# Stastics

Given the following distribution:  14, 10, 12, 14, 14, 10, 8

Calculate the mean, median, mode, standard deviation, and range.

Calculate the mean, median, mode, standard deviation, and range for

the following distribution:  109, 110, 109, 107, 106, 100, 80

1.When scores are arranged in order of magnitude, the researcher has formed a

a. histogram           b. measure of centrality

c. measure of dispersiond. distribution

2.When a distribution is skewed, the researcher who is interested in central tendency should use the

a. meanb. medianc. moded. percentile

3.The influence of a few extreme scores in one direction most effects the value of the

a. meanb. medianc. moded. percentile

4. The absicca is the          a. the horizontal axis     b. the vertical axis

c. the connected points on a polygon. d. a measure of central tendency

5.The following are all measures of central tendency except the

a. meanb. medianc. ranged. mode

6.When we say that the average height of all adult females in the U.S. is known to be 5″6″, we are using

a.  descriptive statistics

b.  inferential statistics

c.  predictive statistics

d.  probability estimates

7. When a researcher attempts to estimate the characteristics of an entire population on the basis

of sample measures, the techniques are called

a.  descriptive statistics

b.  inferential statistics

c.  Skewed statistics

d. b and c, but not a

8. The _____ is a point on a distribution/scale such that half the observation falls above it and half

below it.

a.mode

b.arithmetic mean

c.standard deviation

d.median

9. Statistics as a general field is divided into two subareas. They  are

a. predictive and inferential.

b. descriptive and inferential.

c. nominal and ordinal.

d. none of these.

10. When scores are arranged in order of magnitude, the researcher has formed a

a.histogram.

b.measure of centrality.

c.measure of dispersion.

d.distribution.

11. When a distribution shows a large majority of very low scores and a few very high scores, the distribution is said to be

a.skewed to the right

b.skewed to the left.

c.skewed to the middle

d.bimodal.

12. When each score is listed in order of magnitude, together with the number of individuals receiving each score, the researcher has set up

a.a unimodal distribution.

b.a bimodal distribution.

c.a skewed distribution.

d.a frequency distribution.

13. The ordinate is identical to the

a.X axis.

b.Y axis.

c.mean.

d.none of these.

14. The difference between the highest and lowest scores in any distribution is called

a.the deviation score.

b.the standard deviation.

c.the range.

d.none of these.

15.  One major defect of the range is that

a.it included the entire width of the distribution.

b.it is based on only two scores.

c.it is not a measure of variability.

d.all of these.

16. The standard deviation is a measure of

a.how far all the scores vary from the mean.

b.how far the middlemost 50% of cases vary form the mean.

c.how far the highest and lowest scores vary form each other.

d.central tendency.

17. The standard deviation must always be calculated with reference to the

a.decile.

b.median.

c.mode.

d.mean.

18. The more heterogeneous the distribution of scores,

a.the smaller the standard deviation.

b.the larger the standard deviation.

c.the more the distribution tends to be skewed.

d.the greater the chance of excluding extreme scores.

19. A distribution with a large standard deviation must also have a large

a.number of scores near the mean.

b.number of scores near the median.

c.variance.

d.none of these.

20. A platykurtic distribution always has

a.a relatively small standard deviation.

b.a relatively large standard deviation.

c.a standard deviation of zero.

d. a few extreme scores at just one end of the distribution.

21. The term which defines the flatness or peakedness of a curve is

a.homoscedasticity

b.rangevalues.

c.central tendency.

d.kurtosis.

22. When most scores cluster closely around the mean, the curve is

a.asymmetrical.

b.platykurtic.

c.shaped like a U

d.leptokurtic.

23. When an extremely homogeneous set of scores is graphed, then the resulting frequency distribution curve is

a.platykurtic.

b.leptokurtic.

c.mesokurtic.

d.bimodal.

24. If the range on a mesokurtic distribution is equal to 60, then the standard deviation will be approximately equal to

a.10.

b.360.

c..17.

d.impossible to determine from the facts given.

25. Of the following, indicate which is not a measure of variability

a.range

b.percentile

c.standard deviation

d.variance. 