Are the calculus students better than average

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Reference no: EM131125440

Here is a sample of ACT scores (average of the Math, English, Social Science, and Natural Science scores) for students taking college freshman calculus:

24.00	28.00	27.75	27.00	24.25	23.50	26.25
24.00	25.00	30.00	23.25	26.25	21.50	26.00
28.00	24.50	22.50	28.25	21.25	19.75

a. Using an appropriate graph, see if it is plausible that the observations were selected from a normal distribution.

b. Calculate a two-sided 95% confidence interval for the population mean.

c. The university ACT average for entering fresh- men that year was about 21. Are the calculus students better than average, as measured by the ACT?

Reference no: EM131125440

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