Question

A study of 10 different weight loss programs involved 500 subjects. Each of the 10 programs had 50 subjects in it. The subjects were followed for 12 months. Weight change for each subject was recorded. The researcher wants to test the claim that all ten programs are equally effective in weight loss. (a) Which statistical approach should be used? (i) confidence interval (ii) t-test (iii) ANOVA (iv) Chi square (b) Explain the rationale for your selection in (a). Specifically, why would this be the appropriate statistical approach?

Answer #1

a)iii)ANOVA.

Let us consider each weight loss programs as treatments and we are interested whether the between group variances vary that is whether the group means are all equal or atleast one is different.If the group emans are all equal then it will mean that all the ten types of weight loss programs are equally effective otherwise not. Hence this is a classic ANOVA setup. Moreover we are interested in the between group variabuility rather than the within group variability.

Here the groups are the group of subjects in each weight loss programs.

What is the appropriate statistical analysis to use: t-test for
two independent samples, t-test for dependent samples, ANOVA, or
chi-square test of independence? Please identify and explain why it
is appropriate. (a) A study was conducted to see whether monetary
incentives to use less water during times of drought had an effect
on water usage. Sixty single-family homeowners were randomly
assigned to one of two groups: 1) monetary incentives and 2) no
monetary incentives. At the end of three months,...

[3] A nutrition expert is examining a weight-loss program to
evaluate its effectiveness.
Ten subjects are randomly selected for the investigation, the
data are as follows:
Subject 1 2 3 4 5 6 7 8 9 10
Initial Weight 180 142 126 138 175 205 116 142 157 136
Final Weight 165 138 128 136 170 197 115 128 144 130
Is there evidence of significant weight loss?
Run the appropriate test at 5% level significance.
USE R AND SHOW...

In a study about dieting and weight loss, N=80 subjects were
gathered to participate. All of the participants were approximately
20-25% overweight (from their ideal weight), with no habits of
exercising. The researchers randomly assigned these participants
into four different categories: participants in Category I (N=20)
ate the traditional low-caloric diet, participants in Category II
(N=20) ate the ketogenic diet, participants in Category III (N=20)
were told to eat whatever they want as if they were not on a diet...

Write a summary of your understanding of the study (below
abstract ). In your ownsummary (or your first comment), you need to
refer to the article and explain what the researchers did. You do
not have to compute anything, but explain the idea central to the
study.
Abstract: The Chi-square statistic is a non-parametric
(distribution-free) tool designed to analyze group differences when
the dependent variable is measured at a nominal level. Like all
non-parametric statistics, the Chi-square is robust with...

10 subjects in a study were randomly assigned into two
equally sized groups. One group was shown a short video on how to
fold paper cranes. The other group was given an instruction booklet
on how to do so. They were then asked to make paper cranes for the
next hour. The number of paper cranes each subject made was
recorded and is listed in the table below. The researchers are
interested in whether there was a difference in the...

What Statistical Test Should I Use
Please indicate the type of test needed to analyze the data
described.
Hints: Think about the IV and DV. How many levels of
the IV? Are they repeated measures? Are the data
categorical?
A. z-test
B. One-Sample t-Test
C. Dependent Measures t-Test
D. Independent Measures t-Test
E. One-way ANOVA
E. One-way ANOVA
F. Post-hoc tests
G. Between-Subjects Factorial ANOVA
H. Chi-Square test of Independence
________ 1. Compare spatial task scores after 0 or 3 drinks....

In February 2012, the Pepsi Next product was launched into
the US market. This case study provides students with an
interesting insight into PepsiCo’s new product process and some of
the challenging decisions that they faced along the way.
Pepsi Next Case Study
Introduction
Pepsi Next was launched by PepsiCo into the US market in
February 2012, and has since been rolled out to various
international markets (for instance, it was launched in Australia
in September 2012).
The new product...

MATHEMATICS
1. The measure of location which is the most likely to
be
influenced by extreme values in the data set is the a. range
b.
median c. mode d. mean
2. If two events are independent, then a. they must be
mutually
exclusive b. the sum of their probabilities must be equal to one
c.
their intersection must be zero d. None of these alternatives
is
correct. any value between 0 to 1
3. Two events, A and B,...

Delta airlines case study
Global strategy. Describe the current global
strategy and provide evidence about how the firms resources
incompetencies support the given pressures regarding costs and
local responsiveness. Describe entry modes have they usually used,
and whether they are appropriate for the given strategy. Any key
issues in their global strategy?
casestudy:
Atlanta, June 17, 2014. Sea of Delta employees and their
families swarmed between food trucks, amusement park booths, and
entertainment venues that were scattered throughout what would...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 20 minutes ago

asked 30 minutes ago

asked 40 minutes ago

asked 48 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago