Question

1. Which type of correlation would you expect to find associated with

the height of an individual and the incidence of winning the lottery

1. pos. cor b) negative cor c) zero

2. Which type of correlation would you expect to find associated with the number of credits that student takes per semester and the tuition charge for this student

1. Pos b) neg c) zer0

3. A study reported that the mean time to distraction for college students working on a math problem was 4.8 minutes.

Suppose this is based on a sample size of 250 college students and that the sample standard deviation is 1.7 minutes.

Is this convincing evidence that the average attention span of college students working on a mathematics problem is greater than 5 minutes?

a) left tailed test b) right tailed c) two tailed

Answer 1

1) Answer: c) Zero Correlation

Explanation: There is no relationship between height of an individual and the incidence of winning the lottery. Thus

expect the zero correlation between height of an individual and the incidence of winning the lottery.

2) Answer: a) Positive correlation

Explanation: There is positive relationship between number of credits that student takes per semester and the tuition charge for this student. Hence we expect positive correlation between number of credits that student takes per semester and the tuition charge for this student

3) Answer: b) Right tailed test

Explanation: The alternative hypothesis for this test is, the average attention span of college students working on a mathematics problem is greater than 5 minutes. Hence the Test is right tailed.