Chapter 8&9

Question 1

Which of the following is not true when investigating two population proportions?

A) when testing a claim about to population proportion, the P value method and the classical method are equivalent.

B) testing for equality of two population proportions cannot be done by determining whether there is an overlap between two individual confidence interval estimates of the two individual population proportions.

C) the P value method, or the classical method of hypothesis testing can be used to test the claim about two population proportions.

D) a conclusion based on a confidence interval, estimate will be the same as a conclusion based on a hypothesis test.

Answer 1

A conclusion based on a confidence interval estimate will be the same as a conclusion based on a hypothesis test

Question 2

Samples are independent when _________.

Answer 2

There is not natural pairing between the two samples.

Question 3

Which of the following statements are true concerning the mean of the differences between two dependent samples (matched pairs)?

Answer 3

1. If one has 25 matched pairs of sample data, there is a loose requirement that the 25 differences appear to be from a normally distributed population.
2. If one wants to use a confidence interval to test the claim that u subscript d is > than 0 with a 0.10 significance level, the confidence interval should have a confidence level of 80%.

Question 4

Which of the following is NOT a requirement of testing a claim about the mean of the differences from dependent samples?

Answer 4

The degrees of freedom are n-2

Question 5

What design principle is stressed for experiments or observational studies?

Answer 5

Using dependent samples with paired data is generally better than using two independent samples.