2.The statistic (n- 1)s2/σ2has a chi-squared distribution withn- 1 degrees of freedom if:a.the sample has a Studentt-distribution with degrees of freedom equal ton -b.the sample is normally distributed with variance equal tos2c.the population is normally distributed with variance equal toσ2d.All of these choices are true.1...
3.Which of the following conditions is needed regarding the chi-squared test statistic forthe test of variance?
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4.In a hypothesis test for the population variance, the hypotheses areH0:σ2= 30 vs.H1:σ2< 30. If the sample size is 20 and the test is being carried out at the 5% level ofsignificance, the null hypothesis is rejected if:
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5.In a hypothesis test for the population variance, the hypotheses areH0:σ2= 100 vs.Hσ2≠100. If the sample size is 15 and the test is being carried out at the 10% level ofsignificance, the rejection region is:1:
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