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Question 1 - Based on a survey of 1,000 adults by Greenfield Online and resported in a May 2009 USA Today Snapshot, adults 24 years of age and under spend a weekly average of $35 on fast food. If 200 of the adults surveyed were in the age catetory of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
Question 2 - An experiment ws designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were littermates. The rations were assigned at random to the two animals within each pair. The gains (in pounds) after 45 days are shown below:
RationA
RationB
65
58
37
39
40
31
47
45
49
55
53
59
51
Assuming weight gain is normal, find the 95% confidence interval estimate for the mean of the differences μd where d= ration A - ration B.
a data set consists of 72 test scores. over a long period it has been found that the mean and standard deviation for
Can you conclude that engineers follow an accident profile that is different from the rest of the drivers in the region?
30% of households say they would feel secure if they had $50,000 in savings. you randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings. find the probability that the number that say they would feel secu..
What are three lessons you learned relative to ANOVA and nonparametric tests? As a result of using this simulation, what concepts and analytic tools will you be able to use in your workplace (i.e., how do you expect to apply what you learned)?
Why do we do power calculations with single sample z test? A) Because we can use Z area tables to calculate the power. B) Because comparing a sample mean against a population mean is very powerful
A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
Construct confidence intervals for the estimates of the slope coefficients in (i) to (iii) of Question 3. Explain the meaning of these confidence intervals and comment on your results about the width of the confidence intervals, if sample size inc..
Determine the 95 percent confidence interval and the 95 percent prediction interval for the selling price of a home with 2,200 square feet.
Physical stores face increasing competition from online rivals. To compete, a campus bookstore collected data on sales of newly released trade books dis- played on shelving near the store entrance. These data give weekly sales per week of trade bo..
Department members are expected to vote independently and with no prior consultation. What are the candidate's chances of getting the position?
question 1 you wish to conduct an anova one wayomnibus. in order to insure you have enough power to detect differences
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average $72 a day in tips." Assume the population of daily tips is normally distributed with a standard deviation of $2.45.
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