Chapter 7

Question 1

What is the null hypothesis?

Answer 1

H₀ is the hypothesis that you assume to be correct (the original).

Question 2

What is the alternative hypothesis?

Answer 2

H₁ tells you about the parameter if your assumption is shown to be wrong.

Question 3

What is a one-tailed test?

Answer 3

When the probability of the alternative hypothesis is assumed to change in only one direction.
H₁: p < …
H₁: p > …

Question 4

What is a two-tailed test?

Answer 4

When the change of probability of the alternative hypothesis is unknown (could increase or decrease).
H₁: p ≠ …

Question 5

If you are given a significance level of 10%, what do you put for a 2-tailed test?

Answer 5

5%, as it can go in either direction.

Question 6

What is a critical region?

Answer 6

A region of the probability distribution which, if the test statistic falls within it, would cause you to reject the null hypothesis.

Question 7

if you’re testing at the 5% significance level and P(X≥4) > 0.05 and P(X≥5) < 0.05, what is the critical region?

Answer 7

The critical region is 5.