Question
i. The test statistic t has n -1 degrees of freedom. ii. All t distributions have the same mean of zero and a standard deviation
i. The test statisticthasn-1 degrees of freedom.
ii. Alltdistributions have the same mean of zero and a standard deviation of 1.
iii. Thetdistribution is more spread out and flatter at the center than is the standard normal distribution. However, as the sample size increases, thetdistribution curve approaches the standard normal distribution.
Select one:
A.(iii) is a correct statement but not (i) or (ii).
B.(i), (ii), and (iii) are all false statements.
C.(ii) and (iii) are correct statements but not (i).
D.(i), (ii), and (iii) are all correct statements.
E.(i) and (iii) are correct statements but not (ii).
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