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单选题 The degrees of freedom for a table with 6 rows and 3 columns is
学科：默认课程
时间：2026-01-06 23:26:08
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题目1单选题
If there are three or more populations, then it isA. possible to test for equality of three or more population proportionsB. impossible to test for equality of the three population proportions, because chi-square tests deal with only two populationsC. customary to use a t distribution to test for equality of the three population proportionsD. reasonable to test for equality of multiple population proportions using chi-square lower tail tests
题目2单选题
The sampling distribution for a goodness of fit test is theA. Poisson distributionB. t distributionC. normal distributionD. chi-square distribution
题目3单选题
The number of degrees of freedom associated with the chi-square distribution in a test of independence isA. number of sample items minus 1B. number of populations minus 1C. number of rows minus 1 times number of columns minus 1D. number of populations minus number of estimated parameters minus 1
题目4单选题
A statistical test conducted to determine whether to reject or not reject a hypothesized probability distribution for a population is known as aA. comparison testB. probability testC. goodness of fit testD. normality test
题目5单选题
The degrees of freedom for a table with 6 rows and 3 columns isA. 18B. 15C. 6D. 10
题目6单选题
Marascuilo procedure is used to test for a significant difference between pairs of populationA. proportionsB. meansC. variancesD. standard deviations
题目7单选题
Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.Freshmen 83Sophomores 68Juniors 85Seniors 64We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. The expected number of freshmen isA. 83B. 90C. 30D. 10
题目8单选题
Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.Freshmen 83Sophomores 68Juniors 85Seniors 64We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. The calculated value for the test statistic equalsA. 54B. 65C. 1.66D. 6.66
题目9单选题
Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.Freshmen 83Sophomores 68Juniors 85Seniors 64We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. At a .05 level of significance, the null hypothesisA. should not be rejectedB. should be rejectedC. was designed wrongD. cannot be tested
题目10单选题
The table below gives beverage preferences for random samples of teens and adults. Teens Adults TotalCoffee 50 200 250Tea 100 150 250Soft Drink 200 200 400Other 50 50 100total 400 600 1000We are asked to test for independence between age (i.e., adult and teen) and drink preferences. The test statistic for this test of independence isA. 0B. 8.4C. 62.5D. 82.5
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