[A psychologist is administering an intervention in her clinic and calculates the mean level of anxiety symptoms in her sample of 150 patients to be 26. The standard deviation for the sample is 14. The population mean anxiety level on this scale for clinically diagnosed individuals is 31. The psychologist is interested in knowing whether the sample of treated patients from her clinic is significantly different than the overall population.]

Which test should you use to analyze this data?

Perform the appropriate test to calculate your test statistic

Write conclusion for this test that summarizes the numerical results obtained, makes a decision about the null hypothesis (with alpha () =.05, two tailed), and interprets these results.