Mary Jo Fitzpatrick is the Vice President for Nursing Services at St. Lukes Memorial Hospital. Recently she noticed in the job postings for nurses that those thar are unionized seem to offer higher wages. She decided to investigate and gather the following sample information. Would it be reasonable for her to conclude that union nuerses earn more? Use the .02 significance level. 2. The decision rule is to reject H0 if Z greater than ___? 3. Compute the value of the test statistic. The test statistic is Z=___. 4. What is the p value?
GROUP MEAN WAGE SAMPLE STANDARD DEVIATION SAMPLE SIZE
$20.75 $2.25 40
Non union $19.80 $1.90 45