A medical researcher wishes to determine if there is a relationship between the number of prescriptions written by pediatricians and the ages of the children for whom the prescriptions are written.
She surveys all the pediatricians in a geographical region to collect her data. What is the response variable? A) Number of prescriptions written
B) Pediatricians surveyed
C) Age of the children for whom prescriptions were written
D) Number of children for whom prescriptions were written
Q. 2An instructor wishes to determine if there is a relationship between the number of absences from his class and a student's final grade in the course. What is the explanatory variable?
A) Absences B) Final Grade
C) The instructor's point scale for attendance D) Student's performance on the final examination
Q. 3An education researcher randomly selects 60 of the nation's junior colleges and interviews all of the professors at each school. What sampling technique was used?
A) cluster
B) simple random
C) stratified
D) convenience
E) systematic
Q. 4A researcher determines that the linear correlation coefficient is 0.85 for a paired data set. This indicates that there is
A) a strong positive linear correlation.
B) a strong negative linear correlation.
C) no linear correlation but that there may be some other relationship.
D) insufficient evidence to make any decision about the correlation of the data.
Q. 5In interpreting a boxplot of a data set we note that the median is to the left of the center of the box and the right line is longer than the left line. We can conclude that
A) The data is skewed right.
B) The data is skewed left.
C) The data is symmetric.
D) Skewness or symmetry cannot be determined by a box plot.
Q. 6The names of 30 employees are written on 30 cards. The cards are placed in a bag, and three names are picked from the bag. What sampling technique was used?
A) simple random
B) stratified
C) cluster
D) convenience
E) systematic
Quick Reply
