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A production line produces good articles with probability .7, average ones with probability of .2, and defective ones with probability .1.
Employers sometimes seem to prefer executives who appear physically fit, despite the legal troubles that may result
An official of the Iowa Department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads.
Let us say the life of a tire in miles, say X, is normally distributed with mean 0 and standard deviation 5000. Past experience indicates that 0=30,000.
Indicate whether the obtained r is statistically significant, and, if so, at what level. Also, would you consider the magnitude of the relationship
We will call a "desk body" a person whose intrinsic job satisfaction level is higher than their extrinsic job satisfaction level.
The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered
What is a test statistic and how is it related to a critical value in hypothesis testing?
The nationwide mean price for a 3-year old Honda civic is $8,500 with a known standard deviation of $600. You check the newspaper and find nine 3-year old
To compare the current attitudes toward prayer in the schools, a survey was conducted in four southern California counties. State your hypotheses
A taxi company manager is trying to decide if the use of radial tires instead of regular belted tires improves fuel economy
A survey was completed to estimate the proportion of residents in support of constructing a new football stadium, at tax payer expense, to accommodate
Four experimenters investigated the number of items recalled in a study of short-term memory when comparing some 25 year-old participants (Y)
Pigeons were trained to peck to obtain food. During extinction, one group of 21 pigeons was given a drug that inhibits the protein metabolism necessary
From time to time, one branch office of a company must make shipments to a certain branch office in another state
If we wish to determine whether there is evidence that the proportion of successes is higher in group 1 than in group 2, the appropriate test to use is
US physicians, health study consisted of two randomized clinical trails in one. the first tested the hypothesis that 345 milligrams of aspirin taken
A 4-day work week ensure that employees will have one more day that need not be spent at work. One possible result is a reduction in the average number
Given the following N's (where N is the number of pairs of observations) and obtained r's, indicate whether the result is significant at the .05 level:
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day
Comparing the accuracy and reproducibility of 3 different force gauges with varied angles and applied pressures. All of the gauges have a 50 lb. capacity
Develop a 90% confidence interval and a 95% confidence interval for the population mean. Did you use a z statistic or t statistics? Why?
What is the relationship between correlation and association?
For each of the following, (a) indicate what two populations are being compared, (b) state the research hypothesis, (c) state the null hypothesis
Are there other methods besides ANOVA that can be used to evaluate whether the difference in means between TWO OR MORE samples is significant?