Question

Market researchers selected a random sample of people from
region A and a random sample of people from region B. The
researchers asked the people in the samples whether they had tried
a new product. The difference between the sample proportions (B
minus A) of people in the regions who indicated they had tried the
new product was 0.15. Under the assumption that all conditions for
inference were met, a hypothesis test was conducted with the
alternative hypothesis being that the population proportion of B is
greater than that of A. The p

-value of the test was 0.34.

Which of the following is the correct interpretation of the
p

p

-value?

If the difference in proportions of people who have tried the
new product between the two populations is actually 0.15, the
probability of observing that difference is 0.34.

A

If the difference in proportions of people who have tried the
new product between the two populations is actually 0.34, the
probability of observing that difference is 0.15.

B

If the proportions of all people who have tried the new product
is the same for both regions, the probability of observing a
difference of at least 0.15 is 0.34.

C

If the proportions of all people who have tried the new product
is the same for both regions, the probability of observing a
difference of at most 0.15 is 0.34.

D

If the proportions of all people who have tried the new product is the same for both regions, the probability of observing a difference equal to 0.15 is 0.34.

Answer #1

*Answer: If the proportions of all people who have tried the
new product is the same for both regions, the probability of
observing a difference of at least 0.15 is 0.34.*

>> Null hypothesis, H0: The population proportion of B is equal to A

Alternative hypothesis, H1: The population proportion of B is greater than that of A

The P value, or calculated probability, is the probability of finding the observed, or more extreme, results when the null hypothesis is true.

So, if the population proportion of B is equal to A (null hypothesis is true), the probability of observing a difference of at least 0.15 is 0.34.

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