CH3 - Numerical Measures

Question 1

Numerical value used as a summary measure for a sample

Answer 1

Sample Statistics

Question 2

Numerical value used as a summary measure for a population

Answer 2

Population Parameter

Question 3

Sample statistic used to estimate the corresponding population parameter

Answer 3

Point Estimator

Question 4

A measure of central location computed by summing the data values and dividing by the number of observations

Answer 4

Mean

Question 5

The mean obtained by assigning each observation a weight that reflects its importance

Answer 5

Weighted Mean

Question 6

A measure of central location provided by the value in the middle when the data are arranged in ascending order

Answer 6

Median

Question 7

A measure of location that is calculated by finding the nth root of the product of n values

Answer 7

Geometric mean

Question 8

Measure of location, defined as the value that occurs with greatest frequency

Answer 8

Mode

Question 9

Value such that at least p percent of the observations are less than or equal to this value. The 50th percentile is the median

Answer 9

Percentile

Question 10

25th, 50th, 75th percentiles are referred to as…

Answer 10

Quartiles

Question 11

A measure of variability, defined to be the largest value minus the smallest value

Answer 11

Range

Question 12

Measure of variability, defined to be the difference between the third and first quartiles

Answer 12

Interquartile range

Question 13

Measure of variability based on the squared deviations of the data values about the mean

Answer 13

Variance

Question 14

Measure of variability computed by taking the positive square root of the variance

Answer 14

Standard Deviation

Question 15

Measure of relative variability computed by dividing the standard deviation by the mean and multiplying by 100

Answer 15

Coefficient of variation

Question 16

Shape of a data distribution. Negative to the left, positive to the right

Answer 16

Skewness

Question 17

Computed by dividing the deviation about the mean(xi - x) by the standard deviation s

Answer 17

z-score

Question 18

Used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean

Answer 18

Chebyshev’s theorem

Question 19

Rule used to compute the percentage of data values that must be within one, two, and three standard deviations of the mean for data that exhibit a bell-shaped distribution

Answer 19

Empeirical rule

Question 20

Unusually small or large data value

Answer 20

Outlier