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If a point randomly located in an interval (a,b) and if y denotes the location of the point, then y is assumed to have a uniform distribution over (a,b). A plant efficiency expert randomly selects a location along 500-ft assembly line from which to observe the work habits of the workers on the line. What is the probability that the point she selects is
a.) within 25 feet of the end of the line?
b.) within 25 feet of the beginning line?
c.) closer to the beginning of the line than to the end of the line?
Assume a mean wage of $1,000 and standard deviation of $100. What's the probability of finding an employee with a wage of between $790 and $1000?
Two colored dice are tossed. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
Sample without replacement when testing batches of products. When sampling without replacement, should you use the multiplication rule for independent or dependent events.
What are the null and alternative hypotheses? In what way do the two estimates of the defect rate in question 3g differ?
Compare two models. Model #1 has an r-squared of .25 and an adjusted r-squared of .10. Model #2 has an r-squared of .20 and an adjusted r-squared of .14. Given this information, what model should you use?
Between what two values does the P -value of this test fall?
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the standard deviation for the sample proportion?
State the decision rule. Compute the pooled estimate of the population varaince. Compute the test statistic
In a random sample of 15 Americans 18 years old or older, find the probability that exactly 10 have read at least six books within the past year, Interpret these results.
On weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find: No customers are waiting?
The percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence level.
A craftsperson makes stuffed animals for sale. 85% of the animals she makes are bears while the remaining 15% are rabbits. Suppose she sells 75% of her bears at craft shows but only 50% of her rabbits are sold at craft shows.
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