The null and alternative hypotheses are given. determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed. what parameter is being tested? upper h 0: sigma equals 125 upper h 1: sigma less than 125 is the hypothesis test left-tailed, right-tailed, or two-tailed? right-tailed test left-tailed test two-tailed test what parameter is being tested? population mean population proportion population standard deviation