confidence interval

Question

6. If all other factors are held constant, increasing the sample size will do the following. increase the

width of the confidence interval

decrease the width of the confidence interval

None of the other choices are correct.

increase the standard error

7. 

In general, a large value for a t statistic (far from zero) is an indication that the sample data are not consistent with the null hypothesis.

True or false

9. 

The t distribution is symmetrical and has a mean of zero.

True

False

(b) The probability in part (b) is much higher because the standard deviation is smaller for the x distribution.

The probability in part (b) is much higher because the standard deviation is larger for the x distribution.

The probability in part (b) is much higher because the mean is smaller for the x distribution.

The probability in part (b) is much lower because the standard deviation is smaller for the x distribution.

The probability in part (b) is much higher because the mean is larger for the x distribution.

10.

Rejecting the null hypothesis means that the sample outcome is very unlikely to have occurred if H0 is true.

True

False

 
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