Deck 2: Descriptive Statistics

Question 1

What is the relationship between the variance and standard deviation?

A)The variance = standard deviation squared
B)The standard deviation = the variance squared
C)The variance = the standard deviation multiplied by the mean
D)There is no straightforward relationship between the variance and standard deviation

Answer 1

The variance = standard deviation squared

Question 2

Questions relate to the following histogram:

Which condition has the larger interquartile range?

A)Treatment
B)Placebo
C)The interquartile ranges are approximately equal
D)We can't tell from the graph which has the larger interquartile range

Answer 2

Placebo

Question 3

Questions relate to the following histogram:

Which row in the data file contains an outlier?

A)4
B)5
C)7
D)8

Answer 3

8

Question 4

For the data given in question 3 what is the range?

A)21
B)10
C)19
D)11

Question 5

Inferential statistics are used for:

A)generalising from sample data to populations
B)describing the data in a sample
C)graphing your data
D)all of the above

Question 6

Given the following set of data, which measure of central tendency would be most appropriate?
15, 17, 19, 15, 13, 14, 10, 21, 18, 19, 19

A)Mode
B)Median
C)Mean
D)Standard deviation

Question 7

For the data presented in question 3 what are the mean, median and mode?

A)17, 19, 18
B)16.36, 17, 19
C)10, 17, 21
D)17, 18, 19

Question 8

Why do we square the deviation scores when calculating the variance?

A)Because squared deviation scores are in the original units of measurement of the sample
B)Because adding all the deviation scores will always give a value of zero
C)Because you cannot generate an average for negative scores

Question 9

Which of the following measures of central tendency is not appropriate when you have extreme scores in your sample data?

A)Mode
B)Median
C)Mean
D)None of the above

Question 10

Questions relate to the following histogram:

What is the median for the Placebo group?

A)4
B)17
C)12
D)22