A sociologist wishes to estimate the percentage of the United States population living in poverty. What size sample should be obtained if she wishes the estimate the population proportion to be within 2 percentage points with 90% confidence, a) If she uses 1999 estimate of 11.8% obtained from the Current Population Survey. b) She does not use any estimate.

what is the model?

step-by-step explanation:

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true