Business Statistics Grantham University : My Essay Gram

**I need this tomorrow (Tues, 18 Mar) by noon.  Can you please explain your answers and show the equations?

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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 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.

 

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