psych stats

If a set of N = 4 has SS = 64, what is the variance? 1. 16 2. 8 3. 4 4. 2

1) 16

For a perfectly symmetrical distribution with a median of 30, what is the value of the mean? 1. 30 2. greater than 30 3. less than 30 4. cannot be determined from the information given

1. 30

Last week Andi had exams in Chemistry and in Spanish. On the chemistry exam, the mean was μ = 30 withσ=5,andAndihadascoreofX=45. OntheSpanishexam,themeanwasμ=60withσ=6and Andi had a score of X = 65. For which class should Andi expect the better grade? 1) Chemistry 2) Spanish 3) There is not enough information. 4) This is not correct answer.

1. Chemistry

A sample of n = 10 scores is selected from a population. The variability of the scores in the sample will tend to be ____ the variability of the scores in the population 1. less than 2. greater than 3. equal to 4. WTF

1. less than

For a sample with M = 80, a score of X = 88 corresponds to z = 2.00. deviation? (0.5 points for an incorrect response) 1) 2 2) 4 3) 8 4) 16

2)4

Without doing any calculations, which of the following samples has the largest variance? 1. 1,3,4,5,6 2. 1, 5, 8, 12, 22 3. 30, 32, 34, 35, 36

2. 1, 5, 8, 12, 22

What is the median for the following set of values? Scores: 1, 3, 4, 6, 7, 8, 12, 23 1. 6 2. 6.5 3. 7 4. 64/8=8

2. 6.5

Which of the following statements cannot be true for a distribution of scores? (0.5 points for an incorrect response) 1. 60% of the scores fall above the mean 2. 60% of the scores fall above the median 3. 60% of the scores fall above the mode 4. All of the above are false statements

2. 60% of the scores fall above the median

For the following sample of n=8 scores, what is the value of the range? 2, 3, 4, 4, 5, 7, 8, 10 1. 5 2. 7 3. 8 4. 10

3) 8

In a population with σ = 8, a score of X = 44 corresponds to a z-score of z = -0.50. What is the population mean? (0.5 points for an incorrect response) 1) μ=36 2) μ=40 3) μ=48 4) μ=52

3) μ=48

For a population with μ = 50 and σ = 10, what is the X value corresponding to z=0.4? (0.5 points for an incorrect response) 1) 50.4 2) 10 3) 54 4) 10.4

3)54

What is the mean for the following sample of scores? Scores: 1, 4, 5, 10 1. 20 2. 10 3. 5 4. 4

3. 5

Under what circumstances would a score that is above the mean by 5 points appear to be very close to the mean? 1. When the mean is much greater than 5 2. When the mean is much less than 5 3. When the standard deviation is much greater than 5 4. When the standard deviation is much less than 5

3. When the standard deviation is much greater than 5

A population has μ = 50 and σ = 5. If 10 points are added to every score in the population, then what are the new values for the mean and standard deviation? (0.5 for incorrect responses) 1. μ=50andσ=5 2. μ=50andσ=15 3. μ=60andσ=5 4. μ=60andσ=15

3. μ=60andσ=5

If you have a score of X = 75 on an exam, which set of parameters would give you the highest position within the class? 1. μ=70andσ=5 2. μ=70andσ=10 3. μ=60andσ=5 4. μ=60andσ=10

3. μ=60andσ=5

A z-score of z = -2.00 indicates a position in a distribution __. 1) above the mean by 2 points 2) above the mean by a distance equal to 2 standard deviations 3) below the mean by 2 points 4) below the mean by a distance equal to 2 standard deviations

4)below the mean by a distance equal to 2 standard deviations

If the standard deviation for a set of scores is zero, which of the following MUST be true? 1. All of the scores must be zero. 2. All of the scores must be 1. 3. The mean of the scores must be zero. 4. All of the scores must be the same.

4. All of the scores must be the same.

A population of N = 10 scores has a mean of μ= 6. After one score is removed, the mean is found to be M = 5. What is the value of the score that was removed? (0.5 points for an incorrect response) 1. X=10 2. X=5 3. X=3 4. X=15

4. X=15

What additional information is obtained by measuring two individuals on an interval scale compared to an ordinal scale? a) whether the measurements are the same or different b) the direction of the difference c) the size of the difference d) none of the options are correct

c) the size of the difference