Question

39, please

So is the study inconclusive? The class decides that the sample size was too small and believe many more joss should be sampled Well Christine can't do this all by herself finding all these ioeys and weighing them is exhausting work) so she and 22 of her classmates all go to Australia and each of them finds and weighs 23 joeys (think about that -what is the sample size going to be?). They compile all their data and determine the combined average weight to be 50409 mg with the sample s.d still equal to 40 mg They perform an hpothesis test using a.OL 39. What test do they use and why? a) t-test because it's a sample s.d. c) z-test because it's a large enough sample d) z-test because it's a sample s.d. e) none of these b) t-test because the sample is small 40, The test is not significant at α-01. However, using the p-value, how confident are we of the test result? a) 95.24% b) 96.88% c) 98.12% d) 99.06% e) none ofthese

Answer 1

Solution: 39. What test do they use and why?

Answer: c) z-test because it's a large enough sample.

Explanation: We are given the sample mean and sample standard deviation. Although the population standard deviation is not known yet we have a large sample size $n=23 \times 23=529$ to use the z-test.