Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 11 patients.

Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 11 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows:

2.9

3.3

2.5

2.9

3

2.4

2

2.5

2.4

2.5

• The population standard deviation must be known
• The population mean must be known
• The sample size must be greater than 30
• The population must be approximately normal

open-intervali.e.

• The confidence interval contains 95% of all samples
• 95% of all simple random samples of size 11 from this population will result in confidence intervals that contain the population mean
• There is a 95% chance that the confidence interval contains the population mean

• No
• Yes