a)
0.000
b)
0.358
c)
0.116
d)
0.942
e)
0.058
Question 15
Your answer is CORRECT.
This is a written question, worth 10 points. DO NOT place the problem code on the answer sheet. A
proctor will fill this out after exam submission. Show all steps (work) on your answer sheet for full
credit.
Problem Code: 1521
A study of iron deficiency in infants compared samples of infants whose mothers chose different ways of
feeding them. One group contained breastfed infants. The children in another group were fed a standard
baby formula without any iron supplements. Her are summary results on blood hemoglobin levels at 12
months of age:
Group
n
x
s
Breastfed
27
15.3
2.2
Formula
33
16.9
1.9
Part a
: We want to see if the mean hemoglobin level is greater among formulafed babies. State the
hypotheses and perform the significance test on your hypothesis. Report the test statistic and pvalue. State
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12/9/2016
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7/9
your conclusion in terms of the issue.
Part b
: Give a 95% confidence interval for the mean difference in hemoglobin level between the two
populations of infants.
a)
I have placed my work and my answer on my answer sheet.
b)
I want to have points deducted from my test for not working this problem.
Question 16
Your answer is CORRECT.
This is a written question, worth 10 points. DO NOT place the problem code on the answer sheet. A
proctor will fill this out after exam submission. Show all steps (work) on your answer sheet for full
credit.
Problem Code: 1671
Consumer Reports rated 77 cereals on a scale of 0 to 100. The number of grams of sugar contained in each
serving of the corresponding cereals was also recorded. Using sugar as the explanatory variable and the
Consumer Reports rating as the dependent variable, computer output of the data is as follows (the pvalues
are intentionally left blank):
Predictor
Coef
StDev
T
P
Constant
59.28
1.948
30.43
Sugars
− 2.41
0.24
− 10.12
S = 9.146
RSq = 57.7%
RSq(adj) = 57.1%
Part a:
What is the regression equation?
Part b:
Calculate the 95% confidence interval of the slope of the regression line for all cereals.
Part c:
Use the information provided to test whether there is a significant relationship between the sugar
content and the Consumer Report rating at the 5% level.
a)
I have placed my work and my answer on my answer sheet.
b)
I want to have points deducted from my test for not working this problem.
Question 17
Your answer is CORRECT.
This is a written question, worth 10 points. DO NOT place the problem code on the answer sheet. A
proctor will fill this out after exam submission. Show all steps (work) on your answer sheet for full
credit.
