step 4 of the problem

Z-test

(Seniors and prescriptions) A researcher wants to know whether seniors ages 65 and older take more or fewer preseription medications when they take u 5 prescription drugs with o-3. Below are the data from 20 seniors. are treated by a gerontology specialist. From the census, she knows that seniors 4 7 3 0 2 3 5 10 4 6 2 0 1 3 2 4. 1 5 2 5 Step 1. Identify the given information. 3.45 X= Step 2. State your hypotheses. Is it a one-tailed or two-tailed test? two-tailed a. b. Research: c. Statistical: Step 3. Set the significance level. a = .05. Step 4. Do the statistics. Compute the test statistic. a. b. Determine whether the value of the test statistic is in the critical region (hint: draw a picture)