Question
In: Statistics and Probability
The table gives the gas mileages (mpg) of 7 cars with and without using a fuel...
The table gives the gas mileages (mpg) of 7 cars with and without using a fuel additive. At the α =0.10, is there enough evidence to conclude that the additive improved gas mileage? Assume the populations are normally distributed.
Car - 1 2 3 4 5 6 7
w/ additive - 23.1 25.4 21.9 24.3 19.9 21.2 25.9
w/out additive - 23.6 27.7 23.6 26.8 22.1 22.4 26.3
Solutions
Expert Solution
## It is paired t test :
To test : Ho : μD = 0 VS H1 : μD > 0
Test statistics : t = -4.7361
degree of freedom = n - 1 = 6
α = level of significance = 0.10
t critical value = 1.4397
decision : we reject Ho if |t | > t critical value here |t| > t critical value we reject Ho
Conclusion : There is sufficient evidence to conclude that the additive improved gas mileage .
orchestra answered 1 year agoRelated Solutions
2. The highway fuel economy of cars is normally distributed with a mean of 35 mpg...
2. The highway fuel economy of cars is normally distributed with
a mean of 35 mpg and a standard deviation of 3 mpg.
(A) Ten cars are sampled. How many do you expect to get at most 33
mpg? (9 points)
(B) Ten cars are sampled. What is the probability the mean is at
most 33 mpg? (9 points)
(C) A Ford Explorer gets 30 mpg. Is this unusual? Solve with two
different (VALID) methods. (18 points)
Show work and...
without using the table of Tolerance factors for normal distributions, find a tolerance interval that gives...
without using the table of Tolerance factors for normal
distributions, find a tolerance interval that gives two
sided 95% bounds on 90% of the distribution of packages of 95% lean
beef. Assume the data came from an approximately normal
distribution. where n=30, sample mean=96.2%, and standard
deviation= 0.8%.
We are interested in predicting the fuel efficiency (gasoline mileage in mpg) using the weight of...
We are interested in predicting the fuel efficiency (gasoline
mileage in mpg) using the weight of a vehicle in pounds. A random
sample of 12 vehicles is taken. The Excel output is given below.
Use the output and the fact that R2 = 0.640 to answer the following
questions. Coefficients Standard Error t Stat P-value Lower 95%
Upper 95% Intercept 48.409 5.978 8.098 0.000 35.089 61.728 Weight
-0.006 0.002 -4.214 0.002 -0.010 -0.002 Interpret the slope in
context. Find and...
A fuel gas containing 77% methane, 7% ethane and rest propane by volume. The fuel flows...
A fuel gas containing 77% methane, 7% ethane and rest propane by
volume. The fuel flows to a combustion chamber at the rate of 1321
m^3/h at 15C and 150 kPA (gauge) where it is burned with 8% excess
air entering at 20C. ROund your answer to the nearest whole
number.
a) WHat is the propane percent in the fuel gas?
b) What is the actual number of moles of fuel flowing into the
combustion chamber?
c) What is the...
Congress regulates corporate fuel economy and sets an annual gas mileage for cars. A company with...
Congress regulates corporate fuel economy and sets an annual gas
mileage for cars. A company with a large fleet of cars hopes to
meet the goal of 30.4 mpg or better for their fleet of cars. To see
if the goal is beingmet, they check the gasoline usage for 46
company trips chosen at random, finding a mean of 31.4 mpg and a
standard deviation of 2.57 mpg. Is this strong evidence that they
have attained their fuel economy goal?...
The excel file gives the city and highway gas mileage for 21 two-seater cars, including the...
The excel file gives the city and highway gas mileage for 21
two-seater cars, including the Leaf hybrid car:
Type
City
Hwy
T
17
24
T
20
28
T
20
28
T
17
25
T
18
25
T
12
20
T
11
16
T
10
16
T
17
23
T
60
66
T
9
15
T
9
13
T
15
22
T
12
17
T
22
28
T
16
23
T
13
19
T
20
26
T
20
29
T...
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise...
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)
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise...
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...
1. In the table below are highway fuel consumption amounts (mi/gal) for cars categorized by size...
1. In the table below are highway fuel consumption amounts
(mi/gal) for cars categorized by size (small, midsize, large).
Using a 0.05 significance level, test the claim that the three size
categories have the same mean highway fuel consumption. From the
sample data, does the size of a car appear to affect highway fuel
consumption?
Small (mi/gal): 34 36 28 40
Midsize (mi/gal): 28 31 26 30
Large (mi/gal): 28 26 23 24
The equilibrium water vapor pressure table gives the partial pressure of water when the gas is...
The equilibrium water vapor pressure table gives the partial
pressure of water when the gas is 100.% saturated with water vapor.
If the gas you collected was actually only 85% saturated with water
vapor, calculate the percent error in the number of moles of N2
collected in Part I.
mass nano2 = .111g
v of wet n2 gas = 37.9 ml
partial pressure n2 = .966 atm
moles n2 collected = 1.53*10^-3
moles n2 expected = 1.61*10^-3
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- C++ C++ Write a definition for a structure type for records for CDs. The record contains...
- Research Question: Does the spatial ability differ by biological sex? (Use Data A) Null Hypothesis: Spatial...
- Write a method speedingTicket() that decides whether a driver should be given a ticket from a...
- Beasley Ball Bearings paid a $4 dividend last year. The dividend is expected to grow at...
- 7. In order to improve the network performance and security, ACLs is recommended. Please explain what...
- Noting that there has been an increasing interest in organic foodstuffs with increasing affluence, Mr Tommy...
- 1. the physical sites at which crossing over occurs are the.... A. chiasmata B. Centrioles C....
ADVERTISEMENT