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164 165 NEXT TWO QUESTIONS ARE RELATED 166 Average weight of males in the age bracket of 20-39 is 198.5 pounds. Assume population 167 standard deviation of weight of this group of males is 16 pounds. 168 You obtain a random sample of 30 males in this age bracket. 169 14 What is the probability that the sample mean is less than 1957 170 a 0.1501 171 b 0.1154 172 C 0.0888 173 d 0.0683 174 175 15 In repeated samples of size n = 30 males from this population, the fraction of sample 176 means that fall within 194 and 203 is_ 177 a 0.7911 178 b 0.8327 179 C 0.8766 180 d 0.9227 181 182 NEXT THREE QUESTIONS ARE RELATED 183 According to CDC, among men aged 20-39 obesity is 40.5%-7 = 0.405. 184 You take repeated samples of size n = 650 from the population of men in this age group. 185 16 The fraction of proportion of men in these samples who are obese which fall between 186 0.37 and 0.44 is, 187 a 0.8236 188 0.8579 189 0.8937 190 d 0.9309 191 192 17 In the previous question, the margin of error for the middle interval which captures 193 95% of all p's from samples of size 650 is, 194 0.042 195 0.038 196 C 0.034 197 0 0.031 198 199 18 In the previous question, to obtain a sampling distribution of the proportion, where 95% 200 of the sample proportions fall within a margin of error of MOE = +0.03 (3 percentage 201 points) from n, the proper sample size is: 202 a 1029 203 1083 204 1140 205 1200 206 207 19 Consider the middle interval in the sampling distribution of p: 208 0.430 0.500 205 where p is obesity rate in the random samples of adult males in the age group 50-59. 210 Given a = 0.05, what is the sample size n in this sampling distribution? 211 895 212 836 213 781 214 730 215 216 20 In a state referendum the proportion of voters who favor the proposition to legalize marijuana is 217 JA = 0.52 218 A pollster polls a random sample ( n = 480 219 The probability that the poll will wrongly predict the defeat of the proposition is 220 0.1617 221 b 0.1902 222 0.2238 223 0.2639 224