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 observed value of chi-square is __________.

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The chi-square statistic is calculated as ((observed - expected)^2 / expected). Here, expected is 50% of 100, which is 50. Observed is 40. So, ((40-50)^2 / 50) + ((60-50)^2 / 50) = 4.00.

A Cancer Research Group Surveys 100 Women More Than 40 α\alphaα

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