Cancer A study was performed in Basel, Switzerland, on the re- lationship between the concentration of plasma antioxi- dant vitamins and cancer risk [6]. Table 7.4 shows data for plasma vitamin-A concentration for stomach-cancer cases and controls. 1.51 If we assume that the mean plasma vitamin-A con- centration among controls is known without error, then
Cancer A study was performed in Basel, Switzerland, on the re- lationship between the concentration of plasma antioxi- dant vitamins and cancer risk [6]. Table 7.4 shows data for plasma vitamin-A concentration for stomach-cancer cases and controls. 1.51 If we assume that the mean plasma vitamin-A con- centration among controls is known without error, then
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Please answer the following questions using R
![Table 7.4 Plasma vitamin-A concentration (µmol/L)
for stomach-cancer cases and controls
Stomach-cancer cases
Controls
Mean
2.65
2.88
se
0.11
n
20
2421
what procedure can be used to test whether the mean
concentration is the same for stomach-cancer cases and
controls?
7.52 Perform the test in Problem 7.51, and report a p-value
(two-sided).
7.53 How many stomach-cancer cases are needed to
achieve 80% power if the mean plasma vitamin-A con-
centration among controls is known without error, the true
difference in mean concentration is 0.20 umol/L, and a two-
sided test is used with α = .05?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc6389447-1237-4af0-b5c6-eb1260425b55%2Ff0cd84b8-cb4e-4175-bb37-c91d66355043%2Fswl9rnr_processed.png&w=3840&q=75)
Transcribed Image Text:Table 7.4 Plasma vitamin-A concentration (µmol/L)
for stomach-cancer cases and controls
Stomach-cancer cases
Controls
Mean
2.65
2.88
se
0.11
n
20
2421
what procedure can be used to test whether the mean
concentration is the same for stomach-cancer cases and
controls?
7.52 Perform the test in Problem 7.51, and report a p-value
(two-sided).
7.53 How many stomach-cancer cases are needed to
achieve 80% power if the mean plasma vitamin-A con-
centration among controls is known without error, the true
difference in mean concentration is 0.20 umol/L, and a two-
sided test is used with α = .05?
![Cancer
A study was performed in Basel, Switzerland, on the re-
lationship between the concentration of plasma antioxi-
dant vitamins and cancer risk [6]. Table 7.4 shows data for
plasma vitamin-A concentration for stomach-cancer cases
and controls.
1.51 If we assume that the mean plasma vitamin-A con-
centration among controls is known without error, then](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc6389447-1237-4af0-b5c6-eb1260425b55%2Ff0cd84b8-cb4e-4175-bb37-c91d66355043%2Frg3c5ri_processed.png&w=3840&q=75)
Transcribed Image Text:Cancer
A study was performed in Basel, Switzerland, on the re-
lationship between the concentration of plasma antioxi-
dant vitamins and cancer risk [6]. Table 7.4 shows data for
plasma vitamin-A concentration for stomach-cancer cases
and controls.
1.51 If we assume that the mean plasma vitamin-A con-
centration among controls is known without error, then
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