# Finding Confidence Intervals with the Normal Distribution

Instructions:

question 1 of 3

### The quantity we subtract or add to x-bar (x̄) to obtain a confidence interval for mu (μ) is known as the:

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### 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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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

• 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