Construct a 95 confidence interval for the true mean pmi of, Basic Statistics

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Construct a 95 confidence interval for the true mean pmi of

Data on postmortem intervals. In given Exercise you learned that postmortem interval (PMI) is the elapsed time between death and the performance of an autopsy on the cadaver. Brain and Language (June 1995) reported on the PMIs of 22 randomly selected human brain specimens obtained at autopsy. The data are reproduced in the table below.

2184_Tab 7.jpg

(a) Construct a 95% confidence interval for the true mean PMI of human brain specimens obtained at autopsy.

(b) Interpret the interval, part a.

(c) What assumption is required for the interval, part a, to be valid? Is this assumption satisfied? Explain.

(d) What is meant by the phrase ‘‘95% confidence''?

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