Mathematics, 21.04.2020 22:25 catherine51

The world's smallest mammal is the bumblebee bat. The mean weight of 40 randomly selected bumblebee bats is 1.659 grams, with a standard deviation of 0.264 grams.

Dr. Clifford Jones claims that the mean weight of bumblebee bats is 1.7 grams. We are interested in whether it's less than he claims. Using the t-distribution technique, is there evidence that bumblebee bats weight less on average than he claims, at each of the following levels?

The degrees of freedom are df =

The test-statistic t = (positive version of t, three places after decimal) =

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The world's smallest mammal is the bumblebee bat. The mean weight of 40 randomly selected bumblebee...