Question

The table below contains the overall miles per gallon (MPG) of a type of vehicle. Complete parts a and b below.

33 |
24 |
31 |
34 |
28 |
29 |
20 |
33 |
33 |
29 |
43 |
32 |
33 |
22 |

a. Construct a

99% confidence interval estimate for the population mean MPG for this type of vehicle, assuming a normal distribution.The 99%

confidence interval estimate is from____MPG to ____MPG.

(Round to one decimal place as needed.)

Answer #1

Sample size = n = 14

Sample mean = = 30.2857

Standard deviation = s = 5.7570

We have to construct 99% confidence interval.

Formula is

Here E is a margin of error.

Degrees of freedom = n - 1 = 14 - 1 = 13

Level of significance = 0.01

tc = 3.012 ( Using t table)

So confidence interval is ( 30.2857 - 4.6347 , 30.2857 + 4.6347)
= > **( 25.7 , 34.9)**

A. 19A telecommunications company wants to estimate the
proportion of households that would purchase an additional
telephone line if it were made available at a substantially reduced
installation cost. Data are collected from a random sample of
500
households. The results indicate that
110
of the households would purchase the additional telephone line
at a reduced installation cost.
Construct a
99%
confidence interval estimate for the population proportion of
households that would purchase the additional telephone line.
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Overall, the Miles Per Gallon for customers of MallState is
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Compute the standard deviation.
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Compute the coefficient of variation.
a. 10.8758 b. 28.97959 c. 24.14967 d.9.92824

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recorded by consumers, the following data are collected:
Automakers: 29 28 28 24 27 27 24 38
Consumers: 27 27 25 20 22 25 23 36
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c. Determine the line of best fit.
d. If the manufacturer claims 25 MPG, what should the consumer
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a. (28.9642, 39.0358)
b. (29.2226, 38.7774)
c. (28.9642, 38.7774)
d. (29.2226, 39.0358)
e. (29.9193, 38.0807)

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A sample of 20 cars was taken, and the miles per gallon (MPG),
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Develop a simple regression model to predict the dependent
variable, MPG, using horsepower
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Using R², which of the 2 causal forecasting models, A or B, is
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Develop a multiple regression model to predict the dependent
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Miles Per Gallon (MPG) figures for 30 automobile/small truck
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statistics for the 30 MPG numbers are reported in the table
below:
Min
22
Max
44
Mean
31.6
Median
32
Mode
38
Standard Deviation
5.25
If all 30 models start with 10 gallons of gasoline and drove
until they ran out of gas, how many miles would the farthest
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If all 30 models start with 10 gallons...

1. It is necessary for an automobile producer to estimate the
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car producer wants to test the hypothesis that ? μ , the mean
number of miles per gallon, is 28.7 28.7 against the alternative
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