An omithologist specializes in the study of the Eurelian Bobbled Cornemuse, a highly endangered species. In April 2014 he was able to collect a random sample of 15 of the adult birds to weigh. The average weight of the birds in the 2014 sample was 7.8 Kg, with a standard deviation of 2.9 Kg. This year he has not been so successful. Here are the weights of the random sample from April 2015: 4.5 Kg, 101 Kg, 6.7 Kg, 3.6 Kg, and 8.8 Kg. 8) b) d) Test whether the mean weight of the adult birds has significantly decreased over the yeah Give two 95% confidence intervals, one for the mean weight of adult Eurelian Bobbled Cornemuses in April 2015, and one for the difference in the mean weights between April 2014 and April 2015. How large a sample would be needed to form a 92% confidence interval for the overall mean weight of the adult birds in April 2015, if the desired margin of error is 20 g? In April 2014 6 of the birds sampled weighed more than 8 Kg. Can this information be used to form a 95% confidence interval for the overall proportion of adult Eurelian Bobbled Cornemuses that weighed more than 8 Kg in April 2014? Give the reason for your answer. A company that supplies vending machines has installed three supposedly identical machines on the campus of MacMillan University, one in the Arts Building, one in the library, and one in the Law Building. The machine dispenses bubbly drinks for $1.60. A suspicious statistics student selects independent random samples of containers of the drinks from the three machines, and has recorded the contents in milliliters. Test whether there is any signicant difference in the mean servings at the three R'f'h