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An instructor who taught two sections of engineering statistics last term, the first with 20 students and the second with 30, decided to assign a term project. After all projects had been turned in, the instructorrandomly ordered them before grading. Consider the first 15 graded projects.
a. What are the mean value and standard deviation of the number among these 15 that are from the second section?
b. What are the mean value and standard deviation of the number of projects not among these first 15 that are from the second section?
Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they ..
The profit from selling food at an outdoor cafe depends on the number of hours of sunshine through the formula, Profit = 1000(1-(e -x /10)). Find the expected level of profit.
If one item is chosen at random, determine these probabilities. It is a TV
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
Conduct the hypothesis test and compute the p-value. At a 0.05 level of significance, what is your conclusion?
What was the highest score earned on the exam? According to Chebyshev's Theorem, how many students scored between 42 and 74?
At the .05 significance level, can we conclude that the guideline is still reasonable?
What is your initial perception of this information? What are other ways, beyond looking at the p-value alone, you could use to try to interpret what this outcome of r(2398) = -.21 tells us about the relationship between length of time taking drug..
Suppose adults have basically distributed IQ scores with a mean of 100 and an SD of 15. Find P65, the 65th percentile. Use the Z table.
What then is the probability that a shaft will be acceptable? Suppose that the diameter of the shaft is a random variable that is Normally distributed.
Compute cumulative probabilities for these numbers in second column. Then create a histogram illustrating data distribution. Using generated Normal probability table, determine probability of Pr(X
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
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