Chapter 5

Question 1

calculated by summing all the values and dividing by the number of observations

Answer 1

Arithmetic mean

Question 2

defines central tendency as the midpoint of the distribution
•the value representing the 50th percentile where half the observations have lower and half higher values
(n+1)/2

Answer 2

median

Question 3

the most common value

Answer 3

mode

Question 4

distributions with two modes

distributions with the modes

Answer 4

Bimodal

Trimodal

Question 5

preferred over a standard mean for variables representing growth (e.g., caseloads, population) or compound interest rates as well as cases with extremely high or low values (outliers)

Answer 5

geometric mean

Question 6

serves averaging rates representing some other average per unit among other variables that are the ratio of two others

Answer 6

harmonic mean

Question 7

equal measure of distribution

Answer 7

symmetric distribution

Question 8

distribution values to the right

Answer 8

positively or right skewed distribution

Question 9

distribution with few extremely low values

Answer 9

negative or left-skewed distribution

Question 10

represent the proportion of observations that fall below and above a value

Answer 10

percentiles

Question 11

value at a given percentile

Answer 11

percentile rank