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An auditor claims that the average annual salary of a project manager at a construction company exceeds $82,000. A random sample of 20 project managers had an average salary of $89,600 with a sample standard deviation of $12,700. Assume the salaries of the managers are normally distributed. You want to test the claim at the alpha = 0.01 significance level. If using the "critical value approach" for your hypothesis test, what will be your critical value(s)?
a. approximately 2.539b. approximately 2.680c. approximately 2.33d. none of the above
Test to see if four population means are the same or different. Assume the populations are normally distributed and have equal variances. Use the formal hypothesis-testing model. State the conclusion in statistical terms and in conversational English..
Assuming that the diameters are normally distributed, find the standard deviation of the distribution. Compute the proportion of rejects if the permissible limits are changed to 2.985 and 3.015 cm
you are asked to determine whether or not brunette students have a higher iq score than other students. to do so you
Suppose you take a random sample of 25 from a lot of 1,000 items but later realize that you should have selected a sample of 40 items instead. How do you correct this error?
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
What is the probability of someone entering a code at random and gaining entry to the building?
question suppose you draw a card randomly from a regular deck of cards. let abe the event that the card is red and
The heights in inches of 18 randomly selected adult males in LA are listed as: 70, 69, 72, 57, 70, 66, 69, 73, 80, 68, 71, 68, 72, 67, 58, 74, 81, 72. Display the data in a stem-and-leaf plot.
the average gas mileage of a certain model car is 30 miles per gallon. if the gas mileages are normally distributed
For most modern programming languages, scanners require little context information. That is, a token can be recognized by examining its text and perhaps one or two look ahead characters.
Doctors often use body mass index (BMI) to measure obesity. BMI is weight/height2, where weight is measured in kilograms and height in meters.
Can the classical approach to probability be used to determine P (less than 60 seconds between green lights)? Why or why not? (d) What about the relative frequency approach? If so, how? If not, why not?
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