Question
In: Math
You test a new drug to reduce blood pressure. A group of 15 patients with high...
You test a new drug to reduce blood pressure. A group of 15 patients with high blood pressure report the following systolic pressures (measured in mm Hg): before medication: after medication: change: ̄y s 187 120 151 143 160 168 181 197 133 128 130 195 130 147 193 187 118 147 145 158 166 177 196 134 124 133 196 130 146 189 156.40 0 2 4 -2 2 2 4 1 -1 4 -3 -1 0 1 4 1.133 27.409 27.060 2.295 a) Calculate a 90% CI for the change in blood pressure. b) Calculate a 99% CI for the change in blood pressure. c) Does either interval (the one you calculated in (a) or (b)) include 0? Why is this important? d) Now conduct a one sample t-test using μ = 0, and α = .10. Are the results consistent with (a)? e) Finally, conduct a one sample t-test using μ = 0, and α = .01. Are the results consistent with (b)?
Solutions
milcah answered 1 year agoRelated Solutions
1) You test a new drug to reduce blood pressure. A group of 15 patients with...
1) You test a new drug to reduce blood pressure. A group of 15
patients with high blood pressure report the following systolic
pressures (measured in mm Hg): ̄y s before medication: 187 120 151
143 160 168 181 197 133 128 130 195 130 147 193 157.53 27.409 after
medication: 187 118 147 145 158 166 177 196 134 124 133 196 130 146
189 156.40 27.060 change: 0 2 4 -2 2 2 4 1 -1 4 -3...
A group of five individuals with high blood pressure were given a new drug that was...
A group of five individuals with high blood pressure were given
a new drug that was designed to lower blood pressure. Systolic
blood pressure was measured before and after treatment for each
individual, with the following results:
Subject
Before
After
1
172
145
2
164
132
3
168
129
4
158
135
5
183
145
Let μX represent the population mean before treatment and let μY
represent the population mean after treatment. Find a 90%
confidence interval for the difference...
23. A group of five individuals with high blood pressure were given a new drug that...
23. A group of five individuals with high blood pressure were
given a new drug that was designed to lower blood pressure.
Systolic blood pressure was measured before and after treatment for
each individual. The mean and standard deviation for the before
treatment were 168.6 and 9.3, respectively. The mean and standard
deviation for the after treatment were 137.2 and 7.4, respectively.
The 90% confidence for the mean reduction in systolic blood
pressure is nearly?
A researcher has developed a new drug designed to reduce blood pressure. In an experiment, 21...
A researcher has developed a new drug designed to reduce blood
pressure. In an experiment, 21 subjects were assigned randomly to
the treatment group, and received the new experimental drug. The
other 23 subjects were assigned to the control group, and received
a standard, well known treatment. After a suitable period of time,
the reduction in blood pressure for each subject was recorded. A
summary of these data is:
n
x? s
Treatment group (new
drug):
21 23.48
8.01...
A company claims that its new drug is effective is lowering blood pressure. To test this...
A company claims that its new drug is effective is lowering
blood pressure. To test this claim, an independent clinic tested
the drug on 6 volunteers. Below are the blood pressures before and
after taking the new drug.
BP Before Drug
142
130
145
129
138
126
BP After Drug
120
110
140
115
125
110
(a) What tailed test is this? (i.e., RIGHT,
LEFT, or TWO-TAILED?)
(b) What is the value of the "Test
Statistic"?
(c) What is...
Researchers were interested in determining a new drug for reducing high blood pressure. They obtained a...
Researchers were interested in determining a new drug for
reducing high blood pressure. They obtained a sample of volunteers
for the study and randomly divided them into two groups, C and T. A
single medical practitioner, Dr. Daring, agreed to help the
researchers in this study following a protocol of three steps: (i)
The blood pressure of each subject was measured by Dr. Daring; (ii)
the new drug was administered to subjects in group T and a placebo
to subjects...
five individuals with high blood pressure were given a new drug to see if it would...
five individuals with high blood pressure were given a new drug
to see if it would lower their blood pressure. systolic blood
pressure was measured before and after treatment for each
individual. the results are below.
before: person 1= 170 person 2= 164 person 3= 168 person 4= 158
person 5= 183
after: person 1= 145 person 2= 132 person 3= 129 perosn 4= 135
perosn 5= 145
construct a 95% confidence interval for mean reduction in
systolic blood pressure,...
Drugs are often used for reducing the blood pressure of hypertensive patients (those with high blood...
Drugs are often used for reducing the blood pressure of
hypertensive patients (those with high blood pressure). An
experiment was run to investigate the effect of Drug (A or B) and
Dose Level (Low or High) on the reduction in blood pressure. The
experiment was conducted separately for the 36 patients who had
mild hypertension and the 24 patients who had severe hypertension
as the researcher suspected that results may differ for the two
groups. For this design, there are:
A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure...
A pharmaceutical company claims that its new drug reduces
systolic blood pressure. The systolic blood pressure (in
millimeters of mercury) for nine patients before taking the new
drug and 2 hours after taking the drug are shown in the table
below. Is there enough evidence to support the company's claim? Let
d = (blood pressure before taking new drug) − (blood pressure after
taking new drug). Use a significance level of α = 0.05 for the
test. Assume that the...
A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure...
A pharmaceutical company claims that its new drug reduces
systolic blood pressure. The systolic blood pressure (in
millimeters of mercury) for nine patients before taking the new
drug and 2 hours after taking the drug are shown in the table
below. Using this data, find the 99% confidence interval for the
true difference in blood pressure for each patient after taking the
new drug. Assume that the blood pressures are normally distributed
for the population of patients both before and...
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