Question
In: Statistics and Probability
From a random sample of 48 days in a recent year, US Gasoline prices had a...
From a random sample of 48 days in a recent year, US Gasoline prices had a mean of $2.34 and a standard deviation of $0.30. Use this information to construct the following confidence intervals and determine the margin of error for each:
a. 90%
b. 95%
c. 99%
Solutions
orchestra answered 2 years agoRelated Solutions
A random sample of the closing stock prices in dollars for a company in a recent...
A random sample of the closing stock prices in dollars for a
company in a recent year is listed below. Assume that
σ is $2.36.
Construct the 90% and 99% confidence intervals for the
population mean. Interpret the results and compare the widths of
the confidence intervals.
22.34
17.02
21.44
16.52
22.13
20.58
19.08
16.08
16.09
19.24
19.58
22.67
17.62
19.96
15.18
21.32
The 90% confidence interval is ($ ? , $ ?)
(Round to two decimal places as needed.)...
A random sample of the price of gasoline from 30 gas stations in a region gives...
A random sample of the price of gasoline from 30 gas stations in
a region gives the statistics below.
y overbary =$3.293.29,
s =$0.24
a) Find a 95% confidence interval for the mean price of regular
gasoline in that region.
b) Find the 90% confidence interval for the mean
c) If we had the same statistics from the sample of 80 stations,
what would the 95% confidence interval be now?
A random sample of the price of gasoline from 30 gas stations in a region gives...
A random sample of the price of gasoline from 30 gas stations in
a region gives the statistics below. Complete parts a) through
c). y overbarequals$4.19, sequals$0.25 a) Find a 95%
confidence interval for the mean price of regular gasoline in that
region. left parenthesis nothing comma nothing right parenthesis
(Round to three decimal places as needed.) b) Find the 90%
confidence interval for the mean. left parenthesis nothing comma
nothing right parenthesis (Round to three decimal places as
needed.)...
A random sample of the price of gasoline from 30 gas stations in a region gives...
A random sample of the price of gasoline from 30 gas stations in
a region gives the statistics below. Complete parts a) through
c).
y=$3.29 s=$0.27
A. Find a 95% confidence interval for the mean price of regular
gasoline in that region. ($__,$__)
B. Find a 90% confidence interval for the mean price of regular
gasoline in that region. ($__,$__)
C. If we had the same statistics from a sample of 80 stations,
what would the 95% confidence interval be...
A random sample of the price of gasoline from 30 gas stations in a region gives...
A random sample of the price of gasoline from 30 gas stations in
a region gives the statistics below. Complete parts a through c
below.
y= $3.89, SE (y) =$0.06
a) Find a 95% confidence interval for the mean price of
regular gasoline in that region.
(Round to three decimal places as needed.)
b) Find the 90% confidence interval for the mean.
(Round to three decimal places as needed.)
c) If we had the same statistics from a sample of...
A random sample of 18 summer days in Boise, ID, had an average high temperature of...
A random sample of 18 summer days in Boise, ID, had an
average high temperature of 87.76o F, with a standard
deviation of 10.81o F, while a random sample of 15
summer days in Duluth, MN, had an average high temperature of
70.73o F, with a standard deviation of 6.71o
F. Find a 99% confidence interval for the difference in the average
summer high temperatures between the two cities and explain what
the interval means.
Provide the difference between the...
Compute in excel A random sample of six cars from a particular model year had the...
Compute in excel
A random sample of six cars from a particular model year had the
fuel consumption figures, measure in miles per gallon, shown below.
(i) Using T.INV, find a 90% confidence interval for the population
mean of fuel consumption for cars of this model year. Assume the
distribution is normal. (Round to 2 digits, since our raw data
below are expressed with one digit.) (Show work in space provided.)
(ii) Calculate the same interval using CONFIDENCE.T. (Show work...
A random sample of 64 drivers used on average 747 gallons of gasoline per year. The...
A random sample of 64 drivers used on average 747 gallons of
gasoline per year. The standard deviation of the population is 34
gallons.
Find the 99% confidence interval of the mean for all drivers.
Round intermediate answers to at least three decimal places. Round
your final answers to the nearest whole number.
A random sample of 6 cars from a particular model year had the following fuel consumption...
A random sample of 6 cars from a particular model year had the
following fuel consumption figures (in miles per gallon). Find the
99% confidence interval for the true mean fuel consumption for cars
of this model year.
Sample data:
20.9, 18.1, 18.5, 21, 20.3, 20.2
find left endpoint & right endpoint.
A random sample of six cars from a particular model year had the following fuel consumption...
A random sample of six cars from a particular model year had the
following fuel consumption figures (in miles per gallon). Find the
98% confidence interval for the true mean fuel consumption for cars
of this model year.
Sample Data
18.6
19.3
19.4
19.8
19.6
19.7
What is the left and right endpoint? Please help
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