What is the test statistic for this significance test? O t= -2.89
O z= -2.89
The distribution of the heights of five-year-old children
has a mean of 42.5 inches. A pediatrician believes the
five-year-old children in a city are taller on average.
The pediatrician selects a random sample of 40 five-
year-old children and measures their heights. The
mean height of the sample is 44.1 inches with a
standard deviation of 3.5 inches. Do the data provide
convincing evidence at the a =0.01 level that the
mean height of five-year-old children in this city is
greater than 42.5 inches?
O r=2.89
O z = 2.89