Question

Question Set 2: Mean Test Score A course coordinator is examining scores on an exam. In a representative sample of 35 students, the mean Test score was 87.9 points with a standard deviation of 6.8 points. A. Use Minitab Express to determine if there is evidence that the mean Test score is different from 90 points in the population of all test takers. Use the five-step hypothesis testing procedure outlined below. Remember to include all relevant Minitab Express output and to clearly identify your test statistic and p value. Do not do any hand calculations. [25 points] Step 1: Check assumptions and write hypotheses Step 2: Calculate the test statistic Step 3: Determine the p value Step 4: Decide to reject or fail to reject the null Step 5: State a “real world” conclusion B. Use Minitab Express to construct a 95% confidence interval for the mean Test score in the population. Remember to include your relevant Minitab Express output and to clearly identify your final answer. Do not do any hand calculations. [15 points] C. What minimum sample size would be necessary to construct a 95% confidence interval for the mean score with a margin of error of 1 point? You will need to do hand calculations. Show all of your work. [10 points]

Answer #1

Question Set 2: Mean Exxam Score
A course coordinator is examining scores on an exam. In
a representative sample of 35 students, the mean exxam score was
87.9 points with a standard deviation of 6.8 points.
A. Use Minitab Express to determine if there is evidence
that the mean exxam score is different from 90 points in the
population of all test takers. Use the five-step hypothesis testing
procedure outlined below. Remember to include all relevant Minitab
Express output and...

Reminder: The standard error is computed differently for
a two sample proportion confidence interval and a two sample
proportion hypothesis test.
At the beginning of the Summer 2018 semester, students
enrolled in World Campus and University Park WEB sections of STAT
200 completed a survey. Data concerning their primary campus and
their employment status are presented in the table
below.
Primary Campus
Total
World Campus
University Park
Employed Full-Time
Yes
185
70
255
No
81
341
422
Total
266
411...

In a random sample of 35 Penn State Shenango students, 17 were
attending full-time. In a random sample of 40 World Campus
students, 13 were attending full-time.
Use Minitab Express to construct a 95% confidence interval to
estimate the difference between the proportions of all Penn State
Shenango and all Penn State World Campus students who are attending
full-time. If assumptions are met, use the normal approximation
method. Remember to copy + paste all relevant Minitab Express
output. Clearly identify...

Question Set 1: Finding Probabilities on a Normal
Distribution
A. Use Minitab Express to construct a standard normal
distribution to find the proportion of the curve above z = 2.
Copy+paste your distribution here and clearly identify your final
answer. [8 points]
B. Use Minitab Express to construct a normal
distribution with a mean of 500 and standard deviation of 100 and
find the area above x = 700. Copy+paste your distribution here and
clearly identify your final answer. [8...

1. Chi-Square Goodness-of-Fit Test A representative sample of 37
customers at bagel shop were surveyed and ask if they prefer
sandwiches made on plain, everything, or sesame bagels. Each
participant could only select their one most favorite bagel type.
In that sample, 17 selected plain, 13 selected everything, and 7
selected sesame. Conduct a chi-square goodness-of-fit test to
determine if there is evidence that the proportions of people in
the population who would choose plain, everything, and sesame
bagels are...

1. Use StatKey or Minitab Express to construct the following
distributions. Remember to include all relevant output (i.e., a
screenshot of your distribution in StatKey or Minitab Express) AND
a clear statement of your final answer for each question. [20
points] A. Construct a z distribution to find the area above z =
0.5 B. Construct a z distribution to find the area below z = - 0.5
C. Construct a normal distribution with a mean of 100 and standard...

Round any numerical answers to 3 decimal places.
1.) A weight loss study measures each participant’s
weight before the study and then 12 weeks into the study. A sample
of 31 participants enrolled in the study and the mean difference in
their weights (computed before – after) was found to be 4.1 pounds
with a standard deviation of 3.2 pounds. In Minitab Express,
conduct a paired means t-test to determine if there is evidence
that the participants on average lost...

Question 1
Professor Nord stated that the mean score on the final exam from
all the years he has been teaching is a 79%. Colby was in his most
recent class, and his class’s mean score on the final exam was 82%.
Colby decided to run a hypothesis test to determine if the mean
score of his class was significantly greater than the mean score of
the population. α = .01.
·What is the mean score of the
population?
·What...

Test the claim that for the population of statistics final
exams, the mean score is 80 using alternative hypothesis that the
mean score is different from 80. Sample statistics include n=28,
x¯=81, and s=13. Use a significance level of α=0.05. (Assume
normally distributed population.)
The test statistic is
The positive critical value is
The negative critical value is
The conclusion is A.There is sufficient evidence to reject the
claim that the mean score is equal to 80.
B.There is not...

Test the claim that for the population of statistics final
exams, the mean score is 70 using alternative hypothesis that the
mean score is different from 70. Sample statistics include
n=20,x¯=71, and s=15. Use a significance level of α=0.05. (Assume
normally distributed population.)
The test statistic is
The positive critical value is
The negative critical value is
The conclusion is
A. There is sufficient evidence to reject the
claim that the mean score is equal to 70.
B. There is...

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