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A local courier service sends packages to Oakland and offers a money back guarantee that each package will be delivered within 24 hours. The courier service sends 70% of packages by plane, 20% by train, and10% by van. If a package is sent by airplane, the probability it is delivered within 24 hours is 0.96. For packages sent by train and van, the probability they are delivered within 24 hours are 0.92 and 0.87,respectively.
(a) What proportion of the time will the courier service meet its guaranteed delivery time?
(b) If a package fails to reach Oakland within 24 hours, what is the probability it was sent by train? (with all steps please)
The mean amount purchased by a typical customer at Churchill\'s Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the foll..
State the largest possible domain for the definition of the function. f(x,y) = cube-root(y^2-x)
If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?
Far separated sample means + differences of sample means are large compared to their internal (within) variability! Which of the following examples indicate group diff"s are "large"?
in random samples of 900 men and 400 women it is found the 99 men and 36 women suffer from kidney stones. is there
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
We have administered an anxiety test to all members of the class. The mean anxiety score is 71 and the standard deviation is 9. (higher score=higher anxiety)
Would it be reasonable to conclude that less than 5 percent of the employees are not able to pass the random drug test?
a rational decision maker must choose between two alternatives. alternative 1 has a higher emv than alternative 2 but
What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
That will reveal the interval estimate for the proportion of people who like cats within a target population of 60,000 people. How would you interpret the results?
Explain the distribution of mean of samples of size 15.
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