2. The table below contains the amount that a sample of nine customers spent for lunch...

The table below contains the amount that a sample of nine customers spent for lunch ($) at a fast-food restaurant. Complete parts a and b below.

4.26 5.23 5.67 6.28 7.44 7.51 8.25 8.69 9.61

Construct a 99% confidence interval estimate for the population mean amount spent for lunch at a fast-food restaurant, assuming normal distribution.

The % confidence interval estimate is from $____________to $___________

he table below contains a certain social media company's penetration values (the percentage of a country's population that use this social media) for 14 countries. Complete parts a through c below.

a. Construct a 95% confidence interval estimate for the population mean social media penetration.The 95% confidence interval estimate is from

4. In a survey of 2,442 website users, 1,871 cited "seeing photos or videos" as a major reason why they use a website, while 1,233 cited "keeping up with news and current events" as a major reason why they use a website. Complete parts (a) through (c) below.

Construct a 95% confidence interval estimate for the population proportion of website users who cited "seeing photos or videos" as a major reason why they use a website.

5. If the manager of a bottled water distributor wants toestimate, with 95% confidence, the mean amount of water in a1-gallon bottle to within ±0.003 gallons and also assumes that the standard deviation is 0.05 gallons, what sample size isneeded?

n=?

6.In a study of 402 nonprofits nationwide, 80 indicated that turnover has been the biggest employment challenge at their organization. Complete parts (a) through (c).

Construct a 95% confidence interval for the population proportion of nonprofits that indicate turnover as the biggest employment challenge at their organization.

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