BA215 W6 Assignment

BA215 W6 Assignment

Assignment Week 6

Question 1

Based on a survey of 1,000 adults by Greenfield Online and reported 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 category 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 was 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           47

65           55

53           59

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.

 

Grading Criteria Assignments     Maximum Points

Meets or exceeds established assignment criteria            40

Demonstrates an understanding of lesson concepts        20

Clearly present well-reasoned ideas and concepts           30

Mechanics, punctuation, sentence structure, spelling that affects clarity, and citation of sources as needed                           10

Total      100