Mathematics, 02.12.2019 21:31 natalie857123
The national assessment of educational progress (naep) includes a mathematics test for eighth-grade students. scores on the test range from 0 to 500. suppose that you give the naep test to an srs of 900 eighth-graders from a large population in which the scores have mean μ = 285 and standard deviation σ = 125. the mean x will vary if you take repeated samples.
suppose that we took an srs of 1600 eighth-graders and found x = 288. compared with an srs of 900 eighth-graders, the margin of error for a 95% confidence interval for μ is which of the following?
a)smaller
b)larger
c) either smaller or larger, but we can't say which
Answers: 1
Mathematics, 22.06.2019 00:00, xXwolfieplayzXx
Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?
Answers: 3
Mathematics, 22.06.2019 01:10, girdwood797
|p| > 3 {-3, 3} {p|-3 < p < 3} {p|p < -3 or p > 3}
Answers: 2
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