Question
In: Statistics and Probability
A recent study in a marketing journal used a sample gathered by asking individuals to complete...
A recent study in a marketing journal used a sample gathered by asking individuals to complete an online survey about a particular product. This survey was then used to make inference about the characteristics (e.g., income and education levels) of the buyers of the product.
If you were reviewing their results, what statistical issues might you want to focus on? What questions might you want to ask the researchers?
Solutions
orchestra answered 2 years agoRelated Solutions
A recent study in the Journal of the American Medical Association reported the results of an experiment where 40 overweight individuals followed the Zone diet for one year.
A recent study in the Journal of the American Medical Association reported the results of an experiment where 40 overweight individuals followed the Zone diet for one year. Their weight changes at the end of the year had a mean of x¯=3.1x¯=3.1 kg with a standard deviation of s=5.9s=5.9 kg. We want to use this data to test the claim that the diet has an effect, that is, that the weight change is higher than 0.
1. Which set of...
1 point) A recent study in the Journal of the American Medical Association reported the results...
1 point) A recent study in the Journal of the American Medical
Association reported the results of an experiment where 40
overweight individuals followed the Weight Watchers diet for one
year. Their weight changes at the end of the year had a mean of
?¯=3.1x¯=3.1 kg with a standard deviation of ?=4.7s=4.7 kg. We want
to use this data to test the claim that the diet has an effect,
that is, that the weight change is higher than 0.
1....
1 point) A recent study in the Journal of the American Medical Association reported the results...
1 point) A recent study in the Journal of the American Medical
Association reported the results of an experiment where 40
overweight individuals followed the Weight Watchers diet for one
year. Their weight changes at the end of the year had a mean of
x¯=3.1x¯=3.1 kg with a standard deviation of s=5.1s=5.1 kg. We want
to use this data to test the claim that the diet has an effect,
that is, that the weight change is higher than 0.
1....
In a recent sample of 83 used cars sales costs, the sample mean was $6,425 with...
In a recent sample of 83 used cars sales costs, the sample mean
was $6,425 with a standard deviation of $3,156. Assume the
underlying distribution is approximately normal. NOTE: If you are
using a Student's t-distribution, you may assume that the
underlying population is normally distributed. (In general, you
must first prove that assumption, though.) a.) Construct a 95%
confidence interval for the population mean cost of a used car.
b.)(iii) Calculate the error bound. (Round your answer to one...
In a recent sample of 87 used cars sales costs, the sample mean was $6,725 with...
In a recent sample of 87 used cars sales costs, the sample mean
was $6,725 with a standard deviation of $3,153. Assume the
underlying distribution is approximately normal. a) Which
distribution should you use for this problem? (Enter your answer in
the form z or tdf where df is the degrees of freedom.) b) In words,
define the random variable X. c)Construct a 95% confidence interval
for the population mean cost of a used car. (i) State the
confidence interval....
Direct marketing companies are turning to the Internet for new opportunities. A recent study by Gruppo,...
Direct marketing companies are turning to the Internet for new
opportunities. A recent study by Gruppo, Levey, & Co. showed
that 73% of all direct marketers conduct transactions on the
Internet. Suppose a random sample of 310 direct marketing companies
is taken.
a. What is the probability that between 220 and
241 (inclusive) direct marketing companies are turning to the
Internet for new opportunities?
b. What is the probability that 75% or more of
direct marketing companies are turning to...
A market research firm used a sample of individuals to rate the purchase potential of a...
A market research firm used a sample of individuals to rate the
purchase potential of a particular product before
and after
the individuals saw a new television commercial about the product.
The purchase potential ratings were
based on a
0 to 10 scale, with higher values indicating a higher purchase
potential. Test whether the commercial
improved
the mean purchase potential rating. at the .10 level of
significance.
Individual
After
Before
Carl Hall
6
5
Malcom Armstead
6
4
Ron Baker...
A recent study in the Journal of Consumer Research suggests that appetite stimuli can make people...
A recent study in the Journal of Consumer Research suggests that
appetite stimuli can make people more impatient in unrelated areas.
Participants in the study, all college students, were asked to
serve as photo editors for a magazine. Half were randomly selected
to view appetite-stimulating pictures of desserts, and the other
half viewed non-appetite-stimulating nature pictures. Then the
participants were offered a choice between an apartment with a
great view and an apartment close to work. The apartment with a...
A study on highway safety studied the driving habits of individuals. A sample of 78 cars...
A study on highway safety studied the driving habits of
individuals. A sample of 78 cars travelling on the highway revealed
an average speed of 94 kph with a standard deviation of 29.9 kph.
Determine the 95% confidence interval for the mean speed of all
cars (kph), if it is known that speed is normally distributed. Give
the upper limit only (in kph) correct to three decimal places.
The Highway Safety Department wants to study the driving habits of individuals. A sample of 34...
The Highway Safety Department wants to study the driving habits
of individuals. A sample of 34 cars traveling on a particular
stretch of highway revealed an average speed of 68.8 miles per hour
with a standard deviation of 9.8 miles per hour. Round to 4 decimal
places.
1.Calculate a 99% confidence interval for the true mean speed of
all cars on this particular stretch of highway.
( , )
2. What sample size is needed to estimate the true average...
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