Question: 1.Let X be normal random variable and Y be a Chi-square random variable withdfdegrees of freedom then the ratio x / s q r t

1.Let X be normal random variable and Y be a Chi-square random variable withdfdegrees of freedom then the ratiox/sqrt(y/df) follows (note that this is the reason we use a common test when we don't know for certain the true value of the variance):

a) AX2 distribution.

b) A normal distribution.

c) AnFdistribution.

d) A tdistribution.

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