Chapter 4 - Numerical Methods For Describing Data

Question 0

A typical unknown fixed value about a population

Answer 0

Parameter

Question 1

Value calculated from a sample

Answer 1

Statistic

Question 2

The middle value of the data; it divides the observations in half

Answer 2

Median

Question 3

The arithmetic average

Answer 3

Mean

Question 4

The _____ of the distribution because it _____ the positive and negative deviations

Answer 4

Balance point and balances

Question 5

In a symmetrical distribution, the mean and median are ____

Answer 5

Equal

Question 6

In a skewed distribution, the mean is pulled in the __________

Answer 6

Direction of skewness

Question 7

Largest observation - smallest observation

Answer 7

Range

Question 8

The square root of variance

Answer 8

Standard deviation

Question 9

of independent observations

Answer 9

Degrees of freedom

Question 10

The range of the middle half of the data

Answer 10

Interquartile range ( IQR )

Question 11

The median of the lower half of the data

Answer 11

Lower quartile ( Q1 )

Question 12

The median of the upper half of the data

Answer 12

Upper quartile ( Q3 )

Question 13

When adding a constant to a random variable the _____ changes but not the standard deviation

Answer 13

Mean

Question 14

When multiplying a constant to a random variable the ____ and the ____ ____ changes

Answer 14

Mean and standard deviation

Question 15

Five number summaries

Answer 15

Minimum value
1st quartile 
Median 
3rd quartile
Maximum value

Question 16

Tells us how many standard deviations the value is from the mean

Answer 16

Z-score

Question 17

Z-score

Answer 17

Standard deviation

Question 18

Is a value in the data set where r percent of the observations fall AT or BELOW that value

Answer 18

Percentile