Question

a.) The sample mean for a data set is 7.691, where n = 72 and s...

a.) The sample mean for a data set is 7.691, where n = 72 and s = 2.004. The data is approximately normal and σ is unknown. Should we use a t distribution, a normal distribution, or neither to test the null hypothesis?

b.) Given two independent samples that have been randomly selected.
Control Group: sample mean = 52, n = 67, s = 10.
Treatment Group: sample mean = 56, n = 56, s = 5.
We wish to test the claim that the two samples come from populations with the same mean. What is the magnitude (absolute value) of the test statistic?

6.35

9.34

7.15

2.72

7.31

2.00

5.65

2.87

Math   Statistics-And-Probability   
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