Suppose you are a researcher in a hospital. You areexperimenting with a new tranquilizer. You collect data from arandom sample of 9 patients. The period of effectiveness of thetranquilizer for each patient (in hours) is as follows: 2 2.4 2.72.4 2.1 2.1 2.2 2.9 2.1

What is a point estimate for the population mean length of time.(Round answer to 4 decimal places)

Which distribution should you use for this problem? normaldistribution or t-distribution

What must be true in order to construct a confidence interval inthis situation?

The population standard deviation must be known

The population must be approximately normal

The population mean must be known

The sample size must be greater than 30

Construct a 90% confidence interval for the population meanlength of time. Enter your answer as an open-interval (i.e.,parentheses) Round upper and lower bounds to two decimal places

What does it mean to be \"90% confident\" in this problem?

There is a 90% chance that the confidence interval contains thepopulation mean

The confidence interval contains 90% of all samples 90% of allsimple random samples of size 9 from this population will result inconfidence intervals that contain the population mean

Suppose that the company releases a statement that the mean timefor all patients is 2 hours.

Is this possible? No Yes

Is it likely? Yes No