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1. Colleges conduct student evaluations of instruction to determine if there are patterns of either excellence or the lack thereof by their instructors. These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below (5 is agree strongly to 1 is disagree strongly) for the statement "The instructor is an excellent teacher."
The P-value for the χ2 test isA. more than 0.10.B. between 0.05 and 0.10.C. less than 0.05.
2. Colleges conduct student evaluations of instruction to determine if there are patterns of either excellence or the lack thereof by their instructors. These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below (5 is agree strongly to 1 is disagree strongly) for the statement "The instructor is an excellent teacher."
In a test of no association between these variables, we are really studying a model ofA. independence.B. comparing several populations.C. Neither choice is correct.
3. We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as "yes" or "no." If I analyze the data with both a z test for two proportions and a χ2 test of no association, the P-value for the z testA. will be less than for the χ2 test.B. will be the same as for the χ2 test.C. will be more than for the χ2 test.
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
LINEAR PROGRAMMING MODELS
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
If a blue ball is selected you win nothing. Let X be the amount that you win. The expected value of X and let the random variable X be a random number with the uniform density curve given below
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
Problems on Sampling Variability and Standard Error and Confidence Intervals
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