Question

(Hypothesis Testing Questions) You perform the Hypothesis test, and you find the following information. What would be your conclusion and why? A coffee shop relocates to Italy and wants to make sure that all lattes are consistent. They believe that each latte has an average of 4 oz of espresso. If this is not the case, they must increase or decrease the amount. A random sample of 25 lattes shows a mean of 4.6 oz of espresso and a standard deviation of .22 oz. Use alpha = .05 and run a one sample t-test to compare with the known population mean. Are the means significantly different? H0: The average lattes has 4 oz of espresso H1: The average latte has significantly different amount than 4 oz of espresso Df = n-1 = 25-1 = 24 Significance Level = .05 t a, df = t .025, 24 = 2.064 Test Statistic t = .044

Answer #1

1.
For this problem you will need a t-table. What is the t-value
needed for a confidence interval with a sample size = 25 and alpha
=.05?
Group of answer choices
2.064
2.060
1.708
1.706
2.
Small Sample Mean Problem. The maker of potato chips uses an
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To test if students, on average, exercise more than 2 hr/week, a
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mu=2 vs. Ha: mu > 2
Test statistic t=5.0 with df=24. At 5% significance level, the
decision is to reject H0. What statements are FALSE? Choose ALL
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Question: Hypothesis Testing test the following: Hypothesis
Testing test the following: Determine if there is sufficient
evidence to conclude the average amount of births is over 8000 in
the United States and territories at the 0.05 level of
significance.
Sample Size is 52 (states and US territories)
Mean: 6,869 Median: 6,869 Standard Deviation: 8,100 Minimum: 569
Maximum : 45,805
Clearly state a null and alternative hypothesis. Give the value
of the test statistic. Report the P-Value. Clearly state your
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The mean crying time of infants during naptime at a local
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reduced crying time at a .05 level of significance.
A) the new naptime routine significantly reduced crying time,
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B) the new naptime routine did not reduce crying time, t(24)=
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8. Hypothesis testing with ANOVA
Opinions about whether caffeine enhances test performance
differ. You design a study to test the impact of drinks with
different caffeine contents on students’ test-taking abilities. You
choose 21 students at random from your introductory psychology
course to participate in your study. You randomly assign each
student to one of three drinks, each with a different caffeine
concentration, such that there are seven students assigned to each
drink. You then give each of them a...

or the following, indicate what type of analysis (test) you
would perform and what alternative hypothesis you are testing. If
you think a directional test is appropriate, make sure you
incorporate this in the alternative hypothesis. In your answer,
please indicate 2 things: the type of analysis AND the alternative
hypothesis Important: You may not know how to do the correct
analysis. If this is the case, simply write “talk to a
statistician” or “I wasn't taught this” as the...

For the following,
indicate what type of analysis (test) you would perform and what
alternative hypothesis you are testing. If you think a directional
test is appropriate, make sure you incorporate this in the
alternative hypothesis. In your answer, please indicate 2 things:
the type of analysis AND the alternative hypothesis
You measure both
length and width of three species of barnacle. You are trying to
figure out if there is a difference between these three species.
You measure 22...

Below are some examples of hypothesis testing questions. Match
the correct test to the question.
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life insurance. Suppose that for a random sample of 50 adults from
a given U.S. city, a research finds that only 56% of them have
purchased life insurance. At a 0.05 level of significance test, is
this sample finding significantly lower than the 66% reported by
Heritage Union?
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The manager at the Dixon’s seafood restaurant is interested in
finding out if her servers earn similar tips during the lunch hour
compared to the national average. Nationally, servers at diners
earn $25 in the lunch hour with a standard deviation of $3.25. A
random sample of size 4 servers were taken from the wait staff at
the Dobbs Diner. The tips earned during the lunch hour were $18,
$13, $27, and $23. Is the sample mean tips for wait...

Perform a two-sample hypothesis test to consider if the yields
for product A and product B are different.
significance level of α=0.05.
You may assume that the population variances for product A and B
are equal.
You should take the mean of Yield A first in the calculation of
your test statistic.
(a) State the null hypothesis and the alternate hypothesis.
(b) Calculate the test statistic, taking note of the order of
calculation as indicated in the question t= ______...

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