Question

Grade distribution guidelines for a statistics course are: 25% A's, 40% B's, 20% C's, 10% D's, and 5% Fs. A sample of 120 statistics grades at the end of the Winter semester showed 32 A's, 38 B's, 40 C's, 7 D's and 3 F's. Use a 5% significance level to test whether the actual grades deviate significantly from the expected grade distribution guidelines. What is the correct decision rule for this problem? Multiple Choice Reject HO, if computed chi-sqaure value > 9.488 Reject HO, if computed t-value <-2776 or > 2776 O Reject Ho, if computed z-value < - 196 of >196 O Reject Ho. If computed chi-square value > 11070

Answer 1

Reject Ho il computed chi square value>9.488 since cal X² = 16.466 > 9.488 reject to and conclude that the actual deviate significantly from guidelines the expected grade grade distribuition