50 students were randomly sampled and asked questions about their exercise habits. One of the
questions they were asked concerned the frequency of exercise, defined to be the number of
times they exercised in a week.
This variable would be characterized as which type of random
variable?
A) discrete B) continuous
Q. 2A study was designed to investigate the effects of two variables (1 ) a student's level of
mathematical anxiety and (2 ) teaching method on a student's achievement in a mathematics
course.
Students who had a low level of mathematical anxiety were taught using the traditional
expository method. These students obtained a mean score of 440 with a standard deviation of 50
on a standardized test. Assuming a mound-shaped and symmetric distribution, in what range
would approximately 68 of the students score?
A) between 390 and 490 B) below 490
C) below 390 and above 490 D) above 490
Q. 3Classify the following random variable according to whether it is discrete or continuous.
The number of pills in a container of vitamins
A) continuous B) discrete
Q. 4A study was designed to investigate the effects of two variables (1 ) a student's level of
mathematical anxiety and (2 ) teaching method on a student's achievement in a mathematics
course.
Students who had a low level of mathematical anxiety were taught using the traditional
expository method. These students obtained a mean score of 350 with a standard deviation of 40
on a standardized test. Assuming a mound-shaped and symmetric distribution, what
percentage of scores exceeded 270?
A) approximately 84 B) approximately 97.5
C) approximately 100 D) approximately 95
Q. 5Classify the following random variable according to whether it is discrete or continuous.
The speed of a car on a Los Angeles freeway during rush hour traffic
A) discrete B) continuous
Quick Reply
