(Solved): Q13. A sample of 148 college students reports sleeping an average of 6.85 hours on weeknights, with ...

Q13. A sample of 148 college students reports sleeping an average of 6.85 hours on weeknights, with a standard error of 0.175 hours for a $95\%$ confidence level. 1) Which choice leads to a $95\%$ confidence interval estimate of the average sleep amount all college students get on weeknights using the $95\%$ rule? (A) $6.85\pm 2\cdot 0.175$ (B) $6.85\pm 2\cdot 0.0875$ (C) $6.85\pm 1.96\cdot 148$ (D) $0.175\pm 1.96\cdot 6.85$ 2) Which choice leads to a $95\%$ confidence interval estimate of the average sleep amount all college students get on weeknights using a value from an appropriate t-distribution? (A) $6.85\pm 2\cdot 0.175$ (B) $6.85\pm 2\cdot 0.0875$ (C) $6.85\pm 1.976\cdot 0.175$ (D) $6.85\pm 1.976\cdot 0.0875$ 3) Is 7.1 hours a plausible value for the average sleep amount all college students get on weeknights, based on the use of the $t$-distribution method from above? (A) Yes, 7.1 hours is plausible. (B) No, 7.1 hours is not plausible.