Deck 5: Standard Scores Z Scores

Question 1

Faculty in the Psychology Department at State University consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What is the percentile rank for an individual who consumes 8 cups of coffee per day?

A) 97.73
B) 2.28
C) 47.72
D) None of the above

Answer 1

97.73

Question 2

If the average height for women is normally distributed with a mean of 65 inches and a standard deviation of 2.5 inches, then approximately 68% of all women should be between _____ and _____ inches in height.

A) 62.5; 67.7
B) 60; 70
C) 57.5; 72.5
D) none of the above

Answer 2

62.5; 67.7

Question 3

Sue's first psychology exam score is -2 standard deviations from the mean in a normal distribution. The test has a mean of 75 and a standard deviation of 5. Sue's percentile rank would be approximately:

A) 16%.
B) 2.5%.
C) 65%.
D) none of the above.

Answer 3

2.5%.

Question 4

Henry's first history exam score is +1 standard deviation from the mean in a normal distribution. The test has a mean of 65 and a standard deviation of 5. Henry's percentile rank would be approximately:

A) 84%.
B) 55%.
C) 70%.
D) none of the above.

Question 5

Lee's first history exam score is +2 standard deviations from the mean in a normal distribution. The test has a mean of 65 and a standard deviation of 5. Lee's percentile rank would be approximately:

A) 97.5%.
B) 65%.
C) 75%.
D) none of the above.

Question 6

In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5. Approximately what percentage of students have scores between 75 and 85?

A) 68%
B) 80%
C) 95%
D) 99%

Question 7

In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5. Approximately what percentage of students have scores between 65 and 95?

A) 68%
B) 80%
C) 95%
D) 99%

Question 8

An individual at the 50^th percentile would have a z score of _____.

A) 0
B) +1
C) -1
D) none of the above

Question 9

An individual at the 75^th percentile would have a z score of approximately _____.

A) +1
B) +.67
C) -.85
D) none of the above

Question 10

An individual at the 25^th percentile would have a z score of approximately _____.

A) +1
B) -.67
C) +.85
D) none of the above

Question 11

Students in a psychology department consume an average of 5 cups of coffee per day with a standard deviation of 1.75 cups. The number of cups of coffee consumed is normally distributed.
-• What proportion of students consume an amount equal to or less than 6 cups per day?

Question 12

Students in a psychology department consume an average of 5 cups of coffee per day with a standard deviation of 1.75 cups. The number of cups of coffee consumed is normally distributed.
-• How many cups would an individual at the 80th percentile drink?