I just need help with part C the rest are correct A poll showed that 30% of rand

Question

I just need help with part C the rest are correct A poll showed that 30% of randomly surveyed adults in a certain country said their country benefits from having a rich class. Complete parts (a) through (h) below. b. Is the sample size large enough to apply the Central Limit Theorem? Explain. Assume the other conditions for using the CLT are met Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to the nearest integer as needed.) A Yes, the sample size is large enough, since the estimated standard error is .which is greater than or equal to 10. B. Yes, the sample size is large enough, since the expected number of successes is 114 and the expected number of failures is 18 both of which are greater than or equal to 10. C. No the sample size is not large enough, since the estimated standard error is. which is less than 10 D. No, the sample size is not large enough, since the expected number of successes is and the expected number of failures is at least one of which is less than 10. Find a 95% confidence interval for the percent that believe that their county benefits from having a rich class. using the numbers from part(a) The 95% confidence interval is (Round to one decimal place as needed.)

Explanation / Answer

Sample proportion phat=0.38

Sample size n=300

For 95% confidence Interval critical z=1.96

95% confidence interval =phat±z*sqrt(phat*(1-phat)/n)

=0.38±1.96*sqrt(0.38*(1-0.38)/300)

=(0.325                 0.435)

=32.5% to 43.5%

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---