Question 1

If your raw score is greater than the mean, a z-score calculated from that raw score will be a positive number.

Accepted Answer

A) True 
 B)False

Question 2

A Poisson distribution commonly occurs with small numbers of independent counts.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is an accurate interpretation of z = 2.5?

Accepted Answer

A)  The score is at the 2.5 (3rd) percentile 
B)  The score is 2.5 standard deviations above the mean 
C)  2.5% of scores fall below this z-score 
D)  2.5% of scores fall above this z-score 
A)  The score is at the 2.5 (3rd) percentile 
B)  The score is 2.5 standard deviations above the mean 
C)  2.5% of scores fall below this z-score 
D)  2.5% of scores fall above this z-score

Question 4

What percentage of scores should fall between -1 SD and +1 SD from the mean?

Accepted Answer

A)  34% 
B)  68% 
C)  50% 
D)  none of these 
A)  34% 
B)  68% 
C)  50% 
D)  none of these

Question 5

If you roll a 6-sided die, what is the probability that it will land on 6?

Accepted Answer

A)  1/6 
B)  2/6 
C)  6 
D)  none of these 
A)  1/6 
B)  2/6 
C)  6 
D)  none of these

Question 6

According to your text, while in the midst of solving a statistical calculation, you should carry out all calculations to ______.

Accepted Answer

A)  1 decimal places 
B)  2 decimal places 
C)  6 decimal place 
D)  10 decimal places 
A)  1 decimal places 
B)  2 decimal places 
C)  6 decimal place 
D)  10 decimal places

Question 7

If F1F1F1S1F1F1F10 = 3 and F1F1F1S1F1F1F10 = 2 and scores are normally distributed, what proportion of scores fall below x = 1?

Accepted Answer

A)  .1587 
B)  .9192 
C)  .8413 
D)  .0808 
A)  .1587 
B)  .9192 
C)  .8413 
D)  .0808

Question 8

Should your data conform perfectly to a particular distribution?

Accepted Answer

A)  yes; if your data does not conform perfectly, it is not really a distribution 
B)  yes; all distributions are predictable 
C)  no; distributions are just prototypes 
D)  no; real data cannot conform perfectly to a distribution 
A)  yes; if your data does not conform perfectly, it is not really a distribution 
B)  yes; all distributions are predictable 
C)  no; distributions are just prototypes 
D)  no; real data cannot conform perfectly to a distribution

Question 9

If F1F1F1S1F1F1F10 = 25, and F1F1F1S1F1F1F10F1F1F1S1F1F1F10 = 4, x = 25 falls at the 25th percentile.

Accepted Answer

A) True 
 B)False

Question 10

If x̄ = 8.5, and s = 1, 6.68% of scores are above x = 10.

Accepted Answer

A) True 
 B)False

Question 11

The proportion of scores above z = 1.25 is .1056.

Accepted Answer

A) True 
 B)False

Question 12

If you want to compare scores from one distribution to scores from another distribution, you should ______.

Accepted Answer

A)  compare the directly 
B)  compare z-scores computed from each 
C)  compare the means of each distribution 
D)  compare the square root of each value 
A)  compare the directly 
B)  compare z-scores computed from each 
C)  compare the means of each distribution 
D)  compare the square root of each value

Question 13

In a normal distribution, what proportion of scores fall above z = 2?

Accepted Answer

A)  .0091 
B)  .0107 
C)  .0197 
D)  .0228 
A)  .0091 
B)  .0107 
C)  .0197 
D)  .0228

Question 14

If you compute a z-score of 1.5, how many standard deviations is its raw score from the mean?

Accepted Answer

A)  3 SDs below the mean 
B)  1.5 SDs below the mean 
C)  1.5 SDs above the mean 
D)  3 SDs above the mean 
A)  3 SDs below the mean 
B)  1.5 SDs below the mean 
C)  1.5 SDs above the mean 
D)  3 SDs above the mean

If your raw score is greater than the mean, a z-score calculated from that raw score will be a positive number.

A Poisson distribution commonly occurs with small numbers of independent counts.

Which of the following is an accurate interpretation of z = 2.5?

What percentage of scores should fall between -1 SD and +1 SD from the mean?

If you roll a 6-sided die, what is the probability that it will land on 6?

According to your text, while in the midst of solving a statistical calculation, you should carry out all calculations to ______.

If  = 3 and  = 2 and scores are normally distributed, what proportion of scores fall below x = 1?

Should your data conform perfectly to a particular distribution?

If  = 25, and ^ = 4, x = 25 falls at the 25th percentile.

If x̄ = 8.5, and s = 1, 6.68% of scores are above x = 10.

The proportion of scores above z = 1.25 is .1056.

If you want to compare scores from one distribution to scores from another distribution, you should ______.

In a normal distribution, what proportion of scores fall above z = 2?

If you compute a z-score of 1.5, how many standard deviations is its raw score from the mean?

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

Exam 4: Probability Distributions

If your raw score is greater than the mean, a z-score calculated from that raw score will be a positive number.

A Poisson distribution commonly occurs with small numbers of independent counts.

Which of the following is an accurate interpretation of z = 2.5?

What percentage of scores should fall between -1 SD and +1 SD from the mean?

If you roll a 6-sided die, what is the probability that it will land on 6?

According to your text, while in the midst of solving a statistical calculation, you should carry out all calculations to ______.

If  = 3 and  = 2 and scores are normally distributed, what proportion of scores fall below x = 1?

Should your data conform perfectly to a particular distribution?

If  = 25, and  = 4, x = 25 falls at the 25th percentile.

If x̄ = 8.5, and s = 1, 6.68% of scores are above x = 10.

The proportion of scores above z = 1.25 is .1056.

If you want to compare scores from one distribution to scores from another distribution, you should ______.

In a normal distribution, what proportion of scores fall above z = 2?

If you compute a z-score of 1.5, how many standard deviations is its raw score from the mean?

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

If  = 25, and ^ = 4, x = 25 falls at the 25th percentile.