Chapter 2
The sum of the deviations from or about the mean will always equal...
0
The mean score for physics test scores is 72, with a standard deviation of 4. Your score on the test is 80. How many standard deviations above the mean is your test score?
2
A sample of n=225 scores has XBar =103 and S^2=16. What is the sample standard deviation?
4
A measure that summarizes a distribution in terms of its centrality or typicality is: ________ .
A measure of central tendency.
The measure of dispersion that is based upon absolute values of deviations from the mean is the:
Average or mean deviation.
The ________ is found by calculating the sum of all of the scores in a distribution and then dividing the sum by the number of scores in the distribution.
Mean
µ is the symbol that represents the:
Standard deviation of a population.
Which of the following is NOT a measure of central tendency? A. The median B. The average deviation C. The mode D. The mean
The average deviation
Which of the following is NOT a measure of dispersion? A. The standard deviation B. The median C. The variance D. The mean deviation
The median
In order to obtain a more accurate reflection of the standard deviation or variance of the population, the standard deviation and variance for a sample are calculated by using ________ in the denominator of the formula, as opposed to using ________ in the formula.
n-1; n
One way to think about a Z score is to think of it as the:
ratio of the difference between a particular score and the mean of the distribution to the standard deviation of the distribution
The symbol used for standard deviation of a sample is:
s
The symbol used for the variance of a sample is:
s^2
The symbol used for standard deviation of a population is:
σ
The symbol used for the variance of a population is:
σ^2
What is the position of the median in the following distribution? {1, 4, 5, 7, 12, 14, 1, 13, 9, 10}
5. 5th score.
Assume you are working with population of N= 16 scores. The sum of all of the scores is equal to 96. What is the population mean?
6
What is the mode for the following distribution? {72, 83, 91, 72, 64, 93}
72
What is the value of the median in the following distribution? {1, 4, 5, 7, 12, 14, 1, 13, 9, 10}
8
A population of N=400 has µ=25 and σ=9. What is the population variance?
81
The range is...
A statement of the lowest and the highest score in the distribution.
The measure of central tendency that is sensitive to extreme scores is the:
Mean
XBar is the symbol that represents:
Mean of a sample
The score that is located in the middle of a distribution or the score that cuts a distribution in half is the:
Median
What is the relationship between the standard deviation and the variance?
The variance is equal to the standard deviation, squared.