Exam 2: The Mean, Variance, Standard Deviation, and Z Scores

The median is greater than the mean in a distribution that is:

A deviation score is the difference between the score and the __________.

What is the median of the following scores: 4, 4, 6, 7, 8, 8, 9, 10, 11, 2, 1, 4?

In a perfectly symmetrical unimodal distribution:

A researcher observes the level of aggression of six 5-year-old boys over the course of a school day. The number of incidents for the group of boys was 2, 4, 6, 12, 8, 10. What is the mean number of aggressive acts for this group of children?

Qualitative research techniques are likely to involve each of the following EXCEPT:

When a distribution is skewed to the right:

What is the median of the following group of scores: 1, 2, 2, 3, 4, 4, 4, 6, 8, 10?

In relation to the other people in their classes, who had the better exam score?

Based on the scores 1, 9, 3, 6, 1, 2, 6, 2, 2, 8, a score of 4 is the __________.

A business researcher has to decide which of three employees should be placed in a particular job that requires a high level of perceptual-motor coordination. All three employees have taken tests of perceptual-motor coordination, but each took a different test. Employee A scored 15 on a test with a mean of 10 and a standard deviation of 2. Employee B scored 350 on a test with a mean of 300 and a standard deviation of 40. Employee C scored 108 on a test with a mean of 100 and a standard deviation of 16. On all three tests, higher scores mean greater coordination. Which employee has the best perceptual-motor coordination? Explain your answer to someone who has never had a course in statistics.

Alex's Z score on his abnormal psychology exam was -.05, indicating that he scored well above the mean on the exam. (True or False).

A Z score is -3 and the sample's M = 30 and SD = 6. The raw score is __________.

The variance of the scores 1, 7, 13 is __________.

For a particular group of scores, M = 20 and SD = 5. What is the Z score for a raw score of 10?

All of the following are true statements about a Z score EXCEPT:

A clinical psychologist administered a standard test of symptoms of three different behavioral disorders to a new patient at a mental health clinic. On the scale that measures Disorder F (in the general public, M = 60, SD = 8), the person's score is 62. On the scale that measures Disorder H (in the general public, M = 32, SD = .5), the person's score is 34. And on the scale that measures Disorder K (in the general public, M = 83, SD = 12), the person's score is 89. For the symptoms of which disorder or disorders did this person score substantially higher than the general public? Explain your answer to someone who has never had a course in statistics.

Based on the following scores 1, 2, 3, 4, 5, 6, 8, 8, 8, 9, 10, a score of 8 is the:

The most widely used way of describing the spread of a group of scores is the:

The standard deviation is the __________ of the variance.