What sample size should they use

Reference no: EM131396744

Investigators are studying two drugs used to improve the FEVl readings (a measure of lung function) in asthmatic patients.

Assume that σ = .8 and the difference in means they wish to detect is .25. If they want to do a two-sided test of equal population means with a = .05 and β = .20, what sample size should they use?

Reference no: EM131396744

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