Question: 1.Some IQ tests are standardized based on the assumption that the population mean is 100 and the standard deviation is 15. Test graders decide to

1.Some IQ tests are standardized based on the assumption that the population mean is 100 and the standard deviation is 15. Test graders decide to reject this hypothesis if a random sample of 25 people has a mean IQ greater than 110. Suppose the true mean of the population is actually 105. Assuming that IQ scores are normally distributed, what's the probability of a Type II error?

.048
.9995
.952
.0005

2.Imagine you're a researcher and you need to perform a one-sided test of an alternative hypothesis. You decide to conduct a significance test at the .05 level. Which of the following ranges of z-scores would make the test statistic significant at .05 (one-tail) but not at .01?

z > 1.60
1.645
-1.96
z
1.645

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