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An old consumer magazine study found that 75% of customers of a large electric utility are...

An old consumer magazine study found that 75% of customers of a large electric utility are very satisfied with the service they receive. The CEO claims that this has increased in recent years. To test this claim, the local newspaper surveyed 100 customers, and 83 of them said that they are very satisfied. Choose the option that correctly sets up the hypotheses to conduct this hypothesis test.

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Answer #1

Here the proportion of customers of a large electric utility are very satisfied with the service they receive is 75%

So p = 0.75

The CEO claims that this proportion has increased in recent years

Null Hypothesis H0 : p = 0.75

Alternate Hypothesis Ha : p 0.75

Null Hypothesis canbe represented as p = 0.75 or p 0.75   Most of the researchers use p = 0.75 type, but p 0.75 type is also correct. So check for the options

Alternate Hypothesis can be represent by Ha or H1

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