Question 918895
Ho: p = 0.47 (last year)
Ha: p ≠ .47 
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n = 70
sample proportion = p-hat = 41/70 = 0.586
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test stat:: z(0.586) = (0.586-0.47)/sqrt[0.47*0.53/70] = .116/.0035 = 32.59
critical value: ±1.96
Reject Ho: 32.59 > 1.96
at the 5% significance level, the evidence supports a change in the rate