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Keisha was doing research on the disciplinary infractions of North Carolina inmates. She took a random sample of 9 inmates and found that their mean number of disciplinary infractions was 2.78, with a standard deviation of 2.22.
a. Calculate the 95% confidence interval for the data provided above.
Note: You must show your work
b. Interpret the results of your calculation
c. Let's say the sample had 120 cases. How would the results change? Why?
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