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Prof. SoftTouch gave three exams last semester. Scores were normally distributed on each exam. Below are scores for 10 randomly chosen students on each exam. (a) Find the 95 percent confidence interval for the mean score on each exam. (b) Do the confidence intervals overlap? What inference might you draw by comparing the three confidence intervals?
The standard deviation is the most useful measure of variation in a set of data because it tells us a. the difference between the highest and lowest scores in the set. b. the extent to which the sample being used deviates from the bigger population it represents. c. how much individual scores differ from the mode. d. how much individual scores differ from the mean.
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