StatTutor Lesson - Introduction to Tests of Significance: The Basics

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StatTutor: Introduction to Tests of Significance - The Basics
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      Question 1

      74

      Question 1.

      Fill in the blank: A test of significance tests a claim about a _______________.

      		A.
      		B.
      		C.
      		D.
      Incorrect. We test claims about the value of the parameter in a test of significance
      Correct. We test claims about the value of the parameter in a test of significance
      Incorrect. Try again.
      2

      Questions 2-3

      139

      Question 2.

      When is an observed effect statistically significant?

      		A.
      		B.
      		C.
      Incorrect. If the difference between the observed value of the statistic and the claimed value of the parameter is much larger than it should be due to chance, then we declare the difference to be statistically significant.
      Correct. If the difference between the observed value of the statistic and the claimed value of the parameter is much larger than it should be due to chance, then we declare the difference to be statistically significant.
      Incorrect. Try again.
      2

      Question 4

      289

      Question 4.

      True or false: The promotion rate for Hispanics was about the same as the promotion rate for all FBI agents.

      		A.
      		B.
      Incorrect. The judge declared the observed effect to be "statistically significant," meaning that the promotion rate for Hispanics was significantly lower than the overall FBI promotion rate.
      Correct. The judge declared the observed effect to be "statistically significant," meaning that the promotion rate for Hispanics was significantly lower than the overall FBI promotion rate.
      Incorrect. Try again.
      2

      Question 5

      365

      Question 5.

      Are the chances of an all male jury high or low given that 50% of the population is male?

      		A.
      		B.
      Incorrect. The probability is 0.0002 which is very low.
      Correct. The probability is 0.0002 which is very low.
      Incorrect. Try again.
      2

      Question 6

      383

      Question 6.

      Fill in the blank: An observed effect that would ________ happen if a claim about a parameter value were true is good evidence that the claim is not true.

      		A.
      		B.
      Incorrect. An observed effect that would rarely happen if a claim were true is good evidence that the claim is not true.
      Correct. An observed effect that would rarely happen if a claim were true is good evidence that the claim is not true.
      Incorrect. Try again.
      2