Research suggests that identical twins have many similarities, such as body weights, even as adults. A sample of ten sets of identical twins were weighed and had their weights recorded in kilograms. The researcher wishes to test whether there is a statistically significant difference in adult weight between first born and second born identical twins.

Given the design of the study and the question of interest, which of the following 4 computer outputs is relevent to use?

A. Paired T-Test and Cl

Sample N Mean StDev SE Mean

First-Born 10 77.59 23.38 7.39
Second-Born 10 78.02 17.36 5.49
Difference 10 -0.43 11.83 3.74

95% upper bound for mean difference: 6.43

T-Test of mean difference = 0 (vs < 0): T-value = -0.12 P-value = 0.455

B. Two-Sample T-Test and Cl

Sample N Mean StDev SE Mean

First-Born 10 77.6 23.4 7.4
Second-Born 10 78.0 17.4 5.5
Difference = mu (First=Born) - mu (Second-Born)

Estimate for difference: -0.43

95% upper bound for difference: 15.64

T-Test of difference: 0 (vs <): T-value = -0.05 P-value = 0.482 DF = 16

C. Paired T-Test and Cl

Sample N Mean StDev SE Mean

First-Born 10 77.59 23.38 7.39
Second-Born 10 78.02 17.36 5.49
Difference 10 -0.43 11.83 3.74

95% Ci for mean difference: (-8.89, 8.03)

T-Test of mean difference = 0 (vs not = 0): T-value = -0.12 P-value = 0.911

D. Two-Sample T-Test and Cl

Sample N Mean StDev SE Mean

First-Born 10 77.6 23.4 7.4
Second-Born 10 78.0 17.4 5.5
Difference = mu (First=Born) - mu (Second-Born)

Estimate for difference: -0.43

95% CI for difference: (-19.95, 19.09)

T-Test of difference: 0 (vs not =): T-value = -0.05 P-value = 0.963 DF = 16

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

In january 2010, you began a one-year study of tuberculosis (tb) in a subsidized housing community in the lower east side of new york city. you enrolled 500 residents in your study and checked on their tb status on a monthly basis. at the start of your study on january 1st, you screened all 500 residents. upon screening, you found that 30 of the healthy residents had been vaccinated for tb and therefore were not at risk. another 20 residents already had existing cases of tb on january 1st. on february 1st, 5 residents developed tb. on april 1st, 10 more residents developed tb. on june 1st, 10 healthy residents moved away from new york city and were lost to follow-up. on july 1st, 10 of the residents who had existing tb on january 1st died from their disease. the study ended on december 31, 2010. assume that once a person gets tb, they have it for the duration of the study, and assume that all remaining residents stayed healthy and were not lost to follow-up. is the subsidized housing community in the lower east side of new york city a dynamic or fixed population? briefly explain the rationale for your answer. dynamic population it can changeable people can move out and move in into the population of a subsidized housing what was the prevalence of tb in the screened community on january 1st? prevalence = 30/500 0.06= 6% what was the prevalence of tb on june 30th? prevalence= 40/450=0.08= 8.88% what was the cumulative incidence of tb over the year? cumulative incidence = number of new cases/number in candidate population)over specified time period 10/450 = 2.2% suppose that you wanted to calculate the incidence rate of tb in the study population. calculate the amount of person-time that would go in the denominator of this incidence rate. be sure to show your work.

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.