In a certain region, 24% pf people over age 50 didnt graduate from high school. We would like to know of this percentage is the same among the 25-30 year age group
Added by Iker M.
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It's believed that as many as $21 \%$ of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within $10 \%$ with $90 \%$ confidence? b) Suppose we want to cut the margin of error to $4 \%$. What's the necessary sample size? c) What sample size would produce a margin of error of 5\%?
The following table represents the highest educational attainment of all adult residents in a certain town. If a resident who is aged 50 or over is chosen at random, what is the probability that they have only completed high school? Round your answer to the nearest thousandth. Age 20-29 Age 30-39 Age 40-49 Age 50 & over Total High school only 848 1332 358 1509 4047 Some college 642 772 864 1736 4014 Bachelor's degree 682 796 1105 1119 3702 Master's degree 774 457 639 811 2681 Total 2946 3357 2966 5175 14444
Donna D.
The following table represents the highest educational attainment of all adult residents in a certain town. If a resident who has completed just high school or only some college is chosen at random, what is the probability that they are aged 50 or over? Round your answer to the nearest thousandth. | | Age 20-29 | Age 30-39 | Age 40-49 | Age 50 & over | Total | |---|---|---|---|---|---| | High school only | 1355 | 427 | 402 | 1875 | 4059 | | Some college | 1673 | 1019 | 772 | 2404 | 5868 | | Bachelor's degree | 1173 | 1106 | 529 | 1054 | 3862 | | Master's degree | 840 | 695 | 208 | 1397 | 3140 | | Total | 5041 | 3247 | 1911 | 6730 | 16929 | Answer: 0.253
Marc L.
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