In a survey, 26 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $33 and standard deviation of $8. The best point estimate for μμ is . The margin of error for a 98% confidence interval is . 2. Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 12 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: Hours 3 2.2 2.2 2.9 2.9 2.1 2.2 3 2.4 2.8 2.9 2.6 What is a point estimate for the population mean length of time. (Round answer to 2 decimal places) Construct a 99% confidence interval for the population mean length of time. (Round the critical value to 3 decimal places. Round upper and lower bounds to 2 decimal places.) What must be true in order to construct a confidence interval in this situation? What does it mean to be "99% confident" in this problem?
In a survey, 26 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $33 and standard deviation of $8.
The best point estimate for μμ is .
The margin of error for a 98% confidence interval is .
2.
Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 12 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows:
| Hours |
|---|
| 3 |
| 2.2 |
| 2.2 |
| 2.9 |
| 2.9 |
| 2.1 |
| 2.2 |
| 3 |
| 2.4 |
| 2.8 |
| 2.9 |
| 2.6 |
What is a point estimate for the population mean length of time. (Round answer to 2 decimal places)
Construct a 99% confidence interval for the population mean length of time. (Round the critical value to 3 decimal places. Round upper and lower bounds to 2 decimal places.)
What must be true in order to construct a confidence interval in this situation?
What does it mean to be "99% confident" in this problem?
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