Mathematics, 07.04.2020 23:21, lilGi0
A researcher wants to test the claim that the proportion of boys who play with blocks regularly is greater than the proportion of girls who play with blocks regularly. She finds that 23 of 51 randomly selected boys and 17 of 23 randomly selected girls report playing with blocks regularly. A 98% confidence interval for the difference in population proportions is (−0.5558, −0.0205). Which of the statements gives the correct outcome of the researcher's test of the claim?
The researcher cannot draw a conclusion about a claim without performing a significance test.
Because the confidence interval is negative, the researcher can conclude the proportion of boys and girls who play with blocks regularly is the same.
Because the confidence interval is negative, the researcher can conclude the proportion of boys and girls who play with blocks regularly may be the same.
Because the confidence interval is negative, the researcher can conclude there is a greater proportion of boys who play with blocks regularly.
Because the confidence interval is negative, the researcher can conclude there is a greater proportion of girls who play with blocks regularly.
Answers: 3
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 04:00, triciazeeck62311
Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !
Answers: 3
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