A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups as they could. The 10 randomly selected students averaged 15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the population of number of pushups that can be done is approximately normal. The 95% confidence interval for the true mean number of pushups that can be done is
A)5.75 to 24.25.
B)8.56 to 21.40.
C)11.31 to 18.55.
D)13.02 to 16.98.

Question

A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups as they could. The 10 randomly selected students averaged 15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the population of number of pushups that can be done is approximately normal. The 95% confidence interval for the true mean number of pushups that can be done is ​
A)5.75 to 24.25.
B)8.56 to 21.40.
C)11.31 to 18.55.
D)13.02 to 16.98.

Quizplus · Accepted Answer

The Answer of A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups as they could. The 10 randomly selected students averaged 15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the population of number of pushups that can be done is approximately normal. The 95% confidence interval for the true mean number of pushups that can be done is ​
A)5.75 to 24.25.
B)8.56 to 21.40.
C)11.31 to 18.55.
D)13.02 to 16.98.

A Statistics Teacher Started Class One Day by Drawing the Names