StatTutor Lesson - Robustness of t Procedures

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Robustness of t procedures
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      Question 1

      33

      Question 1.

      Which theoretical condition is most important?

      		A.
      		B.
      Incorrect. Data collection is the most important condition.
      Correct. Data collection is the most important condition.
      Incorrect. Try again.
      2

      Question 2

      84

      Question 2.

      True or false: Conclusions from inferential procedures are valid regardless of how the data were collected.

      		A.
      		B.
      Incorrect. Data must be properly collected for conclusions to be valid.
      Correct. Data must be properly collected for conclusions to be valid.
      Incorrect. Try again.
      2

      Question 3

      204

      Question 3.

      True or false: We don’t worry about Normality of the population distribution provided a plot of the sample data displays no outliers or strong skewness or sample size is large.

      		A.
      		B.
      Incorrect. t procedures give valid results even when the condition of Normality of the population distribution is not met provided the data are not strongly skewed and don’t include any outliers.
      Correct. t procedures give valid results even when the condition of Normality of the population distribution is not met provided the data are not strongly skewed and don’t include any outliers.
      Incorrect. Try again.
      2

      Question 4

      280

      Question 4.

      For these data is the Normality condition met? Why or why not?

      		A.
      		B.
      		C.
      Incorrect. The sample size of 143 is large enough to apply the Central Limit Theorem.
      Correct. The sample size of 143 is large enough to apply the Central Limit Theorem.
      Incorrect. Try again.
      2

      Question 5

      338

      Question 5.

      For these data is the Normality condition met? Why or why not?

      		A.
      		B.
      		C.
      Incorrect. The sample size is 16 (less than 40) and there are no outliers visible in the plot of the data.
      Correct. The sample size is 16 (less than 40) and there are no outliers visible in the plot of the data.
      Incorrect. Try again.
      2

      Question 6

      392

      Question 6.

      For these data is the Normality condition met? Why or why not?

      		A.
      		B.
      		C.
      Incorrect. The sample size is small (less than 40) and there is a clear outlier in the plot of the data, so the Normality condition is not met.
      Correct. The sample size is small (less than 40) and there is a clear outlier in the plot of the data, so the Normality condition is not met.
      Incorrect. Try again.
      2