StatTutor Lesson - Conditional Distributions

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      Questions 1-5

      280

      Question 1.

      True or false: When creating a marginal distribution or a conditional distribution, the denominator is the same for all fractions in the distribution.

      A.
      B.

      Incorrect. This is a correct statement because the fractions in the distribution must add to 1.0. Thus, the denominator has to be the same for all fractions.
      Correct. This is a correct statement because the fractions in the distribution must add to 1.0. Thus, the denominator has to be the same for all fractions.
      Incorrect. Try again.
      2

      Question 6

      325

      Question 6.

      Which conditional distributions are easier to compare?

      A.
      B.

      Incorrect. Some might prefer column conditional distributions for comparison, but most people prefer row conditional distributions for comparison.
      Correct. Some might prefer column conditional distributions for comparison, but most people prefer row conditional distributions for comparison.
      Incorrect. Try again.
      2

      Questions 7-8

      415

      Question 7.

      When do the data in a two-way table indicate no association between the row and column variables?

      A.
      B.

      Incorrect. When responses for one variable are NOT associated with responses for the other variable, the row conditionals are should be about the same.
      Correct. When responses for one variable are NOT associated with responses for the other variable, the row conditionals are should be about the same.
      Incorrect. Try again.
      2

      Questions 9-10

      472

      Question 9.

      Should a woman ask a man out on a date?
      Yes No Depends Total
      Men 0.35 0.17 0.48 1.00
      Women 0.16 0.36 0.48 1.00
      Total 0.24 0.28 0.48 1.00

      On the basis of the conditional distributions for both men and women are given in the above table, is there potential association between gender and opinion?

      A.
      B.

      Incorrect. The proportion of men who said “Yes” at 0.35 is much different than the proportion of women who said “Yes” at 0.16. Similarly, the proportion of men who said “No” at 0.17 is much different than the proportion of women who said “Yes” at 0.36. Thus, with so much difference between the two conditionals, we have to say that there is potential association.
      Correct. The proportion of men who said “Yes” at 0.35 is much different than the proportion of women who said “Yes” at 0.16. Similarly, the proportion of men who said “No” at 0.17 is much different than the proportion of women who said “Yes” at 0.36. Thus, with so much difference between the two conditionals, we have to say that there is potential association.
      Incorrect. Try again.
      2