數學題 好急, 唔識 請幫手
2017/06/13 05:30
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數學題 好急, 唔識 請幫手
A marketing analyst claimed that at least 60% of the people making pruchases over $500 use a credit card. An independent researcher challenged this claim with results, which indicated that, of 860 surveyed, 425 used a credit card. Was this challenge justified at the 0.05 level of sigificance?
最佳解答:
H0: θ0>=0.6 H1: θ0<0.6 α=0.05 Reject the null hypothesis of z<=-1.645 x=425, n=860 Z =x-nθ0/√(nθ0(1-θ0)) =(425-860*0.6)/√(860*0.6*0.4) =-91/14.366 =-6.3344 since -6.3344<=-1.645 we reject the null hypothesis at the 0.05 level of significance and conclude that there are less than 60% of the people making purchases over $500 usa a credit card
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數學題 好急, 唔識 請幫手
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發問:A marketing analyst claimed that at least 60% of the people making pruchases over $500 use a credit card. An independent researcher challenged this claim with results, which indicated that, of 860 surveyed, 425 used a credit card. Was this challenge justified at the 0.05 level of sigificance?
最佳解答:
H0: θ0>=0.6 H1: θ0<0.6 α=0.05 Reject the null hypothesis of z<=-1.645 x=425, n=860 Z =x-nθ0/√(nθ0(1-θ0)) =(425-860*0.6)/√(860*0.6*0.4) =-91/14.366 =-6.3344 since -6.3344<=-1.645 we reject the null hypothesis at the 0.05 level of significance and conclude that there are less than 60% of the people making purchases over $500 usa a credit card
其他解答:
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