#4.Write TRUE if the statement is correct; otherwise, write the correct form of

Question

#4.Write TRUE if the statement is correct; otherwise, write the correct form of the
sentence.
a) A researcher may use a z statistic in testing H0 : x1 = x2 against Ha: x1 > x2 .
b) To evaluate H0 : p = 0.3 versus Ha: p < 0.3, we use at statistic.
c) An approximate 95% confidence interval for an unknown proportion pis approximately fJ
plus or minus two times its standard error.
d) When performing at-test of significance, if observed samples are not independent, n
should be greater than 40.
e) To increase power of test of significance, n needs to be increased.

Explanation / Answer

Soln,

a) True

b)To evaluate Ho : p=0.3 and Ha : p <0.3, we use a Z statistic.

c) True

d)when performing a t test of significance,if observed samples are non independent, n should be at least 30.

e) True

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