Chapter 3

Question 1

3 aspects to a quantitive variable

Answer 1

Shape
Center - the middle of the distribution
Spread - variation or dispersion of the distribution

Question 2

Population distribution

Answer 2

he distribution of population data

Question 3

Sample distribution

Answer 3

the distribution of sample data, If you take several samples from the same population, every sample will have a slightly different
shape or distribution. The larger the sample size, the better will be its approximation to the population distribution

Question 4

Symmetrical

Answer 4

a distribution that can be divided into two parts such that one is a mirror image of the
other

Question 5

Skewed

Answer 5

distribution that has one tail of the distribution longer than the other (therefore not symmetrical)

Question 6

Left Skewed

Answer 6

Negative, left tail is longer than right tail

Question 7

Right Skewed

Answer 7

Positive, right tail is longer than left tail

Question 8

J-Shaped

Answer 8

special type of negatively skewed distribution that has no right tail (vice versa for Reverse J-Shape)

Question 9

Modality

Answer 9

Refers to the number of peaks in the distribution

Question 10

Unimodal

Answer 10

one peak (or one mode)
All of the above distributions are unimodal

Question 11

Bimodal

Answer 11

two peaks
(the two peaks are approximately the same height, otherwise it is unimodal with an irregular shape)

Question 12

Multimodal

Answer 12

three or more peaks

Question 13

Median

Answer 13

the middle observation in a distribution

Question 14

Median class

Answer 14

the class in a frequency distribution in which the median is found

Question 15

Mode

Answer 15

one or more points in a frequency distribution that have the greatest frequency

Question 16

Range

Answer 16

Max – Min = difference between the highest and lowest observations in a data set
* A biased measure of variation

Question 17

Percentiles

Answer 17

divide a data set into 100 equal parts

Question 18

Deciles

Answer 18

divide a data set into 10 equal parts

Question 19

Quartiles

Answer 19

divide a data set or distribution into 4 equal parts

Question 20

First quartile

Answer 20

the median of that part of the data set that lies below the median of the entire data set

Question 21

Second Quartile

Answer 21

the median of the entire data set

Question 22

Third Quartile

Answer 22

the median of that part of the data set that lies above the median of the entire data set

Question 23

Interquartile range

Answer 23

Q3 - Q1

Question 24

5 Numba Summa

Answer 24

Five-Number Summary = Min, Q1, Q2, Q3, Max

Question 25

Adjacent Values

Answer 25

Min and Max