The distribution of IQ scores is approximately normal with a population mean of 100 and a population standard deviation of 15. A researcher claims that the intelligence of children in a particular community is above the population mean. A sample of n = 9 children in the community, when tested, yields a sample mean of 112.8. Does this sample support the researcher's claim at a significance level of .05?
a. No, the sample does not support the researcher's claim.
b. There is no enough evidence to decide if the sample supports the researcher's claim or not.
c. Fail to reject the null hypothesis.
d. Yes, the sample support the researcher's claim.
Decision: Reject H 0 .... View the full answer