The following information is obtained for a sample of 16 observations taken from a population.
SSxx = 340.700, se = 1.951, and ŷ = 12.45 + 6.32x
a. Make a 99% confidence interval for B.
b. Using a significance level of .025, can you conclude that B is positive?
c. Using a significance level of .01, can you conclude that B is different from zero?
d. Using a significance level of .02, test whether B is different from 4.50. (The null hypothesis here will be H0: B = 4.50 and the alternative hypothesis will be H1: B ≠ 4.50. Notice that the value of B = 4.50 will be used to calculate the value of the test statistic t.)