AP Statistics 4.2: Choosing a Mean CI
Identify a one-sample t-interval or matched-pairs t-interval and state the population mean or mean difference it estimates.
- Syllabus
- Effective Fall 2025
- Course
- AP Statistics
4.2.B—Identify an appropriate confidence interval procedure including the parameter for a population mean or… question 1
[Maximum number: 4]
A company sells a certain type of whistle. The price of the whistle varies from store to store. Julio, a statistician at the company, wants to estimate the mean price, in dollars ($), of this type of whistle at all stores that sell the whistle.
Question (a)
(a)
(i) Identify the appropriate inference procedure for Julio to use.
Model Solution
Use a one-sample t-interval for a population mean.
Scoring components
1. Identifies a one-sample t-interval for a population mean.
Question (b)
(b)
Describe the parameter for the inference procedure you identified in part (a-i) in context.
Model Solution
The parameter of interest is the mean price, in dollars, of this type of whistle at all stores that sell the whistle.
Scoring components
2. Identifies the population mean.
3. Includes the population and the whistle price in context.
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