Research on brain specimens. Refer to the Brain and Language

Research on brain specimens. Refer to the Brain and Language

Research on brain specimens. Refer to the Brain and Language data on postmortem intervals (PMIs) of 22 human brain specimens, presented in Exercise 2.39 (p. 48). The data are saved in the BRAINPMI file. The mean and standard deviation of the PMI values are 7.3 and 3.18, respectively.
a. Find the z -score for the PMI value of 3.3.
b. Is the PMI value of 3.3 considered an outlier? Explain.
Exercise 2.39
Research on brain specimens. The postmortem interval (PMI) is defined as the time elapsed (in days) between death and an autopsy. Knowledge of the PMI is considered essential to conducting medical research on human cadavers. The data in the accompanying table are the PMIs of 22 human brain specimens obtained at autopsy in a recent study (Brain and Language, June 1995). Describe the PMI data graphically with a dot plot. On the basis of the plot, make a summary statement about the PMIs of the 22 human brain specimens. (The data are saved in the BRAINPMI file.)

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