Statistics Post Test #5

Which is the best measure of variability if you are interested in a gender breakdown of managerial position at a certain company?

None of these.

Which of the following data would be most appropriate to report standard deviation?

height of adult men

When you have a skewed distribution, it is better to use ______ than ______ .

interquartile range; range

A measure of central tendency is most representative of individual scores when there is _______ variability in the distribution.

little

Consider the set of scores, 3, 5, 6, 7, 10 in the distribution. An additional score of _______ in this set would affect the range.

11

Consider the set of scores, 3, 4, 8 in the distribution. An additional score of ______ in this set would NOT affect the sum of squares.

5

Which of the following set of scores has the largest sample variance?

5, 5, 5, 5, 5 2, 3, 4, 5, 6 3, 3, 4, 5, 5 1, 1, 1, 5, 5 Answer: 1,1,1,5,5

You asked 50 college students how many pets they own. What is NOT a possible score for a range for this study?

0.5

The range of the scores 17, 19, 19. 23, 26 is _______

9.0

If you have 100 people in your sample, what would be the degrees of freedom you use to calculate the sample standard deviation?

99

All scores in the data are used to calculate the range.

False

Degrees of freedom are used to correct for the fact that population standard deviation will always be less precise than the sample standard deviation.

False

The interquartile range is the best measure of variability for nominal data.

False

The range and interquartile range can be equal if there is no variability in the distribution.

True

Variability is one of the main types of descriptive statistics.

True

Population standard deviation can be calculated in SPSS by _____.

clicking on the standard deviation, then using a transformation

The interquartile range is ______ than the range.

more stable

When calculating s, the degrees of freedom are given by ______.

n-1

The difference between the maximum and minimum scores in a data set is called the _______.

range

It is simpler to calculate _____ than _____ in Excel.

range; interquartile range

You calculated a standard deviation of 100 exam scores using population standard deviation formula. However, you later find out that these 100 scores were sampled from a class of 150 students. The population standard deviation you calculated will be ______ the actual population standard deviation.

smaller than

If a score in a distribution changes in numerical value, it will necessary change the ______.

standard deviation

The _____ is the square root of the _____.

standard deviation; variance

Adding a score that is equal to the mean of the distribution will NOT change _______.

the range

Statistics that describe the spread of scores in the distributions are called measures of _______.

variability