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1. A die is rolled 720 independent times. Compute, approximately, the probability that the number of fives that appear will be between 1 10 and 125 inclusive.
2. A part is produced with a mean of 6.2 ounces and a standard deviation of 0.2 ounce. What is the probability that the weight of 100 such items is between 6 l6 and 624 ounces?
3. Let X., . . . , X 25 be a random sample of size 25 from a distribution having p.d.f. /(x) = x/6 , x = 1, 2, 3, zero elsewhere. Approximate Pr (.,f_ , X; = 50, 51, . . . , or 60).
Find the probability that in a given month a) there are exactly 9 days with 0.01 inch or more precipitation, b) there are at most 9 days.
use the one-proportion z-interval procedure to find the required confidence interval. be sure to check the conditions
Pretend you are in charge of a packaging equipment company that is filling boxes of cereal. From past experience we know the population's mean weight of the filled boxes is 300 grams (and we know the distribution of grams is approximately normal).
find the margin of error for the given values of cs and n c0.80 s4 and n8the margin of error is round to one decimal
Why do we need a new test method to compare the means of 3 or more populations? Why can't we just use a series of z-tests or t-tests to compare all of the possible pairs of population means to see if one (or more) is different?
Test research hypotheses that there is a difference in level of education between liberals and conservatives, set alpha at .01. Would your decision have been different if alpha were set at .05?
1. you want to have 1 million in your investment account in 17 years and estimate that you ran earn an 12 rate of
Use an appropriate test to determine if the reason for component failures is independent of their designs. Show your manual calculations here.
Find the equivalent Z score, the percentage of the area above the score, and the percentage of the area below the score.
What would the approximate number of housing starts be at the following interest rates and lumber prices:
a researcher wishes to test the effectiveness of a flu vaccination. 150 people are vaccinated 180 people are vaccinated
The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviat..
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