Question

Graduate students in a statistics department recorded hours spent consulting on 21 different projects in a particular semester:

1 | 1 | 2 | 2 | 3 | 5 | 5 | 8 | 10 | 15 | 15 |

18 | 20 | 20 | 24 | 30 | 30 | 30 | 48 | 50 | 148 |

Report the width of the interval. (Round your answer to two decimal places.) interval: (8.49, 37.7)

Delete the value "148" from the data set. Report the width of the new interval.' interval (9.89, 23.82)

Answer #1

a)

The width of the confidence interval id the margin of error from mean,

From the data values,

The t critical value is obtained from t distribution table for significance level = 0.05 and degree of freedom = n -1 = 21 - 1 = 20.

b)

After deleting the data point = 148 from the data set,

Now,

The t critical value is obtained from t distribution table for significance level = 0.05 and degree of freedom = n -1 = 20 - 1 = 19.

Graduate students in a statistics department recorded hours
spent consulting on 21 different projects in a particular
semester:
1
1
2
2
3
5
5
8
10
15
15
18
20
20
24
30
30
30
48
50
148
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