For a study conducted by the research department of a pharmaceutical company, 260 randomly selected individuals were asked to report the amount of money they spend annually on prescription allergy relief medication. The sample mean was found to be $17.80 with a standard deviation of $4.30. A random sample of 280 individuals was selected independently of the first sample. These individuals reported their annual spending on non-prescription allergy relief medication. The mean of the second sample was found to be $18.20 with a standard deviation of $3.50. As the sample sizes were quite large, it was assumed that the respective population standard deviations of the spending for prescription and non-prescription allergy relief medication could be estimated as the respective sample standard deviation values given above. Construct a 90% confidence interval for the difference μ₁-₂ between the mean spending on prescription allergy relief medication (₁) and the mean spending on non-prescription allergy relief medication (H₂). Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit: Explanation Check X Ś ©2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility Español M
For a study conducted by the research department of a pharmaceutical company, 260 randomly selected individuals were asked to report the amount of money they spend annually on prescription allergy relief medication. The sample mean was found to be $17.80 with a standard deviation of $4.30. A random sample of 280 individuals was selected independently of the first sample. These individuals reported their annual spending on non-prescription allergy relief medication. The mean of the second sample was found to be $18.20 with a standard deviation of $3.50. As the sample sizes were quite large, it was assumed that the respective population standard deviations of the spending for prescription and non-prescription allergy relief medication could be estimated as the respective sample standard deviation values given above. Construct a 90% confidence interval for the difference μ₁-₂ between the mean spending on prescription allergy relief medication (₁) and the mean spending on non-prescription allergy relief medication (H₂). Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit: Explanation Check X Ś ©2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility Español M
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:For a study conducted by the research department of a pharmaceutical company, 260 randomly selected individuals were asked to report the amount of money
they spend annually on prescription allergy relief medication. The sample mean was found to be $17.80 with a standard deviation of $4.30. A random sample of
280 individuals was selected independently of the first sample. These individuals reported their annual spending on non-prescription allergy relief medication.
The mean of the second sample was found to be $18.20 with a standard deviation of $3.50. As the sample sizes were quite large, it was assumed that the
respective population standard deviations of the spending for prescription and non-prescription allergy relief medication could be estimated as the respective
sample standard deviation values given above. Construct a 90% confidence interval for the difference μ₁-₂ between the mean spending on prescription
allergy relief medication (₁) and the mean spending on non-prescription allergy relief medication (H₂). Then find the lower limit and upper limit of the 90%
confidence interval.
Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult a list of
formulas.)
esc
Lower limit:
Upper limit:
Explanation
@
Check
X
S
%
A
&
©2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility
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M
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