Deck 5: The Basics of Statistical Analysis

Question 1

Which descriptive statistic identifies the middle score in a data set?

A) Range
B) Median
C) Mode
D) Mean

Answer 1

B

Question 2

Which of the following is a disadvantage of using the mean as a measure of central tendency?

A) Influenced by outlying scores
B) Resistant to sampling differences
C) Cannot be used with parametric statistics
D) Only calculated from one data point

Answer 2

A

Question 3

Imagine you have calculated the variance for a dataset and the result is 9. How would you then calculate the standard deviation?

A) 9²
B) 9/N
C) √9
D) 9/N-1

Answer 3

C
Explanation: You should take the square root of the variance to calculate the standard deviation. So the correct answer is √9.

Question 4

If a dataset has a large amount of low scoring data points and a small amount of high scoring outliers, how would you describe the distribution of the dataset?

A) Positively skewed
B) Negatively skewed
C) Leptokurtic
D) Platykurtic

Question 5

To calculate a z score, you need which three values?

A) A participant's raw score, a participant's standard deviation and the mean for the whole dataset.
B) A participant's raw score, the N for the whole dataset and the standard deviation from the whole dataset.
C) A participant's raw score, the mean for the whole dataset and the standard deviation from the whole dataset.
D) A participant's raw score, the mean for the whole dataset and the N for the whole dataset.

Question 6

If you were to use an alpha level of .025, what is the chance of having committed a Type I Error?

A) 25%
B) .25%
C) .025%
D) 2.5%

Question 7

If you were to adopt an alpha level of .005, which of the following p values would be significant?

A) p < .001
B) p < .010
C) p < .025
D) p < .050

Question 8

The degrees of freedom in an analysis are based on…

A) The variance in the dataset
B) The central tendency in the dataset
C) The number of participants
D) The alpha level you adopt

Question 9

What is the median value for all of the participants?

A) 5
B) 6
C) 5.5
D) 8

Question 10

What is the mode for the 8 year old participants?

A) 4
B) 5
C) 6
D) 8

Question 11

What is the mean value for participants' age 12 years old?

A) 7.0
B) 5.3
C) 3.6
D) 6.0

Question 12

What is the variance for all of the participants?

A) 2.2
B) 2.8
C) 1.0
D) 4.9

Question 13

What is the standard deviation for the participants who are 8 years old?

A) 1.67
B) 2.80
C) 1.00
D) 2.21