Stats

Question 1

A n B

Answer 1

Intersection

Question 2

A U B

Answer 2

Union

Question 3

P(A|B) =

Answer 3

P(A|B’) = P(A)

Question 4

P( A U B ) =

Answer 4

P(A) + P(B) - P(AnB)

Question 5

P(B|A)

Answer 5

P( B n A) / P(A)

Question 6

Standard normal distribution mean and standard deviation

Answer 6

Mean = 0
Standard deviation = 1

Question 7

sample mean of a normally distribute random variable X ~ N(u , ó^2 / n)

Answer 7

Z = ( X - u) / ( ó / root n )
with Z ~ N( 0, 1)

Question 8

Population

Answer 8

Set of items that are of interest

Question 9

Census

Answer 9

Observes or measured every member of a population

Question 10

Sampling units

Answer 10

Individual units of population

Question 11

Sampling frame

Answer 11

Sampling units individually named or numbered to form a list

Question 12

Simple random sample

Answer 12

Size of n is one where every sample of size n has an equal chance of being selected

Question 13

Systematic sampling

Answer 13

Required elements are chosen at regular intervals from an ordered list

Question 14

Stratified sampling

Answer 14

Population is divided into mutually exclusive strata and a random sample is taken from each

Question 15

Quota sampling

Answer 15

Interviewer or researcher selects a sample that reflects the characteristics of the whole population

Question 16

Opportunity sampling

Answer 16

taking the sample from people who are available at the time the study is carried out and who fit the criteria you are looking for

Question 17

Continuous variable

Answer 17

Any valuable in given range

Question 18

Discrete variable

Answer 18

Set values in a specific range

Question 19

Outliers

Answer 19

Q3 + k(Q3 - Q1)
Q1 - k(Q3-Q1)

Question 20

What is cleaning the data

Answer 20

Removing the anomalies

Question 21

What is the vertical scale on histogram

Answer 21

Frequency density = frequency / class width

Question 22

Bivariate data

Answer 22

Pairs of values for two variables

Question 23

Regression line

Answer 23

Y = a + bx

Question 24

Mutually exclusive

Answer 24

P( A or B) = P(A) + P(B)

Question 25

Independent events

Answer 25

P(A and B) = P(A) x P(B)

Question 26

What happens if test statistic falls within critical region

Answer 26

Reject null hypothesis

Question 27

What is critical value

Answer 27

first to Fall inside of the critical region

Question 28

What is the actual significance level of a hypothesis test

Answer 28

probability of incorrectly rejecting null hypothesis