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StatTutor Lesson - Residual Lines

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      Question 1

      32

      Question 1.

      If the “YES” answer to a question gives the alternative hypothesis, what is the alternative hypothesis for the following question? “Is student smoking associated with parent’s smoking?”

      A.
      B.

      Correct. A “YES” answer says: There is association between student smoking and parent’s smoking.
      Incorrect. A “YES” answer says: There is association between student smoking and parent’s smoking.
      2
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      Question 2

      79

      Question 2.

      True or false: The null hypothesis for a chi-square test is always a statement of no relationship.

      A.
      B.

      Correct. This is a correct statement.
      Incorrect. This is a correct statement.
      2
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      Question 3

      96

      Question 3.

      True or false: The red numbers in the table are called “observed counts."

      A.
      B.

      Correct. The red numbers are the counts “observed” in the data.
      Incorrect. The red numbers are the counts “observed” in the data.
      2
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      Question 4

      125

      Question 4.

      True or false: The expected counts are the counts we “expect” to observe if the alternative hypothesis were true.

      A.
      B.

      Correct. The expected counts are the counts we “expect” to observe if the null hypothesis of no association were true.
      Incorrect. The expected counts are the counts we “expect” to observe if the null hypothesis of no association were true.
      2
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      Question 5

      142

      Question 5.

      If there were no association between student smoking and parent’s smoking, what proportion of students smoke?

      A.
      B.
      C.

      Correct. Regardless of parent’s smoking, overall 10045375 = 0.187 or 18.7% of students smoke.
      Incorrect. Regardless of parent’s smoking, overall 10045375 = 0.187 or 18.7% of students smoke.
      2
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      Question 6

      181

      Question 6.

      If student smoking is not associated with parent’s smoking, how many of the 2239 students who have one parent smoking do we expect to smoke? Recall that 18.68% of students smoke. You may need a calculator to answer this.

      A.
      B.
      C.
      D.
      E.

      Correct. (0.1868)(2239) = 418.2
      Incorrect. (0.1868)(2239) = 418.2
      2
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      Question 7

      254

      Question 7.

      If there is no relationship, how many students do we “expect” to smoke when neither parent smokes?

      A.
      B.
      C.

      Correct. (1356)(1004)5375 = 353.3
      Incorrect. (1356)(1004)5375 = 353.3
      2
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      Question 8

      314

      Question 8.

      True or false: The row totals for the expected counts are the same as the row totals for the observed counts.

      A.
      B.

      Correct. This is a correct statement.
      Incorrect. This is a correct statement.
      2