Author Question: A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for ... (Read 183 times)

a0266361136 · **on:** Jul 25, 2018

A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for governor. Construct the 98 confidence interval for the proportion of all New York State union members who favor the Republican candidate.

A) 0.304 to 0.442 B) 0.308 to 0.438 C) 0.301 to 0.445 D) 0.316 to 0.430

Question 2

An education researcher wishes to assess the effectiveness of three different methods for teaching young children to read. The 380 children participating in the study are divided into three groups. The study runs for six months.

The children in the first group are taught using method A, the children in the second group are taught using method B, and the children in the third group are taught using method C. At the end of the six months, the reading ability of the children in the different groups is assessed. Why might randomization be used when dividing the children into three groups?

amandanbreshears · **Reply #1 on:** Jul 25, 2018

Answer to Question 1

B

Answer to Question 2

Answers will vary. Possible answer: randomization is used in order to minimize the effects of possible confounding factors such as aptitude for reading of the children in the different groups. Randomizing helps to ensure that in each group there is a mixture of reading aptitudes. Differences in reading ability between the three groups at the end of the study can then more readily be attributed to the teaching method.