Question

Assignment 5

11. An educational researcher wishes to compare the effectiveness of two different math textbooks. She has the tenth graders at one school use the first book for one year and the tenth  graders at another school use the second textbook for one year. At the end of the year, she gives the same math test to both classes and compares the results. A) The source B) Confounding variables C) The setting D) Selection bias E) Participation bias

12. ʺ38% of adults in the United States regularly visit a doctorʺ. This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. A) No bias B) Selection bias C) Participation bias D) Participation bias and selection bias

15. Which of the following describes the process by which scientists examine each othersʹ research? A) Considering the conclusion B) Peer review C) Participation review D) Interpretation

16. Which of the following quantities of interest would be the most difficult to define? A) The paint with the best looking finish B) The levels of lead in various brands of paint C) How water resistant a brand of paint is D) The least expensive brand of paint

17) Which of the following describes the bias that can occur when members of a studyʹs sample are volunteers? A) Single-blind bias B) Participation bias C) Sample bias D) Selection bias 3

18) The population of a town A) Quantitative B) Qualitative

19) The colors of  the houses in a city A) Quantitative B) Qualitative

20) The speed of a car in miles per hour A) Qualitative B) Quantitative

Answer 1

(11)

Correct option:

(B) Confounding variables

EXPLANATION:

In this experiment, the confounding variable is the individual talent of each student in math which varies from student to student.

(12)

Correct option:

(A) No bias

EXPLANATION: It is told," randomly selected members" So there is no selection bias. There is no tendency to act in a way that the participant thinks that the researcher wants him to act.So, no participant bias.

(15)

Correct option:

(B) Peer review

EXPLANATION:Peer review is the evaluation of scientific work by others.

(16)

Correct option:

(A) The paint with the best looking finish

EXPLANATION: This depends on the aesthetic view of an individual which is difficult to measure.

(17)

Correct option:

D. Selection bias

If the sample consists of volunteers, proper randomization is not achieved.

(18)

Correct option:

(A) Quantitative

(19)

Correct option:

(B) Qualitative

(20)

Correct option:

(A) Quantitative