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Mpg Distribution
a)
The graph of MPG distribution is
show to the left. The distribution is
skewed to the right.
b)
It is appropriate to use methods
based on normal distributions to
analyze this data. We will use T
distributions because the
population standard deviation is
not known.
Mean test for MPG data
Hypothesized Value
19
Actual Estimate
17.69
DF
19
Std Dev
2.76784
t Test
Test Statistic
2.1166
Prob > t
0.0477*
Prob > t
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Unformatted text preview: 0.9761 Prob < t 0.0239* c) From this JMP output we can conclude that with an alpha value of five percent we can reject the null hypothesis because there is enough evidence that the true MPG of this car is less then 19. d) The Pvalue used in this test is 0.0239, which means that there is a 2.39 percent chance of the average value for this data to be as low as it was if the true average MPG of the car was 19....
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This note was uploaded on 02/16/2012 for the course STATS 1000 taught by Professor Morris during the Spring '11 term at Manitoba.
 Spring '11
 Morris
 Normal Distribution

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