Confidence Intervals

Estimate the proportion of orange balls in the large jar.

Instructions :
Choose samples and create confidence intervals to estimate the proportion of orange balls in the large jar. Top

Options Menu : Use the 'Options' menu to change the animation speed or confidence bar thickness. This menu can also be used to choose to estimate the percentage of orange balls in the population rather than the proportion.

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Questions to Consider:
  1. As the confidence level increases, do the intervals generally get wider or more narrow? Explain.
  2. As the sample size increases, do the intervals generally get wider or more narrow? Explain.
  3. When 100 confidence intervals are generated, why are they all different?
  4. If the confidence level selected is 90%, about how many of 100 intervals will cover the true percentage of orange balls? Will exactly this number of intervals cover the true percentage each time 100 intervals are created? Explain.
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