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Lab 2: Confidence Interval (Place of Birth)

Module by: Susan Dean, Barbara Illowsky, Ph.D.. E-mail the authors

Class Time:

Names:

Student Learning Outcomes:

  • The student will calculate the 90% confidence interval for proportion of students in this school that were born in this state.
  • The student will interpret confidence intervals.
  • The student will determine the effects that changing conditions have on the confidence interval.

Collect the Data

  1. 1. Survey the students in your class, asking them if they were born in this state. Let XX size 12{X} {} = the number that were born in this state.
    • a. nn size 12{n} {} =________________________
    • b. xx size 12{x} {} =________________________
  2. 2. Define the Random Variable P'P' size 12{P'} {} in words.
  3. 3. State the estimated distribution to use.

Find the Confidence Interval and Error Bound

  1. 1. Calculate the confidence interval and the error bound.
    • a. Confidence Interval:
    • b. Error Bound:
  2. 2. How much area is in both tails (combined)? αα=
  3. 3. How much area is in each tail? α 2 α 2 =
  4. 4. Fill in the blanks on the graph with the area in each section. Then, fill in the number line with the upper and lower limits of the confidence interval and the sample proportion.
    Figure 1
    Normal distribution curve with two vertical upward lines from the x-axis to the curve. The confidence interval is between these two lines. The residual areas are on either side.

Describe the Confidence Interval

  1. In two to three complete sentences, explain what a Confidence Interval means (in general), as if you were talking to someone who has not taken statistics.
  2. In one to two complete sentences, explain what this Confidence Interval means for this particular study.
  3. Using the above information, construct a confidence interval for each given confidence level given.
    Table 1
    Confidence level EBP / Error Bound Confidence Interval
    50%    
    80%    
    95%    
    99%    
  4. What happens to the EBP as the confidence level increases? Does the width of the confidence interval increase or decrease? Explain why this happens.

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