Finding Confidence Intervals with the Normal Distribution


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question 1 of 3

The quantity that we subtract or add to x-bar (x̄) to obtain a confidence interval for mu (μ) is known as which of the following?

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1. What is the term for the variability of individual observations around their mean?

2. A baker is trying to determine how to price one of their loaves of bread. They take a sample of 25 comparable loaves at other bakeries, and find that they have a mean price of $3.25. If the population standard deviation for loaves of bread in this city is $1, and the population is normally distributed, then what's a 90% confidence interval for the mean of the price of all similar loaves of bread in this city?

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About This Quiz & Worksheet

Confidence intervals and normal distribution are the subjects of this quiz. You can find questions asking about subtracting or adding to the x-bar as well as the variability of individual observations around their respective means.

Quiz & Worksheet Goals

You are asked about the following topics on this worksheet:

  • Individual observations and their variability
  • When the confidence interval is determined with nonparametric methods
  • The symbol for population mean
  • Small samples

Skills Practiced

  • Defining key concepts - be sure you know the symbol used for population mean
  • Information recall - remember what you have learned about sample sizes
  • Knowledge application - use what you know to answer questions about confidence intervals determined with nonparametric methods

Additional Learning

To find out more, go to the lesson titled Finding Confidence Intervals with the Normal Distribution. There, you can read up on the following subjects:

  • Population standard deviation
  • Different cases of confidence intervals
  • Examples of problems involving confidence intervals