Since many people have trouble using all of the features on their smart phones, an executive training company has developed what it hopes will be easier instructions. The goal is to have at least 96% of customers succeed at being able to use any feature they wish. The company tests the new system on 200 people, 188 of whom were successful. Is this strong evidence that the new system fails to meet the company€™s goal? A student€™s test of this hypothesis is shown here. How many mistakes can you find?

There is strong evidence that the new system does not work.

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H0: p = 0.96 HAFþ关0.96 SRS, 0.96(200) > 10 200 0.94, SD(F)-、/ (0.94) (0.06 ) 0.017 0.96 0.94 0.017 = 1.18 P = P(z > 1.18) = 0.12