Question

A
11
12
7
12
11
15
6
16
12
13
9
14
11
10
8
15
14
13
9
6
8
12
14
16
11

We want to test to see whether the data taken from 25 test experiments is consistent with the mean equal to 10.3 (µ = 10.3), or is more consistent with the mean greater than 10.3 (µ > 10.3).

Use Summary 5b, Table 2, Column 1.

1. What is the null hypothesis H_o for our test?
2. What is the alternative hypothesis H_a?
3. What type of tail test will we use? (left tail, right tail, or two tails)?
4. What is the mean of the sample xbar?
5. What is the standard deviation of the sample s?
6. What is the size of the sample n?
7. We going to use a t-statistic. Explain why we are not going to use a z-statistic.
8. Calculate the t-statistic using xbar, µ, n, and s.
9. How many degrees of freedom does this data set have?
10. Use the t-distribution calculator to compute a p-value. Include a screen shot of your answer.

11. We want a 99% confidence level. Based on your value of p, should we accept or reject the null hypothesis?

12. What if we want a 95% confidence level? Based on your value of p, should we accept or reject the null hypothesis?

Answer 1