STATS exam 2 flashcards

what are Z-scores ?

they indicate how many standard deviations value is away from the mean

What is the equation for Z-scores?

parameter mean

mean value of an entire group under the study (usually over periods of time)

parameter proportion

percentage of population that meets a certain criterion or test (usually whether or not questions)

how do you determine when you can reject H₀ ?

value must be less than the a

what are conditions for inference?

sample size must be greater than 30

what does H₀ stand for?

What does H_A stand for?

how big should p have to be have a right skewed graph?

small or <50

how big should p have to be to be left skewed?

large >50

what must you do to the sample size to decrease the margin of error?

increase sample size

whats the Z* for 90%?

1.64

What’s the a for 90%?

0.10

What’s the z* for 95%?

1.96

what’s the a for 95%?

0.05

what’s the z* for 99%?

2.57

what’s the a for 99%?

0.01

what’s a type I error?

What’s a type II error?

What’s a type III error?