W o l l e g a U n i v e r s i t yC o l l e g e o f N a t u r a l a n d C o m p u t a t i o n a l S c i e n c e s

D e p a r t m e n t o f c o m p u t a t i o n a l s c i e n c e s –S t a t i s t i c s P r o g r a m m e - I I y e a r

T e s t 2 S T A T 2 0 4 3

Page 1S T A T 2 0 4 3

1. The appropriate test statistic used for comparing the difference in two

population means, μ1−μ2 in the completely randomized design is

2. Test whether the yields of two types of wheat have the same variance.

We obtained S

12=17 for weight of 16 plots of one type of wheat and

S22=29

for the weight of 12 plots of the second type. Is there a reason

to doubt at 1% level of significance that the population variances are

equal?

W o l l e g a U n i v e r s i t yC o l l e g e o f N a t u r a l a n d C o m p u t a t i o n a l S c i e n c e s

D e p a r t m e n t o f c o m p u t a t i o n a l s c i e n c e s –S t a t i s t i c s P r o g r a m m e - I I y e a r

T e s t 2 S T A T 2 0 4 3

Page 1S T A T 2 0 4 3

1. Fill in the Blanksa. Every process or experiment are a sequence of values which varies, such observations

can also be called as ________ b. ___________ is a very useful way to display data, we may get the range of the

distribution , the lower and upper quartiles, and also the median In some experimental study, the whole experimental unit divided into relative is called ________

c. The individual runs differ, that is with fluctuations or variations, these variations can also be referred as________in the result

d. If we are testing the difference in two population means and cannot

reasonably assume that the variances σ

12and σ

22are equal, then the

two sample t-test must be modified slightly. The test statistic becomes

__________

Answers for filling in the blanks

S.No Answersa.b.c.d.