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A In a study using data from the Danish Twin Registry, it is claimed that twins (specifically male twins) live longer than singletons. You decide to run a test to see if this is true in the United States. time left... You randomly sample the death records in New York City of 50 males who were born with a twin and 100 males who were born as a single birth. 0 :18:23 (a) If the mean life expectancy for all 150 males was 78.4 years with a population standard deviation of o = 4.3 years, calculate a 95% confidence interval for the mean life expectancy (in years) of all males. (Use a t or technology. Round your answers to two decimal places.) yr (b) What would be the appropriate null and alternative hypotheses? OHO: HT - HS = 0 Ha : HT - HS > O OHO: HT - HS = 0 Ha: HT - US $ 0 OHO: HT - HS = 0 Ha: HT - HS 0 Ha: HT - HS = 0 (c) If after conducting the test you found a t score of 1.58 and a P-value of 0.060, what would be the appropriate conclusion if you were using a significance level of 0.05? O Because 0.060 > a, we reject the null hypothesis. Because the 0.060 a, we fail to reject the null hypothesis. O Because the 0.060