A Cancer Research Group Surveys 100 Women More Than 40 $\alpha$

Multiple Choice

A cancer research group surveys 100 women more than 40 years old to test the hypothesis that 50% of women in this age group have regularly scheduled mammograms.Forty of the women respond affirmatively.Using $\alpha$ = 0.05,the critical value of chi-square is _______.

A) 7.38
B) 5.02
C) 3.84
D) 5.99
E) 6.99