(a) State the null and alternative hypotheses and (b) state whether the test of hypothesis will be a two-tailed test, a right-tailed test, or a left-tailed test.
The weights of newborn baby girls born at a local hospital are normally distributed. A hospital administrator speculates that the mean weight of newborn baby girls born at the hospital is greater than 90 ounces. A random sample of size n = 20 had a mean weight of 95 ounces and a standard deviation of 8 ounces. Do these data indicate that the mean weight of all newborn baby girls born at the local hospital is greater than 90 ounces?