SOLUTION: Researchers had access to population data about the number of prior arrests for offenders facing prison time in Nevada. Those data included the following: mean number of prior arre

Question 1168603: Researchers had access to population data about the number of prior arrests for offenders facing prison time in Nevada. Those data included the following: mean number of prior arrests = 4, and standard deviation = 1.5.
A group of researchers in California wanted to examine whether or not our
offenders are similar to or different than Nevada’s prisoners. However, the
researchers were only able to get access to a sample of offenders facing prison time. The sample information included the following: mean number of prior arrests = 6, and sample size = 225.
The researchers in California decided to conduct a Z-test for One Sample Mean to examine potential differences in prior arrests between the two states.
9. The value of the observed z-statistic for the hypothesis test equals…
a. … 1.18.
b. … 2.00.
c. … -1.18.
d. … -2.00.
e. … 20.00.
I got E am I correct?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x bar-mean)/sigma/sqrt(n)
=2*15/1.5=20. You are correct.
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