Question

Studies are often done by pharmaceutical companies to determine
the effectiveness of a treatment program. Suppose that a new AIDS
antibody drug is currently under study. It is given to patients
once the AIDS symptoms have revealed themselves. Of interest is the
average length of time in months patients live once starting the
treatment. Two researchers each follow a different set of 50 AIDS
patients from the start of treatment until their deaths.

a. What is the population of this study?

b. List two reasons why the data may differ.

c. Can you tell if one researcher is correct and the other one is
incorrect? Why?

d. Would you expect the data to be identical? Why or why not?

e. If the first researcher collected her data by randomly selecting
40 states, then selecting 1 person from each of those states. What
sampling method is that?

f. If the second researcher collected his data by choosing 40
patients he knew. What sampling method would that researcher have
used? What concerns would you have about this data set, based upon
the data collection method?

Answer #1

from the Given data,

a)AIDS patients are the population of the study.

b)i) here in 50 patients we cant predict survival time of patient so data may differ.

ii)another reason may be drop out rate before completion of the tail.

c) If one researcher used randomisation technique and another choosing their own then researcher one is correct

compared to another.

d)data may not be identical because of dropout rate before completion of tails and un predicted survival time of patient.

e)systematic random variable.

f)If the second researcher collecting data by their own choice then this is not an appropriate trail to conduct the study.

Studies are often done by pharmaceutical companies to determine
the effectiveness of a treatment program. Suppose that a new AIDS
antibody drug is currently under study. It is given to patients
once the AIDS symptoms have revealed themselves. Of interest is the
average length of time in months patients live once starting the
treatment. Two researchers each follow a different set of 40 AIDS
patients from the start of treatment until their deaths. The
following data (in months) are collected....

. Studies are often done by pharmaceutical companies to
determine the effectiveness of a treatment program. Suppose that a
new AIDS antibody drug is currently under study. It is given to
patients once the AIDS symptoms have revealed themselves. Of
interest is the average length of time in months patients live once
starting the treatment. Two researchers each follow a different set
of 40 AIDS patients from the start of treatment until their deaths.
The following data (in months) are...

Studies are often done by pharmaceutical companies to determine
the effectiveness of a treatment program. Suppose that a new AIDS
antibody-drug is currently under study. It is given to patients
once the AIDS symptoms have revealed themselves. Of interest is the
average length of time in months patients live once starting the
treatment. Two researchers each follow a different set of 40 AIDS
patients from the start of treatment until their deaths. The
following data (in months) are collected\
Researcher...

7. A group of diners were asked how much they would pay for a
meal. Their responses were: $7.50, $25.00, $10.00, $10.00, $7.50,
$8.25, $9.00, $5.00, $15.00, $8.00, $7.25, $7.50, $8.00, $7.00.
$12.00. a. find the standard deviation of this data. Explain what
the mean and standard deviation tell you about how much the group
of diners would pay for a meal. b. Calculate the five-number
summary for this data. c. Calculate the range and IQR for this
data. d....

4. In a 1985 study of the effectiveness of streptokinase in the
treatment of patients who have been hospitalized after myocardial
infarction, 9 of 199 males receiving streptokinase and 13 of 97
males in the control group died within 12 months. In this case, you
will be asked to practice using two different types of statistical
methods to test the hypothesis.
1) If you are going to use proportional test (under normal
theory), what criteria needs to fulfill first and...

A paper described the results of a medical study in which one
treatment was shown to be better for men and better for women than
a competing treatment. However, if the data for men and women are
combined, it appears as though the competing treatment is
better.
To see how this can happen, consider the accompanying data
tables constructed from information in the paper. Subjects in the
study were given either Treatment A or Treatment B, and their
survival was...

1. Correlations and Scatter Plots
The following data set represents avg time per week spent on social
media by age for 12 randomly chosen individuals.
Age 14 18 27 21 55 46 18 26 15 17 62 41 Time (s) 240 150 135 110 45
72 150 41 200 125 31 52
a. The correlation coefficient between the two variables is found
to be r = -0.84, and the standard deviation for each variable are
Sage = 16.71 and Stime...

For each of the following scenarios, identify:
the population of interest,
the outcome variable being measured on each observational
unit,
whether the outcome variable being measured is categorical
or quantitative/Continuous,
the parameter of interest, define both in words and using the
appropriate statistical symbol (π, π1 -π2, µ, µ1 - µ2, or µd),
and
the null and alternative hypotheses, written in correct
statistical notation (not in words)
Name the hypothesis test you would use. For example, some tests
we have...

A few months ago, the upper
management at a large corporation decided they wanted to make major
changes in the organization. Leadership is concerned that employees
may be resistant to the change, and they want to find out if there
is a change management method that would help employees accept
change more effectively and keep employee satisfaction high. Two
methods they have considered are the ADKAR Framework and the Prosci
Change Management Methodology. The company wants to implement a
small...

The Million Death Study on India : The Aims of the
Study.
The Centre for Global Health Research, at the University of
Toronto, Canada, is carrying out the Million Death Study in India,
in conjunction with the Registrar General of India. This study is
one of the largest research efforts ever undertaken on the causes
of premature mortality. Led by Professor Prabhat Jha, the study
aims to help India improve the documentation of the underlying
causes and risk factors of...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 22 minutes ago

asked 45 minutes ago

asked 53 minutes ago

asked 53 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago