for the age of cars is 3.4 years. The Department of Transportation would like to set a = 0.10. The conclusion for this hypothesis test would be that because the test statistic is Question options: A) more than the critical value, we can conclude that the average age of cars on the road is less than 10 years. B) more than the critical value, we cannot conclude that the average age of cars on the road is less than 10 years. C) less than the critical value, we can conclude that the average age of cars on the road is less than 10 years. 10. YouTube would like to test the hypothesis that the average length of an online video watched by a user is more than 6 minutes. A random sample of 40 people watched online videos that averaged 6.6 minutes in length. It is believed that the population standard deviation for the length of online videos is 1.7 minutes. YouTube would like to set a = 0.05. Which one of the following statements is true? Question options: A) Because the p-value is greater than a, we reject the null hypothesis and conclude that the average length of an online video is more than 6 minutes. B)Because the p-value is greater than a, we fail to reject the null hypothesis and conclude that the average length of an online video is less than 6 minutes. C) Because the p-value is less than a, we fail to reject the null hypothesis and conclude that the average length of an online video is less than 6 minutes. D) Because the p-value is less than a, we reject the null hypothesis and conclude that the average length of an online video is more than 6 minutes.
12. Medicare would like to test the hypothesis that the average monthly rate for one-bedroom assisted-living facility is equal to $3,300. A random sample of 12 assisted-living facilities had an average rate of $3,690 per month. The standard deviation for this sample was $530. Medicare would like to set a = 0.05. The conclusion for this hypothesis test would be that because the absolute value of the test statistic is Question options: A) more than the absolute value of the critical value, we can conclude that the average monthly rate for an assisted-living facility is not equal to $3,300. B) less than the absolute value of the critical value, we can conclude that the average monthly rate for an assisted-living facility is not equal to $3,300. C) more than the absolute value of the critical value, we cannot conclude that the average monthly rate for an assisted-living facility is not equal to $3,300. D) less than the absolute value of the critical value, we cannot conclude that the average monthly rate for an assisted-living facility is not equal to $3,300.
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