43. Product testing. Since many people have trouble programming their VCRs, an electronics 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 program their VCRs. 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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Ho: p = 0.96 HA: p = 0.96 SRS, 0.96(200) > 10 188 (0.94)(0.06) 0.94; SD() = = 0.017 200 200 0.96 -0.94 1.18 0.017 P = P(>1.18) = 0.12