QMB 3250 exam 1 with answers

QMB 3250 exam 1 with answers

sampling distribution assumptions - ANSWER: ➡ means: at least 30, random, independent,
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10%
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proportions: at least 10 successes and failures, random, independent, 10%
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standard deviation of the sample mean - ANSWER: ➡ find standard error
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chi square test assumptions - ANSWER: ➡ random, independent, categorical, at least 5
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chi-square test for independence - ANSWER: ➡ two groups of categorical data
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chi squared test of homogeneity - ANSWER: ➡ single categorical group many
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responses/populations
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chi-square goodness of fit - ANSWER: ➡ comparing to historical data, comparing an observed
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and expected
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t distribution as we change degrees of freedom - ANSWER: ➡ increase DF, less spread out
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(closer to z distribution).... decrease DF more spread out
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for pooled or separate - ANSWER: ➡ use hypothesis test for two means on JMP
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1 quantitative variable - ANSWER: ➡ histograms, dot plots, stem and leaf, box plots
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2 quantitative variables - ANSWER: ➡ scatter plots
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