. Let X1, X2, ... , Xn be a random sample of Bernoulli trials b(1, p). (a) Show that a best critical region for testing H0: p = 0.9 against H1: p = 0.8 can be based on the statistic Y = n i = 1 Xi, which is b(n, p). (b) If C = {(x1, x2, ... , xn) : n i = 1 xi ≤ n(0.85)} and Y = n i = 1 Xi, find the value of n such that α = P[ Y ≤ n(0.85); p = 0.9 ] ≈ 0.10. Hint: Use the normal approximation for the binomial distribution. (c) What is the approximate value of β = P[

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

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last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

idk

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he kicked it up? is this the answer ?

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too hard the other guy did it

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