DSC04872

(d)    Is the value t = 1.65 statistically significant at the 10% level? At the 5% level? '

(e)    If you have software available, find the exact P-value.

7.14    The one-sample t statistic for a test of

H₀: /x = 30 H_a: fi < 30

based on n =^10 observations has the value t -4.45.

(a)    What are the degrees of freedom for this statistic?

(b)    How would you report the P-value based on Table D?

(c)    If you have software available, find the exact P-value.

7.15    The scores of four roommates on the Law School Admission Test (LSAT) are %

628, 593, 455, 503

Find the mean, the standard deviation, and the standard error of the mean. Is it appropriate to calculate a confidence interval for these data? Explain why or why not.