STT. Exam 3

Question 1

SD formula for 7.2:

Answer 1

sigma/square root of n

Question 2

z-score formula for 7.2:

Answer 2

x-bar - mu/ sigma over the square root of n

Question 3

Central Limit Theorem (CLT):

Answer 3

the larger the population/sample size, the smaller the spread and the more the graph line represents a bell-curve shape, getting closer to normal distribution.

Question 4

MOE, “m”:

Answer 4

margin of error
p-hat +or- z-star x square root p-hat (1-p-hat) over n

Question 5

if sigma/standard deviation is NOT known, use:

Answer 5

the t-star formula

Question 6

how to find standard error:

Answer 6

sigma/square root of n

Question 7

sample size for p (p-hat) point estimate:
MOE:
C.I.:

Question 8

sample size for mean (x-bar) CASE 1 (when SD is known)
point estimate:
MOE:
C.I.:

Question 9

if no information is provided for a proportion, p-hat =

Answer 9

0.5

Question 10

sample size for x-bar CASE 2 (when SD is unknown)
point estimate:
MOE:
C.I.:

Question 11

when finding sample size, use:

Answer 11

inference proportion app

Question 12

calculating test statistic:

Answer 12

z-score of p-hat
formula…