StatTutor Lesson - Finding Normal Proportions

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Finding normal proportions
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      Question 1

      36

      Question 1.

      Which of the following is a way to find areas other than 68-95-99.7 for a Normal distribution?

      A.
      B.
      C.
      D.
      E.
      F.

      Incorrect. We use either the Standard Normal table or statistical software to find areas for a Normal distribution.
      Correct. We use either the Standard Normal table or statistical software to find areas for a Normal distribution.
      Incorrect. Try again.
      2

      Questions 2-3

      100

      Question 2.

      What area is given by a cumulative proportion?

      A.
      B.
      C.

      Incorrect. A cumulative proportion is the area to the left.
      Correct. A cumulative proportion is the area to the left.
      Incorrect. Try again.
      2

      Question 4

      185

      Question 4.

      How do you find area to the right of a z-score using a cumulative proportion?

      A.
      B.
      C.

      Incorrect. A cumulative proportion gives area on the left. To find area on the right, we subtract the cumulative area from 1.0.
      Correct. A cumulative proportion gives area on the left. To find area on the right, we subtract the cumulative area from 1.0.
      Incorrect. Try again.
      2

      Question 5

      278

      Question 5.

      What is the first step in finding an area under a Normal distribution for an x-value using the Standard Normal table?

      A.
      B.
      C.

      Incorrect. Since the Standard Normal table gives cumulative areas for z-scores, we must first find the z-score corresponding to the x-value.
      Correct. Since the Standard Normal table gives cumulative areas for z-scores, we must first find the z-score corresponding to the x-value.
      Incorrect. Try again.
      2