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WorksheetsChapter 4&5
Total questions: 12
Worksheet time: 36mins
A sample of n=10 scores has a mean of M=100 and a standard deviation of s=4. What is the sample variance?
2
8
16
10
A set of 11 scores has SS=110. If the scores are a sample, the sample variance is _____ and if the scores are a population, the population variance is ______.
11, 10
11, 11
10, 10
10, 11
Which of the following set of scores has the least amount of variability?
68, 75, 74, 83, 97
1254, 1259, 1261, 1263
81, 82, 82, 83, 94
5, 13, 17, 20, 31
One sample is selected to represent scores in treatment 1 and a second sample is used to represent scores in treatment 2. Which set of sample statistics would present the clearest picture of a real difference between the two treatments?
M1=46, M2=50, and both variances equal 36
M1=46, M2=50, and both variances equal 16
M1=48, M2=50, and both variances equal 36
M1=48, M2=50, and both variances equal 16
If you have a score of X=64 on an exam with M=70, you should expect a better grade if s=10 than if s=5.
True
False
A sample of n=10 scores has SS=90. For this sample, the variance is 9.
True
False
A population of scores has a μ of 50 and σ of 5. If every score in the population is multiplied by 3, then what are the new values for the mean and the standard deviation.
Mean is 150, and standard deviation is 5.
Mean is 150, and standard deviation is 15.
Mean is 50, and standard deviation is 15.
They both stay the same.
A population has a sum of squares of 100 and a variance of 4. What is the value of Σ(x−μ) for the population?
25
10
0
Cannot be determined
A population has a sum of squares of 100 and a variance of 4. How many scores are in the population?
25
16
50
Cannot be determined
For a population of scores, the sum of the deviation scores is always equal to 0.
True
False
A population of N=10 scores has a sum of squares of 80. What is the value of Σ(X−μ)2 ?
2.7
8
80
Cannot be determined without the set of scores
You have a score of X=65 on an exam. Which set of parameters would give you the best grade on the exam?
μ=60 and σ=10
μ=60 and σ=5
μ=70 and σ=5
μ=70 and σ=10
