With which statistical test do we determine the probability of getting the obtained results or those more extreme assuming the differences in results were due to chance alone?
a. sign test c. t test
b. z test d. all of these
As the df increases, the t distribution _________.
a. gets more symmetrical c. stays the same
b. approaches the normal distribution d. becomes more skewed
Which of the characteristics below distinguishes the t statistic from the z statistic?
a. the proportion of area beyond a particular positive t value is equal to the proportion of area below the corresponding negative t
b. the z distribution has a mean of zero while the t distribution does not
c. In the t distribution the area under the curve beyond a value of 1.96 is greater than that of the normal curve
d. all of these
In a t test, when the size of the sample is increased, the confidence interval _________.
a. increases c. stays the same
b. decreases d. changes shape
When using the t test, we reject H0 _________.
a. if tobt tcrit c. if tobt tcrit
b. if tobt tcrit d. if tobt tcrit
Which of the following represents a sampling distribution?
a. the binomial distribution
b. the z distribution
c. the t distribution
d. all of these
e. the z and t distributions
tcrit for any alpha level is _________ zcrit for N less than infinity.
a. greater than c. less than
b. the same as d. none of these
Power is an esoteric topic that has very little practical utility.
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Power is independent of the magnitude of the independent variable's effect.
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By using a stringent alpha level, and designing the experiment for high power, we maximize the probability of correctly concluding regardless of whether H0 is true or false.
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