Support ? Question Completion Status: QUESTION 1 1) A sample of the number of minutes spent on Facebook per week of college students is collected. Some of the sample results of this survey are given in the table below MINUTES ON FACEBOOK 35 60 135 160 185 260 285 Z-SCORE -2.5 -2.0 -0.5 0 .5 2 2.5 %ILE RANK 10 25 35 40 50 75 95 By observation of the table, determine the mean O a. 185 O b. 160 O c. none of the choices O d. 260 QUESTION 2 2) Referring to question 1) by observation of the table determine the standard deviation O a. 50 O b. 93.54 O c. none of the choices O d. 100 QUESTION 3 3) A sociologist is interested in estimating the educational level of a community. She randomly interviews 25 adult residents of the community and determines the number of years they attended school. Her sample had a mean of 12.5 years with a population standard deviation Of 3.8 years. Use a 95% confidence interval to estimate the educational level of the adults living in the community (2 decimal places) O a. 11.01 to 13.99 O b. none of the choices O c. 10.93 to 14.07 O d. 14.30 to 16.50 QUESTION 4 4) Referring to question 3, determine the margin of error. (2 decimal places) O a. +1.49 O b. nnone of the choices O c. + .76 O d. + 1.96