Formulas for unit 3

Question 1

P hat

Answer 1

x/n

Question 2

Point estimate

Answer 2

upper bound + lower bound/ 2

Question 3

Use to check if a p hat distribution is approximately normal

Answer 3

n times p hat multiplied by (1 - p hat) is greater than or equal to 10

Question 4

Margin of error

Answer 4

upper bound = point estimate + E
lower bound = point estimate - E

Question 5

Number of individuals

Answer 5

p hat = x/n
(You will solve for x) (Or multiply p by n)

Question 6

Intervals for p hat

Answer 6

lower bound: p hat - z times the square root of [p hat (1 - p hat)/n]
upper bound: p hat + z times the square root of [p hat (1 - p hat)/n

Question 7

Intervals for confidence intervals

Answer 7

lower bound: x bar - t times s/ the square root of n
upper bound: x bar + t times s/ the square root of n

Question 8

Mew times x bar

Answer 8

= mew

Question 9

mew times p hat

Answer 9

= p

Question 10

sigma times x bar

Answer 10

= sigma/ the square root of n

Question 11

p hat

Answer 11

is the sample proportion

Question 12

sigma

Answer 12

= standard deviation