Texas A & M International University Confidence Intervals and Z Test Project PART 1
Confidence Intervals and Introduction to Hypothesis Testing
1) Calculate a 95% and 99% confidence interval for the following data set. Note: this is a sample. Show your steps including the mean, z-score, standard deviation, and standard error that you use.
22
20
28
26
16
10
9
18
8
12
20
30
31
28
19
14
14
17
11
13
2) In an experimental treatment, a random individual scores 49 on a measurement. People in general are normally distributed with a mean of 34 and a standard deviation of 6. The researcher predicts that the treatment will create an effect on the subject but does not specify if the measurement will increase or decrease. Using a 5% significance level (p
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