B

The technology committee has stated that the average time spent by students per lab visit has increased, and the increase Time supports the need for increased lab fees. To substantiate this claim, the committee randomly samples 12 student lab visits and 51 52 notes the amount of time spent using the computer. The times in minutes are shown in the table to the right, Complete parts a and 61 73 b. 50 70 72 124 53 11 64 70 . . .. . O B. The histogram shows that there is one extreme outlier. Since the sample size is large enough, the conditions for inference are okay. C. The histogram shows two extreme outliers. With these values included, the conditions for inference are violated. b) The previous mean amount of time spent using the lab computer was 55 minutes. Find a 90% confidence interval for the true mean. What do you co about the claim? If there are outliers, find intervals with and without the outliers present. Find the confidence interval using all of the data. The confidence interval is ( D (Round to two decimal places as needed.)