Optionalalternative"two.sided" (default), "less" or "greater"; unambiguous abbreviations are accepted.
OptionaldEffect size d (difference of means over the known standard deviation), or "small", "medium", "large".
OptionalnNumber of observations.
OptionalpowerPower of the test.
OptionalsigSignificance level. Default 0.05.
Options for pwrNormTest. The quantity given as
null(or omitted, exceptsigLevel) is solved for.