Question

Please show all work:

Assignment: You will be answering problems #1 - #4. For each problem, you will need to complete parts A through F. Please make sure you answer each part completely and you offer justification where necessary. Do all work "by hand" (not using StatCrunch) as good practice for your next exam!

A) Write the claim mathematically and state the null and alternative hypotheses.

B) Determine whether the hypothesis test is left-tailed, right-tailed, or two tailed and whether to use a z-test, a t-test, or a chi-square test. Explain your reasoning.

C) Find the critical value(s), draw a sketch identifying the rejection region(s).

D) Find the appropriate standardized test statistic.

E) Decide whether to reject or fail to reject the null hypothesis.

F) Interpret the decision in the context of the original claim.

**#2) A consumer group claims that the mean annual
consumption of coffee by a person in the U.S. is 23.2 gallons. A
random sample of 90 people in the U.S. has a mean annual coffee
consumption of 21.6 gallons. Assume the population standard
deviation is 4.8 gallons. At alpha equals 0.05, can you reject the
claim?**

Answer #1

Please show all
work:
Assignment:
You will be answering problems #1 - #4. For each problem, you will
need to complete parts A through F. Please make sure you answer
each part completely and you offer justification where
necessary. Do all work "by hand" (not using StatCrunch)
as good practice for your next exam!
A) Write the claim
mathematically and state the null and alternative hypotheses.
B) Determine whether
the hypothesis test is left-tailed, right-tailed, or two tailed and
whether...

4. A consumer group claims that the mean annual consumption of
coffee by a person in the United States is 25 gallons. A random
sample of 100 people in the United States has a mean annual coffee
consumption of 22.5 gallons. Assume the population standard
deviation is 4.8 gallons. At ? = 0.05, can you reject the claim? Be
sure to set up your hypothesis test, solve using the p-value, and
interpret your results

Hypothesis Test Steps:
H_0 and H_1 and alpha
What test did you choose (Z or T) and check any assumptions
that you need to
Find the critical region and critical value(s)
Find the proper test statistic
Find the p-value
State your decision based on both d) and e)
If you reject build the 95% confidence interval
Question 2: Annual per capita consumption of
milk is 21.6 gallons in 2006. Being from the Midwest, you would
think the milk consumption would...

A used car dealer says that the mean price of a three-year-old
sport utility vehicles (in good condition) is $20,000. You suspect
that the claim is incorrect and find that a random sample of 22
similar vehicles has a mean price of $20,640 and a standard
deviation of $1990. Is there enough evidence to reject the claim at
α=0.05? (a) Write the claim mathematically. Identify H and H . (b)
Determine whether the hypothesis test is one-tailed or two-tailed
and...

*Please show your work
*Be sure to round z-values to 2 decimal places and round
any probabilities to 4 decimal places
*If doing a hypothesis test, be sure to sure state the
Ho and Ha, you may choose the p-value or rejection region approach
to hypothesis testing, unless otherwise noted in the
question.
*If you need to use the normal approximation, be sure to
show the appropriate steps.
1. A survey of U.S. adults found that 8% say
their favorite...

This requires you to show ALL work needed to conduct the two tests
of hypotheses below. Determine if your tests are one tailed or
two-tailed according to your alternative hypothesis. You will have
to use a z table as well.
1) A random sample of 20 observations selected from a normal
population produced x bar = 72.6 and s^2 (variance) = 19.4
a) Test the null hypothesis: mean = 80 against the alternative
hypothesis: mean < 80. Use alpha =...

Make sure to show all steps to receive full credit, that is: a)
Identify the claim: state the null and alternative hypotheses. b)
Determine the test: left-tailed, right-tailed, or two-tailed. c)
Graph your bell-shaped curve and label your levels of significance
or critical value. d) Find your standardized test statistic ? and
label it on your graph. e) Decide whether to reject or fail to
reject the null hypothesis. f) Interpret your result.
1) A dealership projected that the mean...

This case study is about a study on coffee consumption of people
that live in the United States. In total, 92 people were randomly
selected and data was gathered regarding the annual consumption of
coffee in gallons. Of these 92, 51 were females and 41 were males.
You must show all work and formulas used in order to receive full
credit. This includes showing all steps of the appropriate
hypothesis test from the chapter notes. Round decimals in
calculations to...

Please show all work and place your final answers on the lines.
No work means no credit.(please show
work)
3. A trainer claims that he will increase your bench press
strength by 25 pounds. A random sample of 51 people that
have worked with the trainer showed a mean bench press strength
increase of 23 pounds with a standard deviation of 5
pounds. Using a significance level of 5%, can you
conclude that the trainer’s claim is valid?
Null Hypothesis:
____________________ Your
Work:...

You will perform a Two Sample Hypothesis Test for Proportions.
For the 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...

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