In a study of the periodical cicada (Magicicada septendecim), researchers measured the hind tibia lengths (unit: um) of the shed skins of 85 individuals. Results for males and females are shown in the table below: Sample size Mean Standard deviation Group 1: Males 60 78.42 2.87 Group 2: Females 25 80.44 3.52 Suppose researchers want to test whether there is a significant difference in mean tibia lengths between the two gender groups. In conducting the test of significance (females - males) which of the following is the most appropriate test statistic and degrees of freedom (if applicable)? 0 A) t = 2.54; df= 24 O B) t = 2.54; df= 59 O C) 2 = 2.54; no df since n1 > 30 O D) t = 2.54; df = 25 Q E) t = 2.54; df = 60 A study was performed concerning risk factors for carotid-artery stenosis (arterial narrowing) among 264 men. The data reported for blood-glucose level (unit: mmol/L) are shown below: Sample size Mean Standard deviation Group 1: No 156 5.3 1.4 stenosis Group 2: Stenosis 108 5.1 0.8 OWhich of the following is a correct 95% confidence interval for the difference in means blood-glucose level between the two groups? Hint: Keep calculations to 4 decimals places! 0 A) (-0.007, 0.667) O B) (-0.0024, 0.0424) 0 C) (0.4503, 0.5497) 0 D) (-0.051, 0.451) O E) (-0.067, 0.467)