11. The United States has about 320 million residents. Suppose you want to estim

Question

11. The United States has about 320 million residents. Suppose you want to estimate the proportion of Americans who prefer to bathe/shower in the mornings to within a margin-of-error of 3 percentage points with 95% confidence. If all contacted people respond, roughly how many people would you need to randomly sample? Select the best answer. Select one: 300,000 O 1500 O 1,000,000 12. (a) If all else remains the same, as the sample size increases, the p-value in a test of significance (b) Ifall else remains the same, as the sample variability increases, the p-value in a test of significance (c)When you are testing whether two population means are the same, as the sample means get further apart, the p-value (d) If all else remains the same, as the F-statistic gets larger, the p-value , if all else remains the same. 13. Suppose that you take a random sample of 200 houses currently for sale in Virginia. Does the Central Limit Theorem indicate that a histogram of the house prices in the sample will display an approximately normal distribution? Explain briefly. 14 Suppose a representative survey indicates that 75% of undergraduate students at Virginia Tech own an iPhone and 60% of graduate students at Virginia Tech own an iPhone. the average of 75% and 60% of all students at Virginia Tech undergraduate and graduate students combined) o n an iPhone? Briefly explain why or why not. Is it reasonable to conclude that 67.5%

Explanation / Answer

11.

sample size should be approximately 1050 i.e. option C

12.
a) p-value decreases

b) p-value increases

c) p-value increases

d) p-value decreases

Given CI Level 95% p 0.5 ME 0.03 z-value of 95% CI 1.9600 n = (z/ME)^2*p*(1-p) 1067

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

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