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Confidence interval for the mean number

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Reference no: EM13929188

Scenario

Another sample of candies was opened and recorded. The sample size was 20. Below is the summary of the sample.

Color

Red

Blue

Green

Yellow

Orange

Total

Mean

3.65

2.25

2.75

3.45

2.4

14.5

Standard Deviation

2.23

1.97

1.77

2.01

2.14

3.56

Using that information, construct the following:

  • A 90% confidence interval for the mean number of red candies.
  • A 95% confidence interval for the mean number of blue candies.
  • A 99% confidence interval for the variance of orange candies
  • A 90% confidence interval for the standard deviation of the total number of candies.

Hint: The Excel functions confidence.norm() and confidence.T() can be used to find the margin of error E quite easily. Also, you might want to use the following calculators in Statcrunch:

  • Stat- > Z Statistics -> One Sample
  • Stat -> T Statistics -> One Sample
  • Stat -> Proportion Statistics -> One Sample
  • Stat -> Variance Statistics -> One Sample

Reference no: EM13929188

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