Chapter PII, Problem 31RE

(a)

To determine

To explain what direction and strength of correlation would you expect in the following situation.

Explanation of Solution

It is given in the question that considers the association between a student’s score on a French vocabulary test and the weight of the student. Thus, the situation in this is that the students are all in third grade. So, there is no correlation between a student’s score on a French vocabulary test and the weight of the student and also weight would have no effect on vocabulary.

(b)

To determine

To explain what direction and strength of correlation would you expect in the following situation.

Explanation of Solution

It is given in the question that considers the association between a student’s score on a French vocabulary test and the weight of the student. Thus, the situation in this is that the students are in third grade through twelfth grades in the same school district. So, in this we have positive association between a student’s score on a French vocabulary test and the weight of the student and the association is moderately strong as long as the curriculum in grades included French.

(c)

To determine

To explain what direction and strength of correlation would you expect in the following situation.

Explanation of Solution

It is given in the question that considers the association between a student’s score on a French vocabulary test and the weight of the student. Thus, the situation in this is that the students are in tenth grade in France. So, there is no correlation or association between a student’s score on a French vocabulary test and the weight of the student and also the weight would have no effect on vocabulary.

(d)

To determine

To explain what direction and strength of correlation would you expect in the following situation.

Explanation of Solution

It is given in the question that considers the association between a student’s score on a French vocabulary test and the weight of the student. Thus, the situation in this is that the students are in third through twelfth grades in France. So, there is a positive association or correlation between a student’s score on a French vocabulary test and the weight of the student and also it is very strong because as grade would increase so would vocabulary.