Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get their messages across. Currently, their best modes of advertisement are commercials on daytime TV, advertisements in select magazines, fliers in convalescent homes, and advertisements on certain Web pages.Marketing managers for Jointsoft are investigating these four modes of advertisement in four small communities (with a different mode of advertisement in each community). The marketing managers have selected 38 days at random and are looking at the daily sales (in dollars) in each of the communities on each of these days. Here is what they have to work with. GroupsSample sizeSample meanSample varianceTV38573.01777.7Magazines38554.32761.0Fliers38584.02445.4Web pages38587.32943.2 Suppose that the marketing managers perform a one-way, independent-samples ANOVA test to decide if there are differences in the mean daily sales arisingfrom the four modes of advertisement. (So, they're assuming that the only difference among the four communities is the mode of advertisement used in it.)Such a test uses the following statistic.Variation between the samplesF =Variation within the samplesFor the information in the chart above, F 3.39.(a) Give the numerator degrees of freedom of this Fstatistic.(b) Give the denominator degrees of freedom of this Fstatistic.(c) Using the 0.05 level of significance, can themarketing managers conclude that the mean dailysales arising from at least one of the modes ofadvertisement differs from the others?) YesO No

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Description: Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get the

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Answered: Suppose that the marketing managers…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get their messages across. Currently, their best modes of advertisement are commercials on daytime TV, advertisements in select magazines, fliers in convalescent homes, and advertisements on certain Web pages.

Marketing managers for Jointsoft are investigating these four modes of advertisement in four small communities (with a different mode of advertisement in each community). The marketing managers have selected 38 days at random and are looking at the daily sales (in dollars) in each of the communities on each of these days. Here is what they have to work with.

Groups	Sample size	Sample mean	Sample variance
TV	38	573.0	1777.7
Magazines	38	554.3	2761.0
Fliers	38	584.0	2445.4
Web pages	38	587.3	2943.2

Suppose that the marketing managers perform a one-way, independent-samples ANOVA test to decide if there are differences in the mean daily sales arising
from the four modes of advertisement. (So, they're assuming that the only difference among the four communities is the mode of advertisement used in it.)
Such a test uses the following statistic.
Variation between the samples
F =
Variation within the samples
For the information in the chart above, F 3.39.
(a) Give the numerator degrees of freedom of this F
statistic.
(b) Give the denominator degrees of freedom of this F
statistic.
(c) Using the 0.05 level of significance, can the
marketing managers conclude that the mean daily
sales arising from at least one of the modes of
advertisement differs from the others?
) Yes
O No

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