In a 4-week study about the effectiveness of using magnetic insoles to treat pla

Question

In a 4-week study about the effectiveness of using magnetic insoles to treat plantar heel pain, 51 subjects wore magnetic insoles and 44 subjects wore nonmagnetic insoles. The results are shown at the right. At alpha equals =0.09, can you support the claim that there is a difference in the proportion of subjects who feel better between the two groups? Assume the random samples are independent Do you Feel Better? Magnetic Insoles Yes 18 No 38 Nonmagnetic Insoles Yes 19 No 28 The critical value(s) is(are)?

Explanation / Answer

Ho: There is no significant difference in proportion of subjects who feel better between two groups

Ha: There is significant diffference in proportions

It is two tailed test . The statistic is Z

Hence the critical values are -1.695,1.695

Excel function normsinv(0.09/2)

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