Chapter 1

Question 1

Categorical Variable

Answer 1

places each case into one of several groups, or categories.

Question 2

Quantitative variable

Answer 2

takes numerical values for which arithmetic use

Question 3

Types of Categorical Variable graphs?

Answer 3

Pie Chart and Bar Graph

Question 4

Types of Quantitative variable graphs?

Answer 4

Histogram and Stemplot

Question 5

What do we look for in graphs?

Answer 5

Shape, Center and Spread. Sometimes outlier

Question 6

What is mean?

Answer 6

The average of the whole data set

Question 7

What is Median?

Answer 7

The midpoint value of the data set when arranged from smallest to greatest

Question 8

What happens when distrubution is symettric

Answer 8

Mean and Median share close values

Question 9

What happens in a skewed distribution?

Answer 9

The mean is usually farther out in the long tail than median

Question 10

What is IQR Formula?

Answer 10

Q3 - Q1

Question 11

What is 5 number summary?

Answer 11

Min Q1 M Q3 Maximum

Question 12

What is a Quartile 1?

Answer 12

The median of observations located to the left of the primary median

Question 13

When do we use Standard Deviation?

Answer 13

Measure spread of the mean and only when mean is used as a center point

Question 14

Is ‘s’ resistant to outliers?

Answer 14

NO

Question 15

Rules of the density curve?

Answer 15

Always above the horizontal axis and has an area of exactly 1

Question 16

What does mean represent on density curve?

Answer 16

It is the balance point or where slope is zero

Question 17

What does median represent on density curve?

Answer 17

The area taht divides the area of the curve in half

Question 18

What is normal curve?

Answer 18

Mean of Normal distribution

Question 19

What is standard deviation?

Answer 19

Distance from center of curve to either side

Question 20

What is a Normal Quantile Plot”?

Answer 20

Shows through a linear relation if the distribution is normal