Equations

Question 1

Linear transformations

Answer 1

Adding “a” to every member of a data set adds “a” to the measures of position but does NOT change the measures of spread

Multiplying every member of a data set by “b” multiplies the measures of position by “b” and multiplies most measures of spread by |b| but does NOT change the shape

Question 2

Using Normcdf and InvNorm

Calc tips

Answer 2

Using boundaries to find area normcdf(min, max, mean, sd)

Using area to find boundaries
Invnorm(area to left as a decimal, mean, sd)

Question 3

What’s a residual

Eq too

Answer 3

Residual= y - y hat (actual - predicted)

A residual measures the difference between the actual and predicted y value that’s predicted by the LSRL

Question 4

Paired t test identification hints Ho and Ha

Answer 4

Key phrase: mean difference

Two lists of numbers are paired
Ho: mean dif = 0
Ha: mean dif , not equal to

Mean dif = the true mean difference in ___

Question 5

Conditional probability

Answer 5

Probability that one event occurs given that another event is already known to have occured

Question 6

Outlier rule

Answer 6

Upper cutoff = Q3 + 1.5(IQR)

Lower cutoff = Q1 - 1.5(IQR)

IQR = Q3 - Q1

Question 7

Two events are mutually exclusive if

Answer 7

P(A and B) = 0

Events A and B are mutually exclusive if they share no outcomes

Question 8

Two events are independent if

Answer 8

Events A and B are independent if knowing that Event A has occurred or not, doesnt change the probability that Event B occurs