Flashcards in Probability and Statistics Deck (27)

Loading flashcards...

1

## What is one easy way to solve permutations?

### Fundamental Counting Principle

2

## What is an ordering of n objects?

### Permutations

3

## What does n! mean?

### n times all the whole numbers less than it.

4

## What is n! called?

### n factorial

5

## How is the number of permutations of r object taken from a group of n distinct objects denoted?

### nPr

6

## What is the formula for nPr?

### n! / (n-r)!

7

## What is a selection of object from a group, where order is NOT important?

### Combination

8

## What does n stand for (nPr or nCr)?

### Total number of objects.

9

## What does r stand for (nPr or nCr)?

### Number to be chosen.

10

## What is the formula for nCr?

### n! / r! (n-r)!

11

## What is the mean?

### Average

12

## What does σ stand for?

### Standard deviation

13

## What does x̅ stand for?

### Mean

14

## Besides mean, what are other measures of tendency?

### Median and mode

15

## What do variance and standard deviation show?

### How much data values deviate from the mean of the data set.

16

## When looking at data variation, if there are small values the data will be

### close together.

17

## When looking at data variation, if there are larger values, the data will be

### spread out.

18

## What is σx^2?

### Variance

19

## What is a function that gives the probability of each outcome in a list of possibilities?

### Probability distribution

20

## What has data that vary randomly from the mean?

### Normal distribution

21

## What is the graph of a normal distribution called?

### Normal curve

22

## In a normal distribution: what percent of data fall within one standard deviation of the mean?

### 68%

23

## In a normal distribution: what percent of data fall within two standard deviations of the mean?

### 95%

24

## In a normal distribution: what percent of data fall within three standard deviations of the mean?

### 99.7%

25

## A normal distribution has a symmetric ____ shape centered on the ____.

###
bell

mean

26

## Sometimes an extraordinary factor affect data that would otherwise be normal, making it a ______ ____________.

### skewed distribution

27