Question
A trucking fleet-owner owns two semi-trucks and wishes to compare the amount of fuel used per...
A trucking fleet-owner owns two semi-trucks and wishes to compare the amount of fuel used per week by the two vehicles. In a random sample of 100 weeks, truck #1 used a mean volume of 330 gallons with a standard deviation of 12 gallons. In a second, independent random sample of 100 weeks, truck #2 used a mean volume of 316 gallons with standard deviation 10 gallons. It is of interest to construct a confidence interval for the difference in population means using a confidence level of 80 percent. ?1−?2, where ?1 is the mean fuel volume used by truck #1 and ?2 is the mean volume of fuel used by truck #2. Enter values below rounded to three decimal places.
(a) The estimate is: _____ gallons.
(b) The standard error is: _______gallons.
(b) The multiplier is: _______
Homework Answers
Answer #1
a) The estimate is 
b) The standard error is = 1.562 gallons
c) The multiplier is = 1.286
Not the answer you're looking for?
Similar Questions
Answer number 2 please. 1. Records of 40 used passenger cars and 40 used pickup trucks were...
Answer number 2 please.
1. Records
of 40 used passenger cars and 40 used pickup trucks were randomly
selected to investigate the
difference in
how long the owners kept their vehicles. For cars, the mean was 5.3
years with standard deviation 2.2
years. For
pickup trucks, the mean was 7.1 years with standard deviation 3.0
years. Find a 95% confidence interval
for the
true difference in means. Add a sentence. (Note that these are all
sample results.) (5)
2. Using
the information in Problem One,...
The burning rates of two different solid-fuel propellants used in aircrew escape systems are being studied....
The burning rates of two different solid-fuel propellants used
in aircrew escape systems are being studied. It is known that both
propellants have approximately the same standard deviation of
burning rate; that is, σ1=σ2=3 cm/s. From a random sample of size
n1=20 and n2=20, we obtain x¯1=18.02 cm/s and x¯2=24.35 cm/s.
(a) Test the hypothesis that both propellants have the same mean
burning rate. Use a fixed-level test with α=0.05 and choose the
appropriate conclusion from below:
Since Choose your...
An entrepreneur owns some land that he wishes to develop. He identifies two development options: build...
An entrepreneur owns some land that he wishes to develop. He
identifies two development options: build condominiums or build
apartment buildings. Accordingly, he reviews public records and
derives the following summary measures concerning annual
profitability based on a random sample of 34 for each such local
business venture. For the analysis, he uses a historical
(population) standard deviation of $21,500 for condominiums and
$19,500 for apartment buildings. Use Table 1.
Sample 1 represents condominiums and Sample 2 represents
apartment buildings....
An entrepreneur owns some land that he wishes to develop. He identifies two development options: build...
An entrepreneur owns some land that he wishes to develop. He
identifies two development options: build condominiums or build
apartment buildings. Accordingly, he reviews public records and
derives the following summary measures concerning annual
profitability based on a random sample of 30 for each such local
business venture. For the analysis, he uses a historical
(population) standard deviation of $23,300 for condominiums and
$19,600 for apartment buildings. Use Table 1.
Sample 1 represents condominiums and Sample 2 represents
apartment buildings....
An entrepreneur owns some land that he wishes to develop. He identifies two development options: build...
An entrepreneur owns some land that he wishes to develop. He
identifies two development options: build condominiums or build
apartment buildings. Accordingly, he reviews public records and
derives the following summary measures concerning annual
profitability based on a random sample of 31 for
each such local business venture. For the analysis, he uses
a historical (population) standard deviation of $22,300 for
condominiums and $20,000 for apartment buildings. Use
Table 1.
Sample 1 represents condominiums and Sample 2 represents
apartment buildings....1 of 2 Geoff is the proud owner of a restaurant. He is interested in determining...
1 of 2
Geoff is the proud owner of a restaurant. He is interested in
determining whether his Wagyu beef or Hiramasa kingfish sashimi
should be marketed as the Geoff Special. Geoff has selected a
random sample of 20 people to taste his Wagyu beef and give it a
score out of 100. He also selected a different random sample of 20
people to taste his Hiramasa kingfish sashimi and give it a score
out of 100.
The sample mean...
4. Two machines are used for filling glass bottles with a soft-drink beverage. The filling processes...
4. Two machines are used for filling glass bottles
with a soft-drink beverage. The filling
processes have known standard deviations s1 = 0.010 L, and s2 =
0.015 L, respectively. A
random sample of n1 = 25 bottles from machine 1 and n2 = 20 bottles
from machine 2,
results in average net contents of ?̅
# = 2.04 L, and ?̅
$ = 2.07 L.
a. Test the hypothesis that both machines fill to the same net
contents, using...
To compare prices of two local stores, a random sample of items that are sold in...
To compare prices of two local stores, a random sample of items
that are sold in both stores were selected and their price noted in
the first weekend of the year:
(12 marks)
Item
Store A
Store B
Difference (Store A - Store B)
1
1.65
1.99
-0.34
2
8.70
8.49
0.21
3
0.75
0.90
-0.15
4
1.05
0.99
0.06
5
11.30
11.99
-0.69
6
7.70
7.99
-0.29
What are the null and alternative hypothesis if we want to
confirm...
To compare prices of two grocery stores in Toronto, a random sample of items that are...
To compare prices of two grocery stores in Toronto, a random
sample of items that are sold in both stores were selected and
their price noted in the first weekend of July 2018: (12
Points)
Item
Store A
Store B
Difference (Store A - Store B)
1
1.65
1.98
-0.33
2
8.70
8.49
0.21
3
0.75
0.89
-0.14
4
1.05
0.99
0.06
5
11.30
11.99
-0.69
6
7.70
7.99
-0.29
7
6.55
6.99
-0.44
8
3.70
3.59
0.11
9
8.60...
1. A friend who works in a big city owns two cars, one small and one...
1. A friend who works in a big city owns two cars, one small and
one large. One-quarter of the time he drives the small car to work,
and three-quarters of the time he takes the large car. If he takes
the small car, he usually has little trouble parking and so is at
work on time with probability 0.8. If he takes the large car, he is
on time to work with probability 0.6. Given that he was at...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 4 minutes ago
asked 14 minutes ago
asked 47 minutes ago
asked 47 minutes ago
asked 48 minutes ago
asked 51 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 2 hours ago
asked 2 hours ago
asked 2 hours ago