Psychological Statistics Final Review
Questions and Answers 2024
1. What side contains the greatest frequency on a left-skewed distribution?: -
Right Side
2. What side contains the greatest frequency on a right-skewed distribution?-
: Left Side
3. X-Axis labeled on a histogram: Scores
4. Y-Axis labeled on a histogram: Proportion/Probability, percentage, count/ fre-
quency
5. What are the two measures of center?: Mean & Median
6. Mean Formula: n= Sum of the terms/ number of terms
7. Median Formula: (n+1)/2
8. Calculate range: Highest value - lowest value
9. The is the standard deviation squared: Variance
10.The is the square root of the variance: Standard Deviation
11.'s': sample standard deviation
12.'s2': sample variance
13.'Ã: 'population standard deviation
14.'Ã2: 'population variance
15.What does standard deviation tell us?: How far scores deviate from the mean. The
larger the standard deviation the more spread out the data is.
16.What do z-scores tell us?: How far a score is from the mean in SD, find how typical
a score is in a particular distribution, & find areas under the normal curve
17.What is the range of the correlation coefficient 'r' ?: -1 to 1
18.What does 'r' tell us?: The direction (+/-) and how strong a LINEAR relationship is
between two quantitative variables (when linear)
1/3
, Psychological Statistics Final Review
Questions and Answers 2024
19.Regression Equation:: y=a+bx (a= y-intercept, b=slope)
20.What does regression tell us?: The amount that y changes due to x
21. I select a set of 10 individual &
measure their attitudes towards workplace equality. This set of 10 individuals is a ,
which was drawn from the larger
.: sample; population
22.What variable is manipulated experimentally?: Independent variable
23.What is the measure that is obtained from each individual in an experi-
ment?: Dependent variable
24.Why do scientists prefer using simple random sampling (SRS)?: Rules out any
bias in a sample group
25.Simple "And" Rule: P(A&B)= P(A) x P(B)
26. According to the central limit theorem, when we plot many sample means into a
single distribution of sample means, the mean of the distribution is
& the standard deviation is .: ¼n; Ã/
2/3
Questions and Answers 2024
1. What side contains the greatest frequency on a left-skewed distribution?: -
Right Side
2. What side contains the greatest frequency on a right-skewed distribution?-
: Left Side
3. X-Axis labeled on a histogram: Scores
4. Y-Axis labeled on a histogram: Proportion/Probability, percentage, count/ fre-
quency
5. What are the two measures of center?: Mean & Median
6. Mean Formula: n= Sum of the terms/ number of terms
7. Median Formula: (n+1)/2
8. Calculate range: Highest value - lowest value
9. The is the standard deviation squared: Variance
10.The is the square root of the variance: Standard Deviation
11.'s': sample standard deviation
12.'s2': sample variance
13.'Ã: 'population standard deviation
14.'Ã2: 'population variance
15.What does standard deviation tell us?: How far scores deviate from the mean. The
larger the standard deviation the more spread out the data is.
16.What do z-scores tell us?: How far a score is from the mean in SD, find how typical
a score is in a particular distribution, & find areas under the normal curve
17.What is the range of the correlation coefficient 'r' ?: -1 to 1
18.What does 'r' tell us?: The direction (+/-) and how strong a LINEAR relationship is
between two quantitative variables (when linear)
1/3
, Psychological Statistics Final Review
Questions and Answers 2024
19.Regression Equation:: y=a+bx (a= y-intercept, b=slope)
20.What does regression tell us?: The amount that y changes due to x
21. I select a set of 10 individual &
measure their attitudes towards workplace equality. This set of 10 individuals is a ,
which was drawn from the larger
.: sample; population
22.What variable is manipulated experimentally?: Independent variable
23.What is the measure that is obtained from each individual in an experi-
ment?: Dependent variable
24.Why do scientists prefer using simple random sampling (SRS)?: Rules out any
bias in a sample group
25.Simple "And" Rule: P(A&B)= P(A) x P(B)
26. According to the central limit theorem, when we plot many sample means into a
single distribution of sample means, the mean of the distribution is
& the standard deviation is .: ¼n; Ã/
2/3
