worksheet 2

11. In Question 6, the median would be?

40

12. In Question 6, the mode(s) would be?

44

5. A distribution with a negative skew has its 'tail' to the right (T/F)?

False

23. What is the MEDIAN for the scores in the frequency distribution shown here? X_______f 5 5 4 6 3 2 2 3 1 5

5

6. If the 13 scores on a quiz were 32, 44, 50, 38, 42, 22, 44, 40, 34, 46, 38, 44, and 28, the mean score would be? BE SURE TO ROUND OFF TO 2 DECIMAL PLACES.

38.62

17. In Question 6, the interquartile range would be?

10

20. If the 7 scores in a sample were 18, 25, 30, 32, 24, 22, and 25, the standard deviation would be? Use the formula below to calculate the standard deviation. There is an example on page 422 that I sent you.[

22.14

14. In Question 6, the range would be?

28

22. What is the MEAN for the scores in the frequency distribution shown here? BE SURE TO ROUND OFF TO 2 DECIMAL PLACES. X_______f 5 3 4 4 3 2 2 4 1 5

3.6

4. The theoretical normal curve is not symmetrical (T/F)?

False

What is the shape of the frequency distribution shown here? (Just name the shape; you do not have to draw it) X________f 10 4 9 5 8 12 7 22 6 22

Negatively Skewed Curves or Distributions

1. A histogram is a figure that shows the frequencies (or percentages) of a variable measured on an interval scale or a ratio scale (T/F)?

True

10. The median is considered to be relatively insensitive to extreme scores (T/F)?

True

19. The standard deviation was designed to describe the variability of the scores in a normal distribution (T/F)?

True

2. In a bar graph, the columns (or bars) do not touch each other (T/F)?

True

3. On the horizontal axis of a frequency polygon, you begin with one score or score interval lower (if possible) than the lowest obtained and end with one score or score interval higher (if possible) than the highest obtained (T/F)?

True

7. The mean is considered a measure of central tendency (T/F)?

True

8. A disadvantage of the mean is that it is sensitive to extreme scores in skewed distributions (T/F)?

True

9. The median is the middle score in a set of scores, provided the scores are arranged in order (T/F)?

True

18. The standard deviation is a measure of how much scores vary from the median of the scores (T/F)?

false

13. Variability refers to how much the scores vary from one another (T/F)?

true

15. The range can be very misleading, especially when there are extreme scores (outliers) (T/F)?

true

16. The interquartile range refers to the range of the middle 50% of the scores (T/F)?

true