Question

2. Perform a hypothesis test, then make a conclusion about the claim:

A consumer research organization states that the mean time a US adult spends on their computer per day is more than 5.2 hrs. You want to test this claim. You find that a random sample of 20 US adults spend a mean of 5.5 hrs on their computers per day. Assume the population standard deviation is 1.1 hrs. At ? = .02, can you support the research organization’s claim?

Answer #1

A consumer research organization states that the mean caffeine
content per 12-ounce bottle of a population of caffeinated soft
drinks is 37.8 milligrams. You find a random sample of 48 12-ounce
bottles of caffeinated soft drinks that has a mean caffeine content
of 41.5 milligrams. Assume the population standard deviation is
12.5 milligrams. At α=0.05, what type of test is this and can you
reject the organization’s claim using the test statistic?

A consumer research organization states that the mean caffeine
content per 12-ounce bottle of a population of caffeinated soft
drinks is 37.8 milligrams. You find a random sample of 48 12-ounce
bottles of caffeinated soft drinks that has a mean caffeine content
of 41.5 milligrams. Assume the population standard deviation is
12.5 milligrams. At α=0.05, what type of test is this and can you
reject the organization’s claim using the test statistic?
Claim is null, fail to reject the null...

Identify the null hypothesis, alternative hypothesis,
test statistic, P-value, conclusion about the null hypothesis, and
final conclusion that addresses the original claim. Use the P-value
method.
A simple random sample of 55 adults is obtained from a normally
distributed population, and each person’s red blood cell count (in
cells per microliter) is measured. The sample mean is 5.26 and the
sample standard deviation is 0.54. Use α = .07 to test the claim
that the sample is from a population...

Test the following claim. Identify the null hypothesis,
alternative hypothesis, test statistic, critical value(s),
conclusion about the null hypothesis, and final conclusion that
addresses the original claim. A manual states that in order to be
a hit, a song must be no longer than three minutes and thirty
seconds (or 210 seconds). A simple random sample of 50 current
hit songs results in a mean length of 250.0 sec. Assume the
population standard deviation of song lengths is 54.5 sec....

You will perform a Chi-Square test and an
ANOVA test. For each hypothesis test make sure to
report the following steps:
Identify the null hypothesis, Ho, and the alternative
hypothesis, Ha.
Determine whether the hypothesis test is left-tailed,
right-tailed, or two-tailed.
Find the critical value(s) and identify the rejection
region(s).
Find the appropriate standardized test statistic. If convenient,
use technology.
Decide whether to reject or fail to reject the null
hypothesis.
Interpret the decision in the context of the original...

State your conclusion to the hypothesis test. A national
organization has been working with utilities throughout the nation
to find sites for large wind machines that generate electricity.
Wind speeds must average more than 22 miles per hour (mph) for a
site to be acceptable. Recently, the organization conducted wind
speed tests at a particular site. Based on a sample of n=33 wind
speed recordings (taken at random intervals), the wind speed at the
site averaged 22.8 mph, with a...

In a market research study, members of a consumer test panel are
asked to rate the visual appeal (on a 1 to 10 scale) of the texture
of dashboard plastic trim in a mockup of a new fuel cell car. The
manufacturer is testing four finish textures. Panelists are
assigned randomly to evaluate each texture. The test results are
shown below. Each cell shows the average rating by panelists who
evaluated each texture. Research question: Is mean rating
affected by...

“About Us” Survey. Test hypothesis to check the claim that
gender doesn’t create any difference in heart rates between young
males and females. Use the significance level = 0.01 .
Use two random samples taken from survey data and computer output
provided.
Don’t need to calculate the standard error by hand, use SEx1 −x2
= 4.51
Fill out the table
Write appropriate null and alternative hypotheses.
Perform the test.
Estimate and interpret the p-value.
Sketch the distribution curve to...

Part 1 Hypothesis Test and Confidence Interval from 1 sample
Test ONE claim about a population parameter by collecting your
own data or using our class survey data. Include your
written claim, hypothesis in both
symbolic and written form, relevant statistics
(such as sample means, proportions etc.), test
statistic, p-value (or critical value),
conclusion, and interpretation of
your conclusion in the context of your claim. Use a 0.05
significance level.
You will also construct a 95% confidence interval
estimate of...

Notation for hypothesis tests about a population
mean
Suppose you are conducting a study about how the average US
worker spends time over the course of a workday. You are interested
in how much time workers spend per day on personal calls, emails,
and social networking websites, as well as how much time they spend
socializing with coworkers versus actually working.
The most recent census provides data for the entire population
of US workers on variables such as travel time...

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