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The scores on this exam for all students statewide have a normal distribution with a mean of 531 and a standard deviation of 30. A local Junior High principal has decided to give an award to any student who scores in the top 15% of statewide scores. How high should a student score be to win this award?
Given the variances of the two samples below, find the test value and the degrees of freedom that should be used in an F test.
Find a 99% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the margin of error? (Round your answers to one decimal place.)
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
A car manufacturer tests the first 1,000 cars coming off the assembly line to see if their new anti-lock braking system works correctly. Use the typical values for control limits.
Determine the proportion of variation in grade that can be explained by the linear correlation between the grade and the number of credit hours earned at the same time of taking the course.
Three times each year, the procurement manager at Phoenix contacts National\'s marketing department to place a monthly order for each of the coming four months.
Which of the following Venn diagrams has shaded the event that the contractor wins exactly one of the contracts and evaluate the mean time to complete the entire homework assignment
A random selection of accounting firms from three regions is taken and they are asked to state the starting salary for a new accounting graduate. Do a one-way ANOVA to analyze these data using a 1% level of significance:
Assume that the standard deviation of college student IQ's is 10. A random sample of 100 students from a college showed an average IQ of 110. Compute a 95% confidence interval for the mean IQ of students attending this college.
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
A certain disease occurs in 35% of the population. A test for the disease is fairly accurate: it misclassifies people with the disease as healthy 6% of the time and reports that a healthy person is diseased just 7% of the time.
The times it takes workers to complete a task at a certain assembly plant are normally distributed with mean = 10 minutes and standard deviation = 2 minutes.
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