The prices of a random sample of the same textbooks from two colleges are in the table. Assume that the population distribution of differences is approximately Normal, and assume that the sampling was random. Each book was priced separately; there were no books "bundled" together. Test, using a = 0.05, that the mean price of textbooks at College A is different from the mean price of textbooks at College A. Then calculate a 95% confidence interval for the mean difference in price of the books at college A and college B. College A College B 67 79 84 82 66 69 87 82 71 83 52 66 59 66 53 48 88 92 43 45 93 106 52 60 80 96 63 70 49 52

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.