Selected Problems and Solutions For Midterm Soc2205 Midterm Review Selected Problems and Solutions For Midterm

Problem: Healey 1st #2.2 a-e, 2nd #2.2 a-e Tips: Read questions carefully. Answer exactly what is asked. Round answers to 2 decimal places.

Solutions to #2.2 a - e a. 42.36% b. 0.47 c. 1.41 d. 52.84% e. 1.12 males for each female

Problems: Healey 1st Can. #3.11, 4.9, and 2nd Can. #3.11 For both texts, compute the mean, the median, the range and the standard deviation for number of cars per 100 population

Solutions to 1st Can. #3.11 and 4.9, 2nd Can. #3.11 Mean = 40.25 Median = 44.5 Range = 51 – 10 = 41 Standard deviation = 12.29 Note: Md>Mean indicates a negative skew

Problem: Healey 1st #5.4 a-e, 2nd #4.4 a-e Problem Information: = 50 s = 10 Question asks: What % of area….

Example Detailed Solution 5.4a (4.4a) For Xi = 40, For Xi = 47, Areas between scores and mean: For Z = -1.00, Area = .3413 For Z = -0.30, area = .1179 Area between scores: (.3413) - (.1179) = .2234

Solution #5.4 (#4.4) a - e a. Percentage = .2234 x 100 = 22.34% b. 61.79% c. 61.79% d. 86.64% e. 1.39%

Problem: Healey 1st #7.5a, 2nd #6.5a Problem Information:  = .10, Z =  1.65 = 2.3 s = .35 N = 178

Solution to 7.5a (6.5a) (see next page for final answer)

Solution to 7.5a (6.5a) cont. CI = 2.30 ± .04 Expand this to: “I am 90% confident that the population average is between 2.26 and 2.34 people per household”

Problem: Healey 1st #7.9, 2nd #6.9 Problem Information:  = .05, Z =  1.96 Ps = (25/178) = . 14 N = 178

Solution to 1st #7.9, 2nd #6.9