Question

True or false

1.T or F:A numerical variable is continuous if it’s possible values correspond to isolated points
on the number line.

2.T or F:A control group provides a baseline for comparison with a treatment group.
3.T or F: A unimodal set of data is one that contains only one variable.
T or F: When using histograms to compare groups of different sizes, one may use either
frequencies or relative frequencies for the vertical axis and still be effective.

4.T or F:One disadvantage of using the mean as a measure of center for a data set is that its
value can be affected by the presence of even a single outlier in the data set.

5.T or F:he interquartile range is a measure of spread in a set of data.
T or F: for any given data set, the median must be greater than or equal to the lower quartile,
and less than or equal to the upper quartile.

6.T or F: The standard deviation about the least squares line is roughly the typical amount by
which an observation deviates from the least squares line.
7.T or F :The interquartile range is resistant to the effect of outliers.
8.T or F:The correlation coefficient, r, does not depend on the units of measurement of the two
variables.

Answer 1

1. A numerical variable is continuous if it’s possible values correspond to isolated points

on the number line. - False

2. A control group provides a baseline for comparison with a treatment group. - True

3. A unimodal set of data is one that contains only one variable. - True

When using histograms to compare groups of different sizes, one may use either

frequencies or relative frequencies for the vertical axis and still be effective. - True

4. One disadvantage of using the mean as a measure of center for a data set is that its

value can be affected by the presence of even a single outlier in the data set. - True

5. The interquartile range is a measure of spread in a set of data. - True

for any given data set, the median must be greater than or equal to the lower quartile,

and less than or equal to the upper quartile. - True

6. The standard deviation about the least squares line is roughly the typical amount by

which an observation deviates from the least squares line. - True

7. The interquartile range is resistant to the effect of outliers. - True

8. The correlation coefficient, r, does not depend on the units of measurement of the two variables. - True

Good luck with your studies!!!