Question

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally
distributed random variable with a mean of *μ = 24.50* mpg
and a standard deviation of *σ = 3.50* mpg.

**(a)** What is the standard error of *X*¯¯¯
, the mean from a random sample of 9 fill-ups by one driver?
**(Round your answer to 4 decimal places.)**

**(b)** Within what interval would you expect the
sample mean to fall, with 95 percent probability? **(Round
your answers to 4 decimal places.)**

Answer #1

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally
distributed random variable with a mean of μ = 21.50 mpg and a
standard deviation of σ = 2.75 mpg.
(a) What is the standard error of X⎯⎯⎯ , the mean from a random
sample of 9 fill-ups by one driver? (Round your answer to 4 decimal
places.)
(b) Within what interval would you expect the sample mean to...

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally
distributed random variable with a mean of μ = 25.75 mpg
and a standard deviation of σ = 2.75 mpg.
(a) What is the standard error of X bar , the mean
from a random sample of 36 fill-ups by one driver? (Round
your answer to 4 decimal places.)
Standard error of X bar
(b) Within what...

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally
distributed random variable with a mean of μ = 26.50 mpg
and a standard deviation of σ = 3.25 mpg.
(a) What is the standard error of X¯¯¯X¯ , the
mean from a random sample of 25 fill-ups by one driver?
(Round your answer to 4 decimal places.)
Standard error of X¯¯¯X¯
(b) Within what interval...

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally
distributed random variable with a mean of μ = 26.50 mpg and a
standard deviation of σ = 3.25 mpg.
(a) What is the standard error of X¯¯¯
, the mean from a random sample of 25 fill-ups by one driver?
(Round your answer to 4 decimal places.)
(B) Within what interval would you expect the sample mean...

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally
distributed random variable with a mean of u=22.00 MPG and a
standard deviation of a=1.25 MPG (a) What is the standard error of
X, the mean from a random sample of 25 fill-ups by one driver? (b)
Within what interval would you expect the sample mean to fall, with
98 percent probability? The interval is from ? to ?

8.8 The Highway fuel economy of a 2016 Lexus RX 350 FWD
6-cylinder 3.5-L automatic 5-speed using premium fuel is normally
distributed random variable with mean of µ = 27.0 mpg and a
standard deviation of ? = 1.25 mpg: (a) What is the standard area
of X ?, the mean from a random sample 16 fill-ups by one driver?
(b) Within what interval would you expect the sample mean to fall
with 90 percent probability?

The fuel economy of a 2011 Lexus RX 350 2WD 6 cylinder 3.5 L
automatic 5-speed using premium fuel is a normally distributed
random variable with a mean of μ = 26.75 MPG and a standard
deviation of σ = 3.5 MPG. () What is the standard error of X¯¯¯ ,
the mean from a random sample of 36 fill-ups by one driver? (Round
your answer to 4 decimal places.) Standard error of X¯¯¯ (b) Within
what interval would you...

The combined city/highway fuel economy of a 2016 Toyota 4Runner
2WD 6-cylinder 4-L automatic 5-speed using regular gas is a
normally distributed random variable with a range 19 mpg to 22
mpg.
(a) Estimate the standard deviation using Method 3
(the Empirical Rule for a normal distribution) from Table 8.11.
(Round your answer to 4 decimal places.)
Standard deviation =
(b) What sample size is needed to estimate the
mean with 95 percent confidence and an error of ±...

The table provides summary statistics on highway fuel economy of
cars manufactured in 2012 (from Exercise 5.32). Use these
statistics to calculate a 98% confidence interval for the
difference between average highway mileage of manual and automatic
cars, and interpret this interval in the context of the data.
Hwy MPG, Automatic
Hwy MPG, Manual
Mean
22.92
27.88
SD
5.29
5.01
n
26
26
lower bound: mpg (please round to two decimal
places)
upper bound: mpg (please round to two decimal...

The table provides summary statistics on highway fuel economy of
cars manufactured in 2012 (from Exercise 5.32). Use these
statistics to calculate a 98% confidence interval for the
difference between average highway mileage of manual and automatic
cars, and interpret this interval in the context of the data.
Hwy
MPG, Automatic
Hwy
MPG, Manual
Mean
22.92
27.88
SD
5.29
5.01
n
26
26
lower bound: mpg (please round to two decimal
places)
upper bound: mpg (please round to two decimal
places)
Interpret...

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