Aresearcher wishes to estimate, with 95% confidence, the population proportion of adults who say chocolate is their favorite ice cream flavor. her estimate must be accurate within 4% of the population proportion.
(a) no preliminary estimate is available. find the minimum sample size needed.
(b) find the minimum sample size needed, using a prior study that found that 38% of the respondents said their favorite flavor of ice cream is chocolate.
(c) compare the results from parts (a) and (b).

a) If no preliminary estimate is available, the minimum sample size needed is 601

b) If 38% of the respondents said their favorite flavor of ice cream is chocolate in a prior survey, then the minimum sample size needed is 566

c) As the proportion estimate gets smaller, minimum sample size needed decreases.

Step-by-step explanation:

The following formula is used to compute the minimum sample size required to estimate the population proportion of adults who say chocolate is their favorite ice cream flavor within the margin of error 4%:

n≥ p×(1-p) × where

(a) When p is not known p is assumed 0.5. Then

n≥ 0.5×0.5× =600.25

(b) if p=0.38 (38%) then

n≥ 0.38×0.62× =565.68

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

step-by-step explanation: