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

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