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#1
08-09-2012
 USMLE Forums Master Steps History: --- Posts: 1,366 Threads: 649 Thanked 695 Times in 416 Posts Reputation: 705
T test or Chi Square or ANOVA?

An article concerning the relative ability of a new drug to lower systolic blood pressure describes a study in which age and ethnicity-matched male patients are divided into three groups. One group receives a well recognized drug at a standard dose. The other two groups receive the new drug, but at different doses. At the end of 30 days, the systolic blood pressure of each group was determined, and the significance of the differences in the mean values was tested statistically.

Which of the following statistical tests would provide the greatest confidence in the results?

(A) Student’s t-test
(B) Analysis of variance
(C) Correlation coefficient
(D) Chi-squared test
(E) Logistic regression

***can it come in ck ?

#2
08-09-2012
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i think its B) Analysis of variance

it says 3 groups. >2 groups is ANOVA.
 The above post was thanked by: tyagee (08-09-2012)
#3
08-09-2012
 USMLE Forums Newbie Steps History: Step 1 Only Posts: 5 Threads: 2 Thanked 1 Time in 1 Post Reputation: 11

Quote:
 Originally Posted by moske i think its B) Analysis of variance it says 3 groups. >2 groups is ANOVA.

my answer would be One way ANOVA since it involves 1 interval variable(blood pressure) and 1 nominal variable(treatment/control); but the nominal variable has more than 2 groups which is why we chose one-way ANOVA.
 The above post was thanked by: tyagee (08-09-2012)

#4
08-10-2012
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,216 Threads: 41 Thanked 1,365 Times in 722 Posts Reputation: 1380

ANOVA or analysis of variance is the option here, anything that comprises more than 2 variables (i.e) 3 is ANOVA
#5
08-10-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,866 Threads: 149 Thanked 2,249 Times in 1,096 Posts Reputation: 2269

t-test checks difference between the means of 2 groups.

ANOVA checks difference between the means of 3 or more groups.

x2 (chi-square) test checks difference between 2 or more percentages or proportions of
categorical outcomes (not mean values) .
#6
08-10-2012
 USMLE Forums Master Steps History: --- Posts: 1,366 Threads: 649 Thanked 695 Times in 416 Posts Reputation: 705

Quote:
 Originally Posted by Novobiocin t-test checks difference between the means of 2 groups. ANOVA checks difference between the means of 3 or more groups. x2 (chi-square) test checks difference between 2 or more percentages or proportions of categorical outcomes (not mean values) .
chisquare in interval data ONLY... that what you meant ..right ?

 Tags Biostatistics-Epidemiology, Step-2-Questions

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