Consider a Situation in Which Rosa Measures the Diameter of 15

Multiple Choice

Consider a situation in which Rosa measures the diameter of 15 trees from a population that she thinks (based on published reports) has an average diameter of 240 cm. Her sample has a mean of 253.1 cm with a standard deviation of 25.21 cm. Based on her t-test statistic, which of the following best describes her conclusion?

A) She fails to reject the null hypothesis of the t-test and concludes that the mean diameter of the trees seems to differ from 240 cm.
B) She fails to reject the null hypothesis of the t-test and concludes that the mean diameter of the trees doesn't seem to differ from 240 cm.
C) She rejects the null hypothesis of the t-test and concludes that the mean diameter of the trees seems to differ from 240 cm.
D) She rejects the null hypothesis of the t-test and concludes that the mean diameter of the trees doesn't seem to differ from 240 cm.