The average 1-year-old girl is 25 inches tall. A random sample of 40 one-year-old-girls in a large day care franchise had an average height of 25.5 inches. At a=0.05, can it be concluded that the...

The average 1-year-old girl is 25 inches tall. A random sample of 40 one-year-old-girls in a large day care franchise had an average height of 25.5 inches. At a=0.05, can it be concluded that the average height differs from 25 inches? Assume ?=1.96.

The alternative hypothesis?

Critical Value?