The average systolic blood pressure of a population of young men is population mean=112.5 mm,  population standard deviation= 16.4 mm. Prehypertension is defined as having a systolic pressure between 120 and 139.  calculate the z-score for a systolic pressure of 120

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.