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Previous question Question 3 (of 4) You have answered 0 of 30 parts Next question > Jump to question: 1 Seasonal factors such as the incidence of infectious agents during gestation may affect handedness. The work of Martin and Jones (1999, Cortex 35:123-128) suggests that there may be a different incidence of left- handedness for people born between February and August than those born between September and January (for the southern hemisphere). Data collected from statistics students is summarized below (LH = left- handed, RH = right-handed): Total Born LH Feb-Aug 31 Sep-Jan 42 Total 73 RH 225 175 256 217 473 400 a) What are the odds of being left-handed for people born in Feb-Aug? 3DP b) What are the odds of being left-handed for people born in Sep-Jan? 1 1 1 111 3DP c) What is the odds ratio of being left-handed for people born in Feb-Aug relative to those born in Sep-Jan? 3DP d) What is the standard error of the logarithm of the odds ratio i.e. Sin(OR)? 1 3DP e) Calculate the lower and upper limits of the 95% confidence interval for the logarithm of the odds ratio. (1) The lower limit is: 3DP 11 (ii) The upper limit is: 2 3DP f) By taking the exponential of these limits, give the lower and upper limits of the 95% confidence interval for the odds ratio. (i) The lower limit is: 3DP 11 (ii) The upper limit is: 1 3DP At the a = 0.05 level of significance, is there evidence of a difference in the odds of left-handedness amongst statistics students born between February and August compared with those born between September and January (in the southern hemisphere)?

At the a = 0.05 level of significance, is there evidence of a difference in the odds of left-handedness amongst statistics students born between February and August compared with those born between September and January (in the southern hemisphere)? O We are 95% confident that the true odds ratio lies between the limits calculated above. As 1 is included in the interval there is no evidence of a difference in the odds of left-handedness between the two groups. O We are 95% confident that the true odds ratio lies between the limits calculated above. As 1 is excluded from the interval there is evidence of a difference in the odds of left-handedness between the two groups. As the interval is entirely above 1 there is evidence that the odds of being left-handed for those born in Feb-Aug is higher than for those born Sep-Jan. O We are 95% confident that the true odds ratio lies between the limits calculated above. As zero is excluded from the interval there is evidence of a difference in the odds of left- handedness between the two groups. As the interval is entirely above zero there is evidence that the odds of being left-handed for those born in Feb-Aug is higher than for those born Sep-Jan. O We are 95% confident that the true odds ratio lies between the limits calculated above. As 1 is excluded from the interval there is evidence of a difference in the odds of left-handedness between the two groups. As the interval is entirely below 1 there is evidence that the odds of being left-handed for those born in Feb-Aug is lower than for those born Sep-Jan. O We are 95% confident that the true odds ratio lies between the limits calculated above. As zero is excluded from the interval there is evidence of a difference in the odds of left- handedness between the two groups. As the interval is entirely above zero there is evidence that the odds of being left-handed for those born in Feb-Aug is lower than for those born Sep-Jan. < Previous question Question 3 (of 4) You have answered 0 of 30 parts Next question > Jump to question: 1 4