Question

A weight-lifting coach claims that weight-lifters can increase their strength by taking a certain supplement. To test the theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. Thirty days later, after regular training using the supplement, they are tested again. The results before and after taking the supplement are shown below: Athlete Before 215 240 188 212 175 260 225 200 185 After 225 245 188 210 282 275 230 195 190 Test the claim that the supplement is effective in increasing the athletes' strength, using a significance level of α = 0.05.

Answer #1

H0: The supplement is not effective in increasing the athlete's strength

H1: The supplement is effective in increasing the athlete's strength

Hence accept H0: the supplement is not effective in increasing athlete's strength

A football coach claims that players can increase their strength
by taking a certain supplement. To test the theory, the coach
randomly selects 9 athletes and gives them a strength test using a
bench press. The results are listed below. Thirty days later, after
regular training using the supplement, they are tested again. The
new results are listed below. Test the claim that the supplement is
effective in increasing the athletes' strength. Use α = 0.05.
Assume that the distribution...

A weight-lifting coach claims that a weight-lifter can increase
strength by taking vitamin E. To test the theory, the coach
randomly selects 9 athletes and gives them a strength test using a
bench press. The results are listed below. Thirty days later, after
regular training supplemented by vitamin E, they are tested again.
The new results are listed below. Find the test statistic for a
Wilcoxon signed-rank test to test the claim that the vitamin E
supplement is effective in...

Pat.#
Before
After
1
195
125
To the left is 2 datasets measured for
a sample of 107 patients with the high cholesterol level before and
after taking medication. Obtain the following for both sets:
2
208
164
3
254
152
1- the mean, mode and median
4
226
144
5
290
212
2- the variance and standard
deviation
6
239
171
7
216
164
3- First, second and third
quartiles
8
286
200
9
243
190
10
217
130...

Researchers in a 2015 study by Flannery et al. sought to
estimate the effectiveness of the seasonal influenza vaccine in
preventing acute respiratory infection (ARI). A total of 507
subjects from Texas who showed symptoms of ARI were recruited for
this study. The data provided show the result of each subject's
test for influenza.
Click to download the data in your preferred format.
CrunchIt! CSV Excel
JMP Mac-Text Minitab
PC-Text R ...

Bivariate Data & Probability
After completing the calculation by hand in Q1 you can use
Excel to check your answers before submitting. Q2 assesses your
general understanding of probability and linear associations using
Excel to analyse a large dataset.
Question 1
Covariance and Correlation
The table below shows a set of sample bivariate data. Calculate
the covariance and correlation coefficient by completing the below
table. Show all working.
X
Y
(X - )
(Y - )
(X - )(Y -...

Your firm works in construction and buys ASTM A325M8S bolts in
very large numbers. You are interested in purchasing bolts from
different suppliers and have obtained and tested samples of 200
bolts from three suppliers: Allnutt, Boltzman, Coachers.You have
tested these in your new bolt testing machine, purchased after you
had discovered your old bolt testing machine was performing
erratically. (For the purposes of this question, you are safe to
assume that the new machine works perfectly and that its...

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