Please use RSTUDIO!!!!!… | Course Hero

Please use RSTUDIO!!!!!

anal=read.csv(‘https://www.dropbox.com/s/wwls2s6rqnodpe5/anal painRed.txt?dl=1′,header=T,sep=’,’) attach(anal)

Image transcription text

5) 3. Arthritis is a very commonly occurring amiction. It is a major cause of lost work time and
often results in serious disability. Of the many types of arthritis, the most common type is
osteoarthritis. This condition is frequently due to wear and tear in the joints and is more likely
to be found in people over 50. It is very painful in the weight-bearing joints, such as the knees
and hips. Cartilage wears away on the bone ends, causing pain and swelling. Osteoarthritis
may develop after an injury such as bone fracture or a joint dislocation. In order to reduce the
amount of time osteoarthritis patients are absent from work, it is important for them to have
effective pain relief. An experiment was conducted to compare the effectiveness of three new
analgesics, A], A2, A3. A clinic evaluated a large group of patients and identified 24 patients
with a moderate level of pain. Each of the 24 persons was then randomly assigned to one of the
three analgesics. The patients were then placed on the therapies and the percentage reduction
in pain level was assessed for each patient. You can download the data using the code: anal=read.csv(‘https:ffwww.dropbox.com/s_lwwls2s6rqnodpe5lanal-painRed.txt?dl= l ‘,header=T,sep=’,’
attachfanal) (a) Check the ANOVA assumptions to see if the data is not normal. That is, construct box-
plots, residual plots and Levene’s Test to see if the assumptions for running an ANOVA are
violated. Comment on what you see for each of these? (b) Run a Kruskal—Wallis test to test for differences in the mean percentage reduction in pain
level between the 3 analgesics. Give the hypotheses for the test, the output and a conclusion. (c) Run a Dunn test to see which analgesics differ. Give the output and a well written conclu-
sion of your findings.

Show more

Answer & Explanation

Unlock full access to Course Hero

Explore over 16 million step-by-step answers from our library

Get answer

Our verified expert tutors typically answer within 15-30 minutes.

Read more here: Source link