If you wanted to examine whether attitudes toward learning differ based on students' grade in school (i.e. ,first,second,third) ,what is the independent variable of interest?

A) grade level
B) students' attitudes
C) parents' attitudes
D) level of parent involvement

The correlation between the two variables of interest is 0.081,which is significant at the 0.637 level.This means ______.

A) that the null hypothesis is rejected
B) that the research hypothesis is accepted
C) that the null hypothesis is accepted
D) that the null hypothesis cannot be determined

A student took a chemistry exam where the exam scores were mound-shaped with a mean score of 90 and a standard deviation of 64. She also took a statistics exam where the scores were mound-shaped, the mean score was 70 and the standard deviation was 16. If the student's grades were 102 on the chemistry exam and 77 on the statistics exam, then:

A) the student did relatively better on the chemistry exam than on the statistics exam, compared to the other students in each class.
B) the student did relatively better on the statistics exam than on the chemistry exam, compared to the other students in the two classes.
C) the student's scores on both exams are comparable, when accounting for the scores of the other students in the two classes.
D) it is impossible to say which of the student's exam scores indicates the better performance.
E) the student did relatively the same on both exams.

Given a normal distribution with a mean of 80 and a standard deviation of 20, an observation of x = 50 corresponds to a standard normal deviate:

A) of z = +1.5
B) of z = +3.0
C) of z = -1.5
D) of z = -3.0
E) of none of these

Assume a differential rate of 12.5 cents for odd lot sales and purchases. Mark sold 250 shares of PFB stock at $62. Commission charges were $0.20 per share. Compute the proceeds of the sale.​