1) Which of the following is the best concluding sentence for a test of whether 31 of 35 deer had a fluffy tail indicates that fluffy tails are found on more than half of deer:

a) A significantly disproportionate number of deer observed had fluffy tails (Binomial test, n=35 P

b) An observed 31 of 35 deer, significantly greater than 50%, had fluffy tails (Binomial test, P

c) The probability of finding that 31 out of 35 deer have fluffy tails is P

d) The probability of finding that 31 or more deer out of 35 have fluffy tails, is P

2) You wish to use Microsoft Excel to conduct a Chi-squared test to determine whether the likelihood of having brown eyes is no different from the likelihood of having blue or green eyes, based on a random sample of 122 randomly selected people. Your test statistic is 34.19. Which is the correct formula to use in Excel:

a) =CHISQ.DIST.RT(34.19,3)

b) =CHISQ.DIST.RT(122, 34.19,3)

c) =CHISQ.DIST.RT(34.19,2)

d) =CHISQ.DIST.RT(122, 2)

3) Given the following contingency tables, highlighting the frequency with which experimentally chosen individuals who were given oxygen, or not, survived or died from a hypothetical disease. The two tables outline the observed frequencies, and the expected frequencies, which have been calculated for you.Please calculate the Chi-squared statistic (to two decimal places).

Observed frequencies Given Oxygen Not given Oxygen TOTAL Survived 1045 88 1133 Died 32 8 40 TOTAL 1077 96 1173 Expected Frequencies Given Oxygen Not given Oxygen TOTAL Survived 1040.3 92.7 1133 Died 36.7 3.3 40 TOTAL 1077 96