Question

# Graduate students in a statistics department recorded hours spent consulting on 21 different projects in a...

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)

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.

#### Earn Coins

Coins can be redeemed for fabulous gifts.