Question: Suppose that we want to estimate the mean reading speed of second graders. The random sample of students' reading speeds we choose has a mean of 31.1 words per minute and a standard deviation of 2.4 words per minute. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean.

(Pick One) Z, t, could use either Z or t, or Unclear-The sample has size 10, and it is from a normally distributed population with a known standard deviation of 2.8

(Pick One) Z, t could use either Z or t, or Unclear. The sample has size 16 and it is from a population with a distribution about which we know very little.

(Pick One) Z, t, could use either Z or t, or Unclear. The sample has size 19, and it is from a normally distributed population with unknown standard deviation.

(Pick One) Z, t, could use either Z or t, or Unclear. The sample has size 75, and it is from a non-normally distributed population.

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