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90 Answer Key/STATISTICS USING THE SHARP EL-9600
SOLUTIONS TO SELECTED ACTIVITIES
2. NUMERICAL DESCRIPTION OF A
ONE-VARIABLE DATA SET
ADDITIONAL PROBLEMS
1. 63.9, 6.1, 5.7, 575, 37033, 9, 55, ...
2. 4.6, 3.7, 3.7, 205, 1545, 45, 1, ...
BLACKLINE MASTERS 2.3-4
ACTIVITY 1
4. 16.3, 2.9, 2.7, 130, 2172, 8, 11, ...
ACTIVITY 2
5. 3.48, 1.7, 100, yes
6. NUMERICAL DESCRIPTION OF A
TWO-VARIABLE DATA SET
ADDITIONAL PROBLEMS
1. 67, 4.8, 4.3, 335, 22539, 5, 62, ...
2. 16.4, 1.2, 1.2, 1018, 16804, 62, 15, ...
BLACKLINE MASTER 6.3
ACTIVITY 1
3. 15.75, 16.75
ACTIVITY 2
2. 3.48, 3.48, yes
7. GRAPHICAL PORTRAYAL OF A
TWO-VARIABLE DATA SET
ADDITIONAL PROBLEMS
1. Possible questions:
a. When does the per capita glass waste
materials begin to decline?
b. What pattern does the per capita glass
waste materials seem to follow?
c. Roughly estimate the per capita glass
waste materials in the year 1990.
2. Possible questions:
a. At which participant’s age does the
largest increase in time to walk the
mile occur?
b. As the participant’s age increases, what
happens to the time it takes the
participant to walk one mile?
c. Roughly estimate the time a 72 year-old
male participant would take to walk the
mile?
BLACKLINE MASTER 7.3
ACTIVITY 1
5. increases
6. a line
7. 136 pounds
8. LINEAR REGRESSIONS
ADDITIONAL PROBLEMS
1. y = -.6x + 103.1
2. y = 1.006x - 1410.4
BLACKLINE MASTER 8.3
ACTIVITY 1
1. y=1.02x + 11.86
2. .992
ACTIVITY 2
1. y=.03x + 41.858
2. .0607
9. OTHER REGRESSIONS AND MODEL OF
BEST FIT
ADDITIONAL PROBLEM
The best fitting regression model (excluding the
cubic and quartic models because the addition
of additional predictors will always increase r
2
)
is the quadratic model of Y =
-
.07x
2
+ 9.26x –
240.52 with a r
2
value of .6254. The remaining
models and corresponding r values were:
exponential .4997
natural exponential. 4997
power .4793
linear .4788
natural log .4601
base ten log .4601
inverse .4411