Chapter 2

Question 1

percentile

Answer 1

percentage of data bellow the amount in question

Question 2

z scores

Answer 2

number of standard deviations from the population mean for a particular point
(value - mean) / standard deviation

Question 3

standard Normal distribution

Answer 3

Normal distribution with a mean of 0 and a standard deviation of 1

Question 4

median of a density curve

Answer 4

divides the area in half; equal areas point

Question 5

mean of a density curve

Answer 5

balance point if it was sold

Question 6

Normal distribution

Answer 6

described by a Normal Curve and specified by its mean (μ) and standard deviation (σ)

Question 7

Standard Normal Table

Answer 7

table of areas under a standard Normal curve

Question 8

density curve

Answer 8

models the distribution of a quantitative variable with a curve that is always on or above the x axis and has an area of exactly 1 underneath it

Question 9

The Empirical Rule

Answer 9

in a Normal distribution with a mean μ and standard deviation σ
approximately 68% of the observations fall within σ of the mean μ
approximately 95% of the observations fall within 2σ of the mean μ
approximately 99.7% of the observations fall within 3σ of the mean μ

Question 10

Normal probability plot

Answer 10

scatterplot of the ordered pair (data value, expected z score) for each of the individuals in a quantitative data set

Question 11

cumulative relative frequency graph

Answer 11

plots a point corresponding to the percentile of a given value in a distribution of quantitive data