PEF is a measure of patient's abiltity to expel air from lungs. PEF for children free of asthma is 306. investigator wants to know whether children with chronic bronchitis have restricted PEF. sample of 40 children with chronic bronchitis are studied, their mean PEF is 279, standard deviation 71. Is there stastical evidence of lower mean PEF in children with chronic bronchities? Run appropriate test at alpha = 0.05

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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.