ooo TMobile LTE 1041 AM coursesapexlearningcom tistical Anal

ooo T-Mobile LTE 10:41 AM courses.apexlearning.com tistical Analysis SUBMIT Question 9 of 25 Multiple Choice: Please select the best answer and click \"submit. Suppose that a company claims that its air fresheners last 21 days, on average. You take many large samples, and find, each time, that the mean number of days of the sample is outside the 95% confidence interval. Based on this information alone, which of the following is probably not the mean number of days that the company\'s air fresheners last? O A 21 O B. 15 O c. 19

Solution

the company claims that its air freshners last 21 days, on average.

for sample data the observation is that the mean number of days of the sample is outside the 95% confidence interval.

now the 95% confidence interval with respect to 21 should contain the point 21 in case of large samples.

but for the samples the mean number of days of the sample is outside the 95% confidence interval.

so the samples does not have mean number of days to be 21.

so based on this information 21 can not be the mean number of days that the company\'s air freshner lasts

so the answer is option A [answer]