Suppose that we want to estimate the mean reading speed of second graders. The r

Question

Suppose that we want to estimate the mean reading speed of second graders. The random sample of student's reading speeds we choose has a mean of 30.4 words per minute and a standard deviation of 3.7 words per minute. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making interface statements about the population mean. (In the table, Z refers to a variable having a standard normal distribution, and t refers to a variable having a t distribution.)

Explanation / Answer

1) Z , because the population sd is known

2) Could use either Z or t

3) Unclear

4) t

5) Z

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