Mathematics, 16.11.2019 02:31, Sfowler5129
The burning rates of two different solid-fuel propellants used in aircrew escape systems are being studied. it is known that both propellants have approximately the same standard deviation of burning rate, that is sigma 1 = sigma 2 = 3 centimeters per second. two random samples of n 1 = 20 and n 2 = 20 specimens are tested, the sample mean burning rates are x 1 = 18centimeters per second and x 2 = 24 centimeters per second.
a) test hypothesis that both propellants have the same mean burning rate. use alpha = 0.05. what is the p - value ? .
b) construct a 95% confidence interval on the difference in means mu 1 - mu 2. what is the practical meaning of this interval?
c) what is the beta-error of the test in part (a) if the true difference in mean burning rate is 2.5 centimeters per second?
Answers: 2
Mathematics, 21.06.2019 15:00, lm18618
Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.
Answers: 2
Mathematics, 21.06.2019 17:10, jonathan3191
Empty box + box + empty box fill in the box is equal to 30 how
Answers: 2
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