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An analyst at an electronics company uses a sample size for estimation calculation before conducting a study to estimate the mean voltage of a new line of resistors used in circuit boards. The analyst wants to know what sample size is required to obtain a margin of error of 5. Based on previous studies, the standard deviation is 22.5.
To achieve a margin of error of 5 when estimating the mean voltage of resistors, the analyst needs to collect a sample size of 81.
| Parameter | Mean |
|---|---|
| Distribution | Normal |
| Standard deviation | 22.5 (estimate) |
| Confidence level | 95% |
| Confidence interval | Two-sided |
| Margin of Error | Sample Size |
|---|---|
| 5 | 81 |
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