The best-fitting regression line can be used to:
a. find the actual value of y for a given value of x
b. estimate or predict the value of y for a given value of x
c. calculate the correlation coefficient
d. all of these
e. none of these
Q. 2The shape of the chi-square distribution depends on the size of the sample.
Indicate whether the statement is true or false
Q. 3A manager of a supermarket wishes to show the relationship between the number of customers who come to the store on weekends, and the total volume of sales (in dollars) during the same weekend. Which of the following graphs would likely be most useful if the manager has a sample of 52 weekends worth of data?
a. bar chart
b. pie chart
c. box and whisker plot
d. scatterplot
e. histogram
Q. 4The data used in a chi-square multinomial test are always enumerative in nature.
Indicate whether the statement is true or false
Q. 5If all the points in a scatterplot lie on the least squares regression line, then the correlation coefficient r must be:
a. 1.0
b. 1.0
c. either 1.0 or 1.0
d. 100
e. 10
Q. 6A multinomial experiment arranges the data into a two-way classification such that the totals in one direction are predetermined.
Indicate whether the statement is true or false
Q. 7A perfect straight line sloping downward would produce a correlation coefficient equal to:
a. +1
b. 1
c. +2
d. 2
e. 0
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