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A questionnaire on the issue of substance abuse problems was mailed to all XYZ city businesses. Of the 72 businesses that responded to the survey, 54 admitted that they had employees whose performance was affected by substance abuse.
(a) Using the sample data, compute a 95% confidence interval for the proportion of all XYZ city businesses with substance problems.
(b) What is the margin of error? Explain its meaning.
(c) Interpret the confidence interval in (a).
Arbitron Media Research Inc, conducted a study of the radio listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for men was 35 minutes per day.
a) Compute the expected number of withdrawals b) Compute the probability that exactly four will withdraw c) Compute the probability that more than three will withdraw d) Compute the probability that two or fewer will withdraw
You run a two tail t-test. The critical value for this test at the .05 level is a t of 7.82. What value must the obtained t-test statistic be in order to be considered significant at the .05 level?
The height in inches of girls on a high school girls basketball team are as follows: Identify the z score used in a quantile plot for the player with a height of 66.5 inches.
Find the predicted compensation and the residual prediction error for the CEO of Netflix, expressing both quantities in dollars.
1. Define an isomer. When considering isomers, what structural differences make molecules isomers?
1. Describe the distribution of the two variables of interest - gender and test scores - using a graphing technique and/or appropriate measures of central tendency and variability.
Of 880 respondents, 171 admitted that at least one light had been red. Follow four-step process to create 95% confidence interval.
Disjoint or independent? In Exercise you calculated probabilities of getting various M&M's. Some of your answers depended on the assumption.
Find the gross earnings of a salesperson who has total sales of $23,600. (No commission is paid on the first $15,000 of sales.)
Copy the Assignment Data (i.e., cake mix data) to Sheet 1, cells A1:P32, of the new Excel workbook. Enter the following labels in cells A34:A36: Point Estimate, Lower bound of the 95% Confidence Interval, and Upper Bound of the 95% Confidence Inter..
You are asked to estimate the chance that the sum will be positive. Can you do it if you are also told the average and SD of the numbers in the box, but are not told the numbers themselves?
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