Stats Chapter 3 T F

Front 1

1. A value that is typical or representative of the data is referred to as a measure of central location.

Back 1

TRUE

Front 2

2. The arithmetic mean is the sum of the quantitative observations divided by the total number of observations.

Back 2

TRUE

Front 3

3. For a set of data arranged or sorted in numerical order, the value of the observation in the center is called the weighted mean.

Back 3

FALSE

Front 4

4. A set of ordinal, interval or ratio level data may only have one mode.

Back 4

FALSE

Front 5

5. The mode is the value of the observation that appears most frequently.

Back 5

TRUE

Front 6

6. Extremely high or low scores affect the value of the median.

Back 6

FALSE

Front 7

7. The sum of the deviations from the mean for the set of numbers 4, 9 and 5 will equal zero.

Back 7

TRUE

Front 8

8. Three persons earn $8 an hour, six earn $9 an hour, and one earns $12 an hour. The weighted mean hourly wage is $9.

Back 8

TRUE

Front 9

9. For any distribution, there are an equal number of values above and below the mean.

Back 9

FALSE

Front 10

10. The geometric mean is the nth root of n observations.

Back 10

TRUE

Front 11

11. Dispersion describes the degree of variation in the data.

Back 11

TRUE

Front 12

12. The mean deviation is the difference between the mean or the deviations and the arithmetic mean.

Back 12

FALSE

Front 13

13. The variance is the mean of the sum of the squared deviations between each observation and the median.

Back 13

FALSE

Front 14

14. The standard deviation is the positive square root of the variance.

Back 14

TRUE

Front 15

15. For any data set, Chebyshev's Theorem estimates the proportion of observations that occurs within k standard deviations of the mean, where k is greater than 1.0.

Back 15

TRUE

Front 16

16. In a company, the standard deviation of the ages of female employees is six years and the standard deviation of the ages of male employees is ten years. These statistics indicate that the dispersion of age is greater for females than for males.

Back 16

FALSE

Front 17

17. According to Chebyshev's Theorem, 75% percent of the observations lie within plus and minus 2.00 average mean deviations.

Back 17

FALSE

Front 18

18. According to the Empirical Rule, 75% percent of the observations lie within plus and minus 2.00 average mean deviations.

Back 18

FALSE