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A Survey of Probability Concepts
Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems. She has also determined that among those who do their assignments, 90 percent will pass the course. Among those students who do not do their homework, 60 percent will pass. Mike Fishbaugh took statistics last semester from Dr. Stallter and received a passing grade. What is the probability that he completed the assignments? What is the probability that he completed the assignments?
One-fourth of the residents of the Burning Ridge Estates leave their garage doors open when they are away from home. The local chief of police estimates that 5 percent of the garages with open doors will have something stolen, but only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?
State the number of degrees of freedom that are associated with each of the following extra sum of squares and why this is the case:
Students in the social work course received the following course grades. Create a frequency distribution for this data. Compute the mean. Determine the median.
If the rods' lengths produced by your line are normally distributed, with a mean equal to the target of 0.2 meters, and a standard deviation of 0.015m, what percentage of rods will be scrapped?
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
Use a 0.01 significance level to test the claim that most people believe that the Loch Ness monster exists. How is the conclusion affected by the fact that Internet users who saw the question could decide whether to respond.
Testing for two Proportions - Is the difference between the averages statistically significant?
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
Find the mean and standard deviation of X, the number of students in class, who will develop influenza.
Consumer Reports published an article on some sport-utility vehicles they had tested recently. They reported some basic information about each of the vehicles and the results of some tests conducted by their staff.
Why do you think it is significant to describe both the measure of central tendency and the measure of dispersion when talking about a data set?
How close is the calculated value to your experimental value?
If a student is randomly selected what is the possibility that the student is male and from out of state.
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