Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0   2 32 34 -2   3 24 25 -1   4 28 30 -2   5 26 29 -3     Calculate the Upper 95% Confidence Interval (of the difference).   (round to 2 decimal places)

A sample of 1200 females and 1000 males found that 78.3% of females and 35.1% males supported increased funding of arts.   Construct a 90% confidence interval around the difference in proportions.

I want to estimate the population mean number of times that adults eat breakfast in a week. I spoke with 12 coworkers, and the numbers were 7, 5, 5, 7, 2, 3, 7, 5, 1, 0, 7, 6. Calculate a 95% confidence interval for the population mean (round 3 decimal places).

What impact does fast-food consumption have on various dietary and health characteristics? A research article reported the accompanying summary statistics on daily calorie intake for a representative sample of teens who do not typically eat fast food and a representative sample of teens who do eat fast food. Construct a 95% confidence interval estimate of the difference in mean daily calorie intake for teens who do eat fast food on a typical day and those who do not.

Researchers are studying whether the proportion of homeschooled children in district 1 (considered 1) is less than the proportion of homeschooled children in neighboring district 2 (considered as 2). To test the theory info was gathered: district 1 had 600 students of which 90 were homeschooled. District 2 had 550 students of which 99 were homeschooled. What is the 95% confidence interval for the difference proportion between district 1 and 2? A. (-0.086, 0.026) B. (0.143, 0.217) C. (0.113, 0.187)

Kmart decided to inventory all of its furniture stock for a year end evaluation. At that time there were 768 items of furniture. A random sample of 40 items of furniture were selected for​ audit, with sample mean=$249.06 and SD=$92.58. Construct a 95% confidence interval estimate of the total value of furniture stock for year end.

In a study of speed​ dating, male subjects were asked to rate the attractiveness of their female​ dates, and a sample of the results is listed below ​(1=not ​attractive; 10=extremely ​attractive). Construct a confidence interval using a 90​% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult​ females?   7​, 7​, 3​, 8​, 4​, 5​, 7​, 7​, 7​, 10​, 5​, 9