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Test 2
Math 1107
Spring 2007
PROBLEMS 127 ARE MULTIPLE CHOICE AND YOU NEED TO
BUBBLE IN THE ANSWERS ON YOUR TESTING SHEET.
1.
You want to see if more severe crashes occur at the Ford 500 in Talledega since the track has been
resurfaced in the Spring 2006.
What kind of study would you perform?
a.
Survey
b.
Observational Study
c.
Experiment
2.
You want to test if Formula 409, Lysol, or Tylex cleans your shower better.
You divide your shower
into multiple sections to facilitate this comparison.
What kind of study is best to perform?
a.
Survey
b.
Observational Study
c.
Experiment
3.
The makers of Frumpies, “the breakfast of rug rats,” want to improve their marketing, so they consult
you.
They first want to know what percentage of children, ages 10 to 13, like their celeryflavored cereal.
What kind of study should be performed to estimate this percentage?
a.
Survey
b.
Observational Study
c.
Experiment
4.
If you look at the following residual plot, what would you think about the fit of the equation to the
points?
Pick the best answer.
predicted y
a.
The equation fits the data well.
b.
All that is left is random variation.
c.
There is some other variable still yet to be used to explain y.
d.
A and B
e.
B and C
5.
Interpret Rsquared for the following TI83 printout, where x = static weight
and y = weight in motion:
a.
97% of the variation of weight in motion can be explained by static weight.
b.
97% of the variation of static weight can be explained by weight in motion.
c.
93% of the variation of weight in motion can be explained by static weight.
d.
93% of the variation of static weight can be explained by weight in motion.
e.
Rsquared has the same meaning as the correlation.
residuals
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6.
In the printout in #5, the slope is:
a.
–13.669
b.
1.461
c.
.932
d.
.965
7.
The yintercept interpretation for printout in #5 is:
a.
For a static weight of 0, the weight in motion is –13.669 thousands of pounds.
b.
For a weight in motion of 0, the static weight is –13.669 thousands of pounds.
c.
For every 1000 pound increase in static weight, the weight in motion will increase 13.669
thousand of pounds.
d.
For every 1000 pound increase in static weight, the weight in motion will decrease 13.669
thousand of pounds.
e.
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This note was uploaded on 04/18/2008 for the course MATH 1107 taught by Professor Hardy during the Spring '08 term at Kennesaw.
 Spring '08
 Hardy
 Math, Statistics

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