The correlation coefficient r is a number that indicates the direction and the strength of the relationship between the dependent variable y and the independent variable x.
Indicate whether the statement is true or false
Q. 2The F-distribution is a symmetric distribution.
Indicate whether the statement is true or false
Q. 3If the distribution of sales is thought to be symmetric with very little variation, then:
a. the whiskers on a box and whisker plot should be about half as long as the box is wide
b. the width of the box in a box and whisker plot will be very wide but the whisker will be very short
c. the left and right edges of the box in a box and whisker plot will be approximately equal distance from the second quartile
d. none of these
e. all of these
Q. 4The chi-square distribution is used for making inferences about the ratio of the variances of two populations.
Indicate whether the statement is true or false
Q. 5If a data set has 15 values that have been sorted in ascending order, which value in the data set will be the 25th percentile?
a. the fourth value
b. the third value
c. the second value
d. the first value
e. There is not enough information to answer this question.
Q. 6When the null hypothesis there is no difference between two population proportions is being tested, the test statistic will be the difference between the two population proportions, divided by the standard error.
Indicate whether the statement is true or false
Q. 7Lily recently took a biochemistry test, and it was reported back to her that her score placed her at the 97th percentile. Therefore:
a. Lily's score has a z-score of 0.97
b. Lily was in the bottom 3 of the students who took the test
c. Lily scored as high or higher than 97 of the students who took the test
d. ninety-seven students who took the test scored below Lily
e. ninety-seven students who took the test scored the same as Lily
Q. 8For right-hand tail test of the difference between proportions using two independent samples at the 5 level of significance, the critical value for the z-test is 1.65, but it is 1.96 for the t-test.
Indicate whether the statement is true or false
Quick Reply
