If you want to prepare a single-plot screen, you write ....

Select one:

a. screen(mfrow=c(1,1))

b. parameter(frow=c(1,1))

c. par(mfrow=c(1,1))

d. mfrow=c(1,1)

2

You write .... for correlation of a abd b.

Select one:

a. correl(a,b)

b. cor(a,b)

c. cr(a,b)

d. correlation(a,b)

3

f you want to test the hypothesis that x is different from 100 with non-parametric test, you write ......

Select one:

a. wilcox.test(X,mu=100)

b. nonpar.test(X,mu=100)

c. test(X,mu=100)

d. nonpar(X,mu=100)

4

Before and after are matched observation and if you want compare, you write .....

Select one:

a. ttest(before,after,paired=TRUE)

b. t.test(before,after,paired=TRUE)

c. difference(before,after,paired=TRUE)

d. ttestdiffer(before,after,paired=TRUE)