During a particular week, 6 babies were born in a maternity ward. Part of the standard procedure is to

measure the length of the baby. The data set below shows the lengths of the babies, in centimeters, born in

this particular week.

49 50 45 51 47 49

Test at 5% significance level, the null hypothesis against the alternative that the true mean of the length of

the babies is below 48 centimeters.