Health Stats Ch. 13

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The empirical rule applies to a normal, bell-shaped curve (distribution) and indicates the percent of scores that lie within each standard deviation from the mean; within + or - 1 SD = 68%; + or - 2 SDs = 95%; + or - 3 SDs = 99.7%.

true

The symbol Σ represents: a. sample b. population c. sum d. average

c. sum

Measures of dispersion (variation) include the range, variance, and standard deviation. a. True b. False

a. True

Skewed distributions affect measures of central tendency, moving the mean in the direction of the skewness and moving the median between the mean and mode. a. True b. False

a. True

Standard deviation is the square root of the variance. a. True b. False

a. True

The arithmetic mean is the most commonly used measure of central tendency. a. True b. False

a. True

The mode is the most frequently occurring score. a. True b. False

a. True

The terms dispersion, spread, and variation have the same meaning. a. True b. False

a. True

The values of the variance and standard deviation are never negative. a. True b. False

a. True

Variance and standard deviation can be calculated from either ungrouped or grouped data. a. True b. False

a. True

A weighted mean is used if certain components are less significant than others. a. True b. False

b. False

The mean is the middle score in a data set, when scores are arranged in order of magnitude. a. True b. False

b. False

The range is the difference between the midpoint and the largest value. a. True b. False

b. False

The ____ is the midpoint of a distribution, or the point above which 50% of the scores lie, and below which the other 50% lie. a. mean b. median c. mode d. sum

b. median

The mean is computed by adding all the scores in a distribution and ____ by the total number of scores in the distribution. a. squaring b. multiplying c. dividing d. None of the above

c. dividing

The ____ of a set of numbers is the score that occurs with the greatest frequency; that is, the most common value in a data set. a. mean b. median c. mode d. sum

c. mode

Curves that have scores concentrated at either the high or low end of the curve are called ____ curves. a. bimodal b. modal c. symmetrical d. skewed

d. skewed


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