Probability and Statistics

Question 1

What is one easy way to solve permutations?

Answer 1

Fundamental Counting Principle

Question 2

What is an ordering of n objects?

Answer 2

Permutations

Question 3

What does n! mean?

Answer 3

n times all the whole numbers less than it.

Question 4

What is n! called?

Answer 4

n factorial

Question 5

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

Answer 5

nPr

Question 6

What is the formula for nPr?

Answer 6

n! / (n-r)!

Question 7

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

Answer 7

Combination

Question 8

What does n stand for (nPr or nCr)?

Answer 8

Total number of objects.

Question 9

What does r stand for (nPr or nCr)?

Answer 9

Number to be chosen.

Question 10

What is the formula for nCr?

Answer 10

n! / r! (n-r)!

Question 11

What is the mean?

Answer 11

Average

Question 12

What does σ stand for?

Answer 12

Standard deviation

Question 13

What does x̅ stand for?

Answer 13

Mean

Question 14

Besides mean, what are other measures of tendency?

Answer 14

Median and mode

Question 15

What do variance and standard deviation show?

Answer 15

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

Question 16

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

Answer 16

close together.

Question 17

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

Answer 17

spread out.

Question 18

What is σx^2?

Answer 18

Variance

Question 19

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

Answer 19

Probability distribution

Question 20

What has data that vary randomly from the mean?

Answer 20

Normal distribution

Question 21

What is the graph of a normal distribution called?

Answer 21

Normal curve

Question 22

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

Answer 22

68%

Question 23

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

Answer 23

95%

Question 24

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

Answer 24

99.7%

Question 25

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

Answer 25

bell

mean

Question 26

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

Answer 26

skewed distribution

Question 27

To find the probability of a value being between two given values on a calculator, hi the _____ menu and chows _________(.

Answer 27

DISTR

normalcdf