Exam One

Question 1

Inferential statistics

Answer 1

Prediction of the population that uses information gathered from the sample

Question 2

Descriptive Statistics

Answer 2

Numerical summary of the sample

Question 3

Standard deviation

Answer 3

Spread or dispersion of the data. Tells distance of other observations in data around mean

Question 4

Symmetric Data

Answer 4

Mean and median are equal

Question 5

Negative Skew

Answer 5

Mean < median < mode

Question 6

Positive Skew

Answer 6

Mode < median < mean

Question 7

Empirical rule

Answer 7

For symmetric distributions, 95% of the data is between 2 standard deviations of the mean

Question 8

Statistical Independence

Answer 8

When the occurrence of 1 event doesn’t affect the chances of other events

Or: P(A and B) = P(A)P(B)

Question 9

Finding ‘and’ probabilities

Answer 9

Multiply the probabilities

Question 10

Finding ‘or’ probabilities

Answer 10

P(A) + P(B) - P(A&B)

Question 11

Permutation

Answer 11

Elements of a subset are listed in a specific order

Question 12

Combination

Answer 12

Elements of the subset can be listed in any order

Question 13

Factorial

Answer 13

Product of an integer and all the integers below it
Ex: factorial four (4!) = 24