elem stats flashcards

No

If we’re z-scoring and it’s saying it’s less than, should we subtract by one?

Yes

If we’re z-scoring and it’s saying it’s greater than one, should we subtract one by?

Inverse Normal

If we’re being asked to find a percentile or a cutoff point, what function do we use?

Convert to decimal (divide by 100)

If using a percent in area of inverse Normal, what do we do?

Norm CDF

If we’re being asked to find probability of a certain number being x, what function do we use?

Yes.

If we’re being asked for normal distribution to binomial, and there’s no mean or standard deviation, should we subtract or add by 0.5?

np

For normal distribution to binomial, how do we find ų if not given?

sqrt(n*p*(1-p)

For normal distribution to binomial, how do we find sigma if not given?

sigma / sqrt(n)

For normal distribution to binomial, what formal needs to be used if mean and standard deviation is included?

Exceeded number

When you came across norm CDF, if mean & SD is given, what do you put as LB?

A huge number

If UB isn’t given, what do you put in?

If the question asks for proportion, use zinterval_1prop

How can we know to use either z-interval_1prop or z-interval?

Binomial PDF

When a question asks to find the probability of exactly x amount within a sample and a percentage, what function do you use?

Binomial CDF

When a question asks to find the probability but it asks greater than, less than, or between x amount within a sample and a percentage, what function do you use?

The claimed mean

For calculating T-test, what do we put in for ų0?

When the sample size is below 30 or population distribution is notmal

When should we use T-interval?

Permutation

What should we use if order matters?

Combination

What should we use if order doesn’t matter?

Yes

If the p-value is greater than alpha is there insufficient evidence?

Yes

If p-value is less than alpha is there sufficient evidence?