Question

1) If a test is robust, what does this allow us to do? Be as detailed as possible (although we are not looking for a long answer).

2) When we state that there is homogeneity of variance, precisely which variances are homogeneous? Use words, not symbols.

Answer #1

(1)

If a test is robust against a particular assumtion, this allows
us **to relax that assumption in the statistical
modeling.** For example, t test is robust against the
assumption of normality condition of population, it is valid for
comparing approximately normally distributed groups. F test is not
robust against the assumption of normality condition of population,
because F test is very sensitive to non-normality and therefore
invalid for approximat normality.

(2)

When we state that there is homogeneity of variance, precisely
**the population variances of all comparison groups**
are homogeneous. The Levene's test uses an F test to test the null
hypothesis that the variance is equal across groups. In ANOVA, when
the homogeneity of variance is violated, there is greater
probability offasely rejecting the null hypothesis.

A) If a test is robust, what does this allow us to do? Be as
detailed as possible
B) When we state that there is homogeneity of variance,
precisely which variances are homogeneous? Use words, not
symbols.
C) It is important to keep the probability of making Type I
equal to α. With a t-test, how do we keep the probability of Type I
error in check?

If a test is robust, what does this allow us to do? Be as
detailed as possible (although we are not looking for a long
answer).

1. If a test is robust, what does this allow us to do?
2.When we state that there is homogeneity of variance, precisely
which variances are homogeneous?
3.If you underestimate sigma, the standard deviation of the
population, the result is
a. the t-statstic being too small
b. a smaller probability of type i error
c. the estimated standard error being too large
d. all of the above
e. none of the above

When we state that there is homogeneity of variance, precisely
which variances are homogeneous? Explain using words.

What does random assignment do in an experiment that makes it so
useful?
It allows us to be able to interpret the results of an
experiment because we know that the groups we study are not the
same at all and we want them to be as different as possible.
It gives us confidence that the statistics we use in experiments
can't be made up.
It provides us with some confidence that the groups we are
studying are basically the...

1)Ho do physical observations and the shape of molecules allow
us to predict what types of intermolecular forces dominate in a
mixture?
2)is isopropanol soluble in water? how do you know? identify
the major intermolecular force which you think leads your observed
outcome
3)comparing a yellow and blue colored solution containing
ammonium sulfate, water and isopropanol, would you say that the
dyes have a stronger attraction to isopropanol or to the water when
the salt is present? does the presence...

6. A researcher wishes to test the effect of early discharge of
cardiac patients on their ability to cope at home. The researcher
administers the coping scale to 10 cardiac patients who were
discharged early and 10 patients who stayed in the hospital for a
longer period of time. Higher scores indicate better coping. Based
on the data given in the table below, can you conclude that early
discharge has an effect on cardiac patients’ on ability to cope at...

1. Which of the following does a box plot not display?
a. The range
b. The interquartile range
c. The lower quartile
d. The mean
2. You have income data for your entire customer database. Some
of your clients are far wealthier than others. Which of the
following do outliers least affect?
a. The range
b. The mean
c. The median
d. The standard deviation
3. Some data were collected about consumer loyalty towards a
(relatively) new brand of toilet...

1. What are economic evaluations? What information do they
provide to us? Why does society use economic evaluations when it
comes to health care?
2. Describe the three types of economic evaluations that are
performed and types of health outcomes that are used for the
analyses. What are the drawbacks in these types of evaluations?
3. How are economic evaluations utilized in healthcare?
4. What are the areas of concern in the pharmaceutical industry
and why? How are these concerns...

In this discussion answer the following questions
1) In conducting an Analysis of Variance Test what are we
actually testing?
2) What are the main requirement for the test.
3) Which of those requirement do you think is the most difficult
to established.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 9 minutes ago

asked 54 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour 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