Question

1) A drug company is studying the effect of a new drug. In clinical trials, the researcher used a one-tailed test. By using a one-tailed test instead of a two-tailed test, the researcher has

A) Expanded the critical region.

B) Changed the critical value.

C) Decreased the probability of rejecting the H0.

2) In a hypothesis test, when the obtained statistical value is larger than the critical value

A) The researcher rejects the null hypothesis.

B) The researcher fails to reject the null hypothesis.

C)The answer cannot be determined from the information provided.

3) A 95% confidence interval was calculated to be (15, 21). If the researcher increases the confidence level from 95% to 99%

A)The range of 99% of the CIs will be smaller than (15, 21).

B) The range of 99% of the CIs will be larger than (15, 21).

C) The range of 99% of the CIs will be equal to (15, 21).

4) One assignment allowed students to discuss in groups. There are six groups and each group include 6 students. The true average score of the whole class is 86. The average score of your group is 85 and the SD of your group is 3. If you obtained a score of 87 on this assignment, how many students in your group had a higher score than yours? How many groups in your class had a higher average score than your group? (hint: Sample distribution and sampling distribution. There is not much calculations needed here. Think conceptually.)

A) 1 student(s); 5 group(s)

B) 5 student(s);2 group(s)

C) 2 student(s);1group(s)

5) A researcher found the regression slope between IQ scores and reading ability is 0.5. Which of the following is NOT correct?

A) The people who have higher IQ scores tend to have higher reading ability.

B) The people who have higher IQ scores are predicted to have a higher reading ability.

C) Student A has a higher IQ score than student B, so student A will also have higher reading ability than student B.

D) Student A has a higher IQ score than student B, so student A is predicted to have a higher reading ability than student B

Answer 1

1) A drug company is studying the effect of a new drug. In clinical trials, the researcher used a one-tailed test. By using a one-tailed test instead of a two-tailed test, the researcher has(the answer is Option B)

A) Expanded the critical region.

B) Changed the critical value.

C) Decreased the probability of rejecting the H0.

2) In a hypothesis test, when the obtained statistical value is larger than the critical value(The answer is option A)

A) The researcher rejects the null hypothesis.

B) The researcher fails to reject the null hypothesis.

C)The answer cannot be determined from the information provided.

3) A 95% confidence interval was calculated to be (15, 21). If the researcher increases the confidence level from 95% to 99%(The answer is option B)

A)The range of 99% of the CIs will be smaller than (15, 21).

B) The range of 99% of the CIs will be larger than (15, 21).

C) The range of 99% of the CIs will be equal to (15, 21).

4) One assignment allowed students to discuss in groups. There are six groups and each group include 6 students. The true average score of the whole class is 86. The average score of your group is 85 and the SD of your group is 3. If you obtained a score of 87 on this assignment, how many students in your group had a higher score than yours? How many groups in your class had a higher average score than your group? (hint: Sample distribution and sampling distribution. There is not much calculations needed here. Think conceptually.)(The answer is option A)

A) 1 student(s); 5 group(s)

B) 5 student(s);2 group(s)

C) 2 student(s);1group(s)

5) A researcher found the regression slope between IQ scores and reading ability is 0.5. Which of the following is NOT correct?(The answer is option A)

A) The people who have higher IQ scores tend to have higher reading ability.

B) The people who have higher IQ scores are predicted to have a higher reading ability.

C) Student A has a higher IQ score than student B, so student A will also have higher reading ability than student B.

D) Student A has a higher IQ score than student B, so student A is predicted to have a higher reading ability than student B