A telephone poll of 818 adult Americans was reported in an issue of Time Magazine. One of the questions asked was, "What is the main problem facing the country?" Thirty-nine percent answered, "crime." Construct a 93% confidence interval for the population proportion of Americans who feel that crime is the main problem. p'= α2= zα2= Margin of Error: E= We are 93% confident that the proportion of Americans who feel that crime is the main problem is between___ and___ .

A sociologist is comparing the proportion of teenage boys who receive a text message at least once an hour to the percentage of teenage girls who do.  She has collected data from 150 men and 150 women.  Which of the following is not a condition that the sociologist should check before creating a confidence interval for the difference in population proportions?

A survey of 32,782 adults in 2004 indicated that 24.6% of adults were current smokers. A similar study conducted in 1995 of 40,000 adults indicated that 29.7% were current smokers. a. Find and interpret a point estimate of the difference between the proportion of current smokers in 1995, and the proportion of current smokers in 2004. b. A 95% confidence interval for the true difference is (-0.058,-0.045). Interpret. c. What assumptions must you make for the confidence interval i part b to be valid? (…) a. Find a point estimate of the difference between the proportion of current smokers in 1995 and the proportion of current smokers in 2004. (Round to three decimal places as needed.)

you conducted additional studies with these men and found the following: a. The RR for those who drank one drink per day was 1.50 (95% CI:1.32-1.67) in comparison to the abstainers. b. For those men who drank three or more drinks per day the RR compared to the abstainers was 4.20 (95% CI 2.68-5.85).  Question:  We can tell from the Confidence Intervals provided in #7 whether there are likely more people in the “one drink a day” group or the “3+ drinks per day” group. Which one likely has more people and how can we tell?

8.2 question 5).  In 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the assassination of President Kennedy and found that 634 believe there was a conspiracy ("Gallup news service," 2013). Estimate the proportion of American’s who believe in this conspiracy using a 98% confidence interval.

Construct a 99.5% confidence interval for the difference m1-m2 when x bar 1=481.49, x bar 2 = 324.67, s2=28.30, n1= 20, and n2=24. Use the ti 84 calculator and round the answers to two decimal places. A 99.5% confidence interval for the difference in the population means is ?

Identify the t score for a 99% confidence interval if the sample size is 35 t=

Can you help me with this question from my Business Statistics class?