Residential Energy Consumption (East) Data on residential energy consumption per capita (measured in million BTU) had a mean of 70.8 and a standard deviation of 7.3 for the states east of the Mississippi River. Assume that the distribution of residential energy use if approximately unimodal and symmetric. a. Between which two values would you expect to find about 68% of the per capita energy consumption rates? b. Between which two values would you expect to find about 95% of the per capita energy consumption rates? c. If an eastern state had a per capita residential energy consumption rate of 54 million BTU, would you consider this unusual? Explain. d. Indiana had a per capita residential energy consumption rate of 80.5 million BTU. Would you consider this unusually high? Explain.
Residential Energy Consumption (East) Data on residential energy consumption per capita (measured in million BTU) had a mean of 70.8 and a standard deviation of 7.3 for the states east of the Mississippi River. Assume that the distribution of residential energy use if approximately unimodal and symmetric. a. Between which two values would you expect to find about 68% of the per capita energy consumption rates? b. Between which two values would you expect to find about 95% of the per capita energy consumption rates? c. If an eastern state had a per capita residential energy consumption rate of 54 million BTU, would you consider this unusual? Explain. d. Indiana had a per capita residential energy consumption rate of 80.5 million BTU. Would you consider this unusually high? Explain.
Solution Summary: The author states the range of values within which 68% of the data for per capita energy consumption lies.
Residential Energy Consumption (East) Data on residential energy consumption per capita (measured in million BTU) had a mean of 70.8 and a standard deviation of 7.3 for the states east of the Mississippi River. Assume that the distribution of residential energy use if approximately unimodal and symmetric.
a. Between which two values would you expect to find about 68% of the per capita energy consumption rates?
b. Between which two values would you expect to find about 95% of the per capita energy consumption rates?
c. If an eastern state had a per capita residential energy consumption rate of 54 million BTU, would you consider this unusual? Explain.
d. Indiana had a per capita residential energy consumption rate of 80.5 million BTU. Would you consider this unusually high? Explain.
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Part (b)
Draw a scatter plot of the ordered pairs.
N
Life
Expectancy
Life
Expectancy
80
70
600
50
40
30
20
10
Year of
1950
1970 1990
2010 Birth
O
Life
Expectancy
Part (c)
800
70
60
50
40
30
20
10
1950
1970 1990
W
ALT
林
$
#
4
R
J7
Year of
2010 Birth
F6
4+
80
70
60
50
40
30
20
10
Year of
1950 1970 1990
2010 Birth
Life
Expectancy
Ox
800
70
60
50
40
30
20
10
Year of
1950 1970 1990 2010 Birth
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P.B.
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&
7
80
% 5
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B
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N
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744
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ALT
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Chapter 3 Solutions
Pearson eText Introductory Statistics: Exploring the World Through Data -- Instant Access (Pearson+)
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