Problem #7: (a) The following data shows the number of hours that 9 hospital patients slept following the administration of a certain anesthetic. 4, 4, 10, 9, 7, 10, 9, 9, 7 Find a 90% 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)? Problem #7(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 mean must be inside the confidence interval. (C) The population must follow a t-distribution. (D) The population standard deviation ?? must be known. (E) The population does not need to be normal.
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\[ \bar{x} = \frac{4 + 4 + 10 + 9 + 7 + 10 + 9 + 9 + 7}{9} = \frac{69}{9} = 7.67 \] Show moreā¦
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