Mathematics, 16.03.2020 23:48 dsdlskds3880
Graduation. It's believed that as many as 25% of adults over 50 never graduated from high school. We wish to see 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 6% 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 3%?
Answers: 3
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What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?
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Mathematics, 21.06.2019 19:40
Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.
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Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?
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Joey is asked to name a quadrilateral that is also a rhombus and has 2 pairs of parallel sides.should be his answer
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Graduation. It's believed that as many as 25% of adults over 50 never graduated from high school. We...
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