Question

4 Pooled t Test Yes-No Assuming equal variances Difference 18.3974 t Ratio 2.3361 Std Err Dif 7,8753 DF 48 Upper CL Dif Lower CL Dif 34.2317 Prob > It 2,5631 Prob > t 0.0237 0.0119 O 10 20 Confidence 0.95 Prob F Source DF Squares Mean Square 0.0237 Chemo Yes/No 4224.051 4224.05 5.4574 1 A Error 48 37152.449 774.01 C. Total 49 41376.500 4 Means for Oneway Anova Mean Std Error Lower 95% Upper 95% Level Number diNo 5.4562 11.299 26 22.2692 33.240 40.6667 5.6789 29.248 24 52.085 Yes Std Error uses a pooled estimate of error variance 21. What is being compared using the t test? A. 22.27 B. 40.67 C. 24 D. 26 E. Both A and B F. Both C and D 22. What is the confidence interval of the difference? A. 0.00 to 2.56 B. 0.00 to 34.23 C. 2.56 to 34.23 D. -2.34 to +2.34 23. What is the p-value for this test and is it statistically significant? 01 001 A. 0.0237, Yes B. 0.0119, Yes C. 0 Ho: HNo lYes

Answer 1

22)
option C)
see first table upper CI diff and lower CI diff
23)
p-value - 0.0237   { Prob > |t| for 2-tailed test}
option A)

24)
option C) and D) are correct
if p-value < alpha, we reject the null hypothesis

25)

option C)
it will be right-tailed

26)
p-value will be 0.0119
again p-value < alpha
we reject the null hypothesis

option C)