The brand manager for a brand of toothpaste must plan a campaign designed to inc

Question

The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 90% confident that his estimate is within eight percentage points of the true population percentage? Complete parts (a) t (c) below a) Assume that nothing is known about the percentage of adults who have heard of the brand Round up to the nearest integer.) b) Assu me that a recent survey suggests that about 80% of adults have heard of the brand Round up to the nearest integer.) c) Given that the required sample size is relatively small, could he simply suvey the adults at the nearest college? O A. No, a sample of students at the nearest college is a convenience sample. not a simple random sample, so it is very possible that the results would not be representative of the population of adults OB. Yes, a sample of students at the nearest colege is a simple random sample, so the results should be representative of the population of adults OC. No, a sample of students at the nearest college is a cluster sample, not a simple random sample so it is very possible that the results

Explanation / Answer

a)

b)

c)

option A is correct

here margin of error E = 0.08 for90% CI crtiical Z          = 1.645 estimated proportion=p= 0.500 required sample size n =         p*(1-p)*(z/E)2= 106.00

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.