Problem #1: (a) The following data shows the number of hours that 8 hospital patients slept following the administration of a certain anesthetic.
7, 6, 11, 12, 4, 12, 9, 4,
Find a 95% confidence interval for the average hours slept following the administration of the anesthetic for the sampled population.
(b) Which of the following statements is true regarding part (a)?
confidence interval
enter your answer in the form a,b
(numbers correct to 2 decimals)
(A) The population must be normal. (B) The population standard deviation σ must be known.
(C) The population must follow a t-distribution. (D) The population mean must be inside the confidence interval.
(E) The population does not need to be normal.