1) Through random sampling, you find that 12/15 female rattlesnakes have a diamond pattern and 11/20 male rattlesnakes have a diamond pattern. What is your best estimate for the proportion of all rattlesnakes that have a diamond pattern?

a) 12+11/15+20

b) (12-11)/(20-15)

c) 12/15+11/20

d) (12+11)/(15+20)

2) The P-value in a Chi-squared test is calculated as:

a) The area under the curve of the null distribution to the right of the chi-square test statistic

b) The area under the curve of the null distribution to the left of the chi-square test statistic

c) The area under the curve defined by the null distribution

d) The area under the curve of the null distribution to the right of the degrees of freedom for the test

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. All but one expected frequency has been calculated for you. Calculate the remaining expected frequency for those who survived who were not given oxygen (to one decimal place)

n, 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 19 20 1 NI 1 4 5 6 6 8 HANOI CO Un WO . - SOGANG. 6 7 8 9 10 11 11 12 13 13 9 11 12 13 14 15 17 18 19 20 10 13 16 17 19 21 22 24 25 27 SOONOUWNOI 10 12 14 16 18 20 22 24 26 28 30 32 34 10 13 15 17 19 22 24 26 29 31 34 36 38 41 12 15 17 21 23 26 28 31 34 37 39 42 45 48 SOONOUAAWN-OI 11 14 17 20 23 26 29 33 36 39 42 45 48 52 55 11 13 16 19 23 26 30 33 37 40 44 47 51 55 58 62 12 14 18 22 26 29 33 37 41 45 49 53 57 61 65 69 ONNOOGOALGONNA-O 13 12 16 20 24 28 33 37 41 45 50 54 59 63 67 72 76 14 13 17 22 26 31 36 40 45 50 55 59 64 67 74 78 83 15 14 19 24 29 34 39 44 49 54 59 64 70 75 80 85 90 16 11 15 21 26 31 37 42 47 53 59 64 70 75 81 86 92 98 17 11 17 22 28 34 39 45 51 57 63 67 75 81 87 93 99 105 18 12 18 24 30 36 42 48 55 61 67 74 80 86 93 99 106 112 NNNN 19 13 19 25 32 38 45 52 58 65 72 78 85 92 99 106 113 119 20 14 20 27 34 41 48 55 62 69 76 83 90 98 105 112 119 127