A survey of 672 audited tax returns showed that 448 resulted in additional payments. Construct a 95 percent confidence interval for the true percentage of all audited tax returns that resulted in additional payments.

A genetic experiment with peas resulted in one sample of offspring that consisted of 475 green peas and 193 yellow peas. Find the margin of error that corresponds to a 94% confidence level of yellow peas. Round to the tenths place of a percent-do not enter the % symbol. Show formulas Enter the numerical answer to the correct decimal places

A political science professor wants to determine her students’ attitude toward a presidential executive order preventing the construction of the Keystone Natural Gas pipeline.  She has a sample of 50 students complete an interval level, 7-point scale assessing their attitude toward the policy where 1 = highly unfavorable 2= moderately unfavorable, 3 =  slightly unfavorable, 4 = neutral, 5 = slightly favorable, 6 = moderately favorable, 7 = highly favorable.   The sample mean is 4.6 with a standard deviation  of  1.2. Using α = .01 what can she conclude regarding her students’ attitude toward the policy?

Suppose that Kim is a participant in a study that compares several coaching methods to see how they affect math Scholar Aptitude Test (SAT) scores. The grand mean of math SAT scores for all participants (My) in the study is 550. The group that Kim participated in had a mean math SAT score of 565. Kim’s individual score on the math SAT was 610. What was the estimate residual component (of Kim’s score, that is, the part of Kim’s score that was not related to the coaching method? (Both parts of this question call for specific numerical values as answers). What was that “effect” (ai) component of Kim's score? What pattern in grouped data would make SSwithin = 0? What pattern within data would make SSbetween = 0?

Suppose that there is a 15% chance that a randomly selected Stat 240 student wears glasses. Out of a class with 35 students, what is the minimum number of students wearing glasses for the percent to be considered unusually high?   Thanks!

Why would manufacturers or businesses be interested in constructing a confidence interval for the population measure?  Would manufacturers or businesses want large or small margins of error?

If the confidence interval would only contain positive values, what would be your interpretation of this 95% confidence interval regarding this diet program?