For a standardized psychology examination, the scores have a mean of 500 and a variance of 9151. It is hypothesized that the variance, o, of scores for psychology majors on this exam is lower than...

Extracted text: For a standardized psychology examination, the scores have a mean of 500 and a variance of 9151. It is hypothesized that the variance, o, of scores for psychology majors on this exam is lower than 9151. A random sample of 18 exams completed by psychology majors had a mean of 505 and a variance of 3734. Assuming that scores among psychology majors on this exam are approximately normally distributed, may we conclude, at the 0.05 level of significance, that the hypothesis is correct? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis Ho and the alternative hypothesis H,. H, :0 H :U (b) Determine the type of test statistic to use. (Choose one) ▼ D=0 OSO (c) Find the value of the test statistic. (Round to three or more decimal places.) O