Confidence Intervals and Hypothesis Testing

When you are using technology to solve problems (excel), stick to criteria that when population standard deviation is known, normal distribution is used. In all other cases irrespective of sample sizes, t distribution is used.

So, consider variable overall satisfaction with the dining facility variable.

a. At 90% confidence, estimate the overall satisfaction with the dining facility.

b. At a 10% significance level, can we conclude overall satisfaction is different from 3.5? Explain criteria used to reach conclusion.

The data:

Overall satisfaction		1 = Very unsatisfied
4		2 = Somewhat unsatisfied
4		3 = Neither unsatisfied nor satisfied
3		4 = Somewhat satisfied
5		5 = Very satisfied
4
3
4
3
4
4
3
3
4
1
5
2
3
3
4
1
3
2
3
2
3
3
3
1
2
4
3
3
4
4
4
4
4
3
3
2
3
3
4
4
3
2
3
4
5
4
4
5
3
3
3
3
4
3
4
2
3
2