Question: Suppose we are testing people to see if the rate of use of seat belts has changed from a previous value of 88%. Suppose that

Suppose we are testing people to see if the rate of use of seat belts has changed from a previous value of 88%. Suppose that in our random sample of 500 people, we see that 450 have the seat belt fastened.

a. About how many out of 500 would we expect to be using their seat-belts if the proportion who use seat belts is unchanged?

b. We observe 450 people out of a random sample of 500 using their seatbelts. The p-value is 0.167. Explain the meaning of the p-value.

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