How's the economy? A pollster wants to construct a confidence interval for the proportion of adults who believe that economic conditions are getting better. Part: 0 / 20 of 2 Parts Complete Part 1 of 2 (a) A poll taken in July estimates this proportion to be . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of ? A sample of adults is needed to obtain a confidence interval with a margin of error of .

Complete Question

The complete question is shown on the first uploaded image

a

The sample size is

b

The sample size is

Step-by-step explanation:

From  the question we are told that

   The proportion is mathematically represented as  

    The marginal error is  

     The confidence level is  95 %  = 0.95

The z-value of the confidence level is

This value is obtained from the z table

     The sample size is mathematically evaluated as

substituting values

If no estimate is available the let assume  

     So  

substituting values

too many. (jk)

31 v bucks

step-by-step explanation:

since you bought 25 on friday and 6 on tuesday, you can just add them up.

25+6=31

check your work.

31-6=25

i hope this !

-yand3r3