Author Question: A college lecturer has devised a new method of teaching a particular mathematical concept and wishes ... (Read 32 times)

chandani · **on:** Jul 25, 2018

A college lecturer has devised a new method of teaching a particular mathematical concept and wishes to try out this teaching method on a representative sample of his students.

There are 76 students in his class and he wishes to obtain a simple random sample of 25 of them. Describe a method he could use to obtain the sample.

Question 2

A study was conducted to determine if listening to heavy metal music affects critical thinking. To test the claim, 136 subjects were randomly assigned to two groups. Both groups were administered a basic math skills exam.

The first group took the exam while heavy metal music was piped into the exam room, while the second group took the exam in a silent room. The mean exam score for the first group was 77, and the mean exam score for the second group was 91. The researchers concluded that heavy metal music negatively affects critical thinking. Identify (a) the research objective, (b) the sample, (c) the descriptive statistics, and (d) the conclusions made in the study.

Jadwiga9 · **Reply #1 on:** Jul 25, 2018

Answer to Question 1

Answers will vary. Possible answer: List the students' names alphabetically and assign them numbers 1 to 76 according to this list. Use a random number table to construct a list of 25 random numbers between 1 and 76 and select the students corresponding to those numbers.

Answer to Question 2

(a) if listening to heavy metal music affects critical thinking
(b) the 136 subjects
(c) the mean exam score for the first group = 77, and the mean exam score for the second group was 91
(d) that heavy metal music negatively affects critical thinking