loanyst7513

14.04.2020 • 

Mathematics

The customer relations department will survey a random sample of customers and compute a 95% confidence interval for the proportion that are dissatisfied. From past studies, they believe that this proportion will be about 0.28. Find the sample size needed if the margin of error of the confidence interval is to be no more than 0.02.

Ответ:

falldownguyss

19.07.2021

Mathematics

---

Part B: 45 minutes

Step-by-step explanation:

x+y=75

y= -x+75

-x   -x  

y+15=x

-x+75+15=x

90/2=2x/2

x=45  

y+15=45  

-15  -15

y=30

---

0,0(0 оценок)