Question

Questions 4-7 relate to the paragraph below. Dr. Lee studies evolution in birds. He wants to test whether a finch-like bird on Island X in the Galapagos archipelago is a different species from the finches found on the other islands in the archipelago. Beak length is used to distinguish finches from other species of birds in the Galapagos archipelago. The mean beak length of the population of finches in the Galapagos is 2 cm; the variance of beak length in the population of finches is 1 cm. Experimenter Jones collects data on beak length from 20 of the finch-like birds on Island X. Their mean beak length is 3 cm. Suppose that Dr. Lee uses a 2-tailed statistical test. Assume that any assumptions needed to perform the statistical test called for have been met, which includes a normal distribution in the population of the scores of interest.

Answer 1

6)since level of significance has not been given , we assume it to be 0.05

critical value= -/+ 1.96

5)null hypothesis is:

The finch-like birds on Island X are finches.

Cannot be determined from the information given.

The finch-like birds on Island X are finches.