The mean percent increase in this sample is:   a. 13.5%.   b. 14.2%.   c. 12.2%.   d. 11.8%.   If the confidence level is deccreased from 90% to 88% for an SRS of size n, the width of the confidence interval for the mean  will:   a. decrease.   b. stay the same.   c. increase.   d. The answer cannot be determined from the information given

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