e any of the observations outliers? Explain. O A. The histogram shows that there are no outliers. The conditions for inference are satisfied. O B. The histogram shows that there is one extreme outlier. Since the sample size slarge enough, the conditions for inference are okay. C. The histogram shows two extreme outliers. With these values included, the conditions for inference are violated. The previous mean amount of time spent using the lab computer was 54 minutes. Find a 90% confidence interval for the true mean. What do you conclude about the claim? If there are outliers, find intervals with and without the outliers esent. nd the confidence interval using all of the data.

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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The technology committee has stated that the average time spent by students per lab visit has increased, and the increase supports the need for increased lab fees. To substantiate this claim, the
committee randomly samples 12 student lab visits and 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 b.
Time
74
134
53
10
71
51
70
60
62
52
68
54
Are any of the observations outliers? Explain.
O A. The histogram shows that there are no outliers. The conditions for inference are satisfied.
O B. The histogram shows that there is one extreme outlier. Since the sample size is large enough, the conditions for inference are okay.
Vc. 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 54 minutes. Find a 90% confidence interval for the true mean. What do you conclude 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 ( 48.78, 80.98).
(Round to two decimal places as needed.)
If outliers are present, find the confidence interval without the outliers. Select the correct choice below and, if necessary, fill in the answer boxes within your choice.
O A. The confidence interval is (| | D-
(Round to two decimal places as needed.)
O B. The data do not contain any outliers.
Transcribed Image Text:The technology committee has stated that the average time spent by students per lab visit has increased, and the increase supports the need for increased lab fees. To substantiate this claim, the committee randomly samples 12 student lab visits and 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 b. Time 74 134 53 10 71 51 70 60 62 52 68 54 Are any of the observations outliers? Explain. O A. The histogram shows that there are no outliers. The conditions for inference are satisfied. O B. The histogram shows that there is one extreme outlier. Since the sample size is large enough, the conditions for inference are okay. Vc. 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 54 minutes. Find a 90% confidence interval for the true mean. What do you conclude 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 ( 48.78, 80.98). (Round to two decimal places as needed.) If outliers are present, find the confidence interval without the outliers. Select the correct choice below and, if necessary, fill in the answer boxes within your choice. O A. The confidence interval is (| | D- (Round to two decimal places as needed.) O B. The data do not contain any outliers.
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