Identify a one-sample t-interval or matched-pairs t-interval and state the population mean or mean difference it estimates.
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.
| Scoring for Question 6 Each essentially correct (E) part counts as 1 point, and each partially correct (P) part counts as 21 point. | |
|---|---|
| Score | |
| Complete Response | 4 |
| Substantial Response | 3 |
| Developing Response | 2 |
| Minimal Response | 1 |
| If a response is between two scores (for example, 221 points), use a holistic approach to decide whether to score up or down, depending on the strength of the response and quality of the communication. | |
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.
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.