Question

In a random sample of 40 ed este tax returns w amount of lowed for state taxes. i ned that the mean amount of a n exced was $456 with a Mandard deviation of 52523. Construct and Werpreta 20% confidence interval for the men tional Click the loon to view the distribution table The lower bound Round to the nearest doar as needed) The upper bound is found to the dollar as needed) Interpreta 90% confidence interval for the mean additional amount of tax owed for state tax retums. Choose the correct answer below O A One can be 90% confident that the mean additional tax owed is greater than the upper bound OB. One can be confident that the mean additional taxowed is less than the lower bound OC. One can be 90% confident that the mean additional taxowed is between the lower and upper bounds.

Answer 1

n=49, Y=3456, s=2.523, c=90% do - 0.90 2011 df = nel =491 =48 4/2= 0.05 td/2, df = to.os, 48 = 1 ):677 (using t table) pot confidence intercal =x + t2/2, df x = 3456 I 1.677 X 2.523 ५१ => 3456 ± 1.677 X 2523 => 3456 Į 6o4.439 => [2851.561] [9060.439] Lower bound = [2851156 upper bound = 14060.44