Question

A researcher wishes to see if there is a difference in the cholesterol levels of two groups of men. A random sample of 30 men between the ages of 25 and 40 is selected and tested. The average level is 223. A second sample of 25 men between the ages of 41 and 56 is selected and tested. The average of this group is 229. The population standard deviation for both groups is 6. At a 0.0l significance level, is there a difference in the cholesterol levels between the two groups? Perform a hypothesis test.

Answer #1

A researcher wishes to test a hypothesis, using a 5% level of
significance, to see if the average level of cholesterol can be
reduced from using a medical treatment for a particular population.
If one wishes to perform a one-side one-sample t test, and wishes
that the t test to have a power of 0.80 to detect a reduction of
10mg/100ml in cholesterol (LDL), how large a sample would be
needed? (From a pilot study, the estimated standard deviation of...

A medical researcher wishes to try three different techniques to
lower cholesterol levels of patients with high cholesterol levels.
The subjects are randomly selected and assigned to one of three
groups. Group 1 is given medication, Group 2 is given an exercise
program, and Group 3 is assigned a diet program. At the end of six
weeks, each subject's cholesterol level is recorded. Determine the
test statistic F-value to test the hypothesis that there is no
difference among the means....

As part of a research program for a new cholesterol drug, a
pharmaceutical company would like to investigate the relationship
between the ages and LDL (low-density lipoprotein) cholesterol of
men. The accompanying data set shows the ages and LDL cholesterol
levels of seven randomly selected men. Construct a 95% prediction
interval to estimate the LDL cholesterol level of a 35-year-old
man.
Age
24
37
25
33
41
32
41
Cholesterol
145
175
156
200
157
145
206
UPL=
LPL=

A researcher wishes to see whether there is any difference in
the weight gains of athletes following one of three special diets.
Athletes are randomly assigned to three groups and placed on the
diet for six weeks. The weight gains (in pounds) are shown below.
At α = 0.10, can the researcher conclude that there is a difference
in the diets?
Diet A
Diet B
Diet C
3
10
8
7
12
3
6
11
2
4
14
5
a)...

A researcher wishes to determine whether there is a difference
in the mean age of middle school, high school, and college
teachers. Teachers are randomly selected. Their ages are recorded
below. Find the P-Value.
Middle School Teachers
High School Teachers
College Teachers
23
38
45
28
36
45
27
41
39
37
47
61
52
42
36
25
31
35
Group of answer choices
0.3571
0.2357
0.1142
0.2289

As part of a research program for a new cholesterol drug, a
pharmaceutical company would like to investigate the relationship
between the ages and LDL (low-density lipoprotein) cholesterol of
men. The accompanying data set shows the ages and LDL cholesterol
levels of seven randomly selected men. Construct a 95% prediction
interval to estimate the LDL cholesterol level of a 24-year-old
man.
Age: 24, 37, 26, 31, 41, 32, 41
Cholesterol: 145, 180, 160, 199, 155, 144, 210

A pharmaceutical company introduced a new drug that would reduce
cholesterol levels. A researcher selected 10 cholesterol patients
and tested them for their cholesterol level. The subjects were then
placed on the new drug for a period of 6 months, and the
cholesterol level reading was taken again. Both the results are
given below. Assume the samples are random and dependent, and the
populations are normally distributed. Use 0.01 level of
significance and test whether there is evidence of reduced...

1. Several baseline studies are conducted on X = “cholesterol
level (mg/dL)” in a certain population of individuals. From the
given information described below for each of these studies, choose
the LETTER of the most appropriate statistical test to be
implemented, from the following list. Note: For each study, there
is only one correct choice of test. However, a given statistical
test can be the correct choice for more than one study. For
example, choice A could be the correct...

A researcher in obstetrics believes that pregnancy causes
cholesterol levels to rise in women. Suppose the mean cholesterol
level for all American women is 200 with a standard deviation of
42. The researcher samples 36 pregnant women and finds their
average cholesterol level is 215.4. Is there enough evidence to
support the researchers beliefs using a .01 significance level?
(Use the Critical Value Approach!)

A new drug to treat high cholesterol is being tested by
pharmaceutical company. The cholesterol levels for 18 patients were
recorded before administering the drug and after. The average
difference in cholesterol levels (after - before) was 4.19 mg/dL
with a standard deviation of 8.055 mg/dL. Using this information,
the calculated 90% confidence paired-t interval is (0.887, 7.493).
Which of the following is the best interpretation of this
interval?
Question 8 options:
1)
The proportion of all patients that had...

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