1. A large school district is considering the adoption of a new policy that woul
ID: 3332128 • Letter: 1
Question
1. A large school district is considering the adoption of a new policy that would require elementary students to pass an exam before being promoted to the next grade. The PTA wants to see if parents agree with this plan. The PTA decides to run a poll on local TV news, asking people to text in their opinion. What kind of bias(es) are associated with this strategy? a. Voluntary response bias b. Undercoverage of part of the population c. Both a and b are correct. d. Neither a or b are correct NIU is concerned about the retention rate among its students, i.e. percentage of NIU students that return next semester. To do this, NIU randomly selects 200 students and records whether or not they return to NIU the following semester. Use this information to answer the following 4 questions. 2. What is the parameter? a. The percentage of all NIU students that returned. b. All NIU students that returned c. The 200 NIU students that were selected. d. The percentage of 200 students that returned. 3. What is the population? a. The percentage of all NIU students that returned. b. All NIU students that returned. c. All NIU students. d. The percentage of 200 students that returned. What is the statistic? a. The percentage of all NIU students that returned b. All NIU students that returned c. The 200 NIU students that were selected d. The percentage of 200 students that returned 4. 5. What is the sample? a. The percentage of all NIU students that returned. b. All NIU students that returned. c. The 200 NIU students that were selected. d. The percentage of 200 students that returned.Explanation / Answer
1. Correct option:
c. Both a and b are correct
EXPLANATION: (a) Here, the researcher (PTA) appeals to people to voluntarily participate in the survey. (b) People who do not see local TV news become unrepresentative in the sample.
2 (a) Correct option:
a. All NIU students that returned
(b) Correct option:
a. The percentage of all NIU students that returned.
(c) Correct option:
d. The percentage of 200 students that returned
(d) Correc option:
c. the 200 NIU students that were selected.
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