Question

using welchs approximation method

7.2.7 Heart disease patients often experien the coronary arteries. Because biologicl a role in these spasms, a research team m levels in coronary arteries that were obtain tem from patients who had died of heast om Use ni biological amines maynf measured av: y pl amine and causes. The accompanying table summa tration of the amine serotonin.8 a control group of patients who had die se te cau concen- Serotonin (NG/GM) Heart disease Controls 3,840 850 12 5,310 640 SE (a) For these data, the SE of (Y Y2) is 1,064 and df 14.3 (which can be rounded to 14). Use a t test compare the means at the 5% significance level. (b) Verify the value of SE(y,-y) given in part (a) 7.2.8 In a study of thg oriodi

Answer 1

Ans:

a)

Test statistic:

t=(3840-5310)/1064

t=-1.382

df=14

p-value=tdist(1.382,14,2)=0.1886

As,p-value>0.05,we fail to reject the null hypothesis and can conclude that there is no difference in means.

b)

standard error for difference=SQRT(850^2+640^2)=1064