1. In a hypothesis test, an extreme z-score value, like z+3 or z+4, means that t
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Question
1. In a hypothesis test, an extreme z-score value, like z+3 or z+4, means that the sample mean is 3 or 4 standard deviations away from the population mean under the null hypotheses. means that you should probably reject the null hypothesis is strong evidence of a statistically significant effect all of the other options are correct. a. b. c. d. 2. Which of the following statement regarding t and z distributions is incorrect a. z distribution is also called standardized normal distribution b. z critical values are determined by the z distribution and the alpha level c. t distribution is a family of distribution, one for each degrees of freedom d. t critical values are determined by the t distribution and the alpha level 3. If a researcher reports a single sample t statistic with df-20, how many individuals were in the sample? a. n 19 b. n 20 c. n-21 d. cannot be determined from the information given 4. When n is small (less than 30), the t distribution a. is almost identical in shape to the normal z distribution b. is flatter and more spread out than the normal z distribution c. is taller and narrower than the normal z distribution d. cannot be specified, making hypothesis tests impossibleExplanation / Answer
1) D ) all of the other options are correct.
2) D ) to find t critical we need alpha level and degree of freedom, for each degree of freedom there is different t curve.
3) A ) df = 20-1=19
4) B ) is flatter and more spread out than the normal z distribution.
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