Q. 1 In the population, the average score on a test of self-esteem is 50 (σ= 5). You select a random sample of 25 students who score a mean of 53. a. Shine claims that these students don’t have very high self-esteem, because they are only 3 points above the population mean. Why can’t she make this claim merely by looking at the X? . b. What should she do? . c. What is the z-score for this sample? . d. What conclusion do you draw about your sample? .

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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.