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The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean explenditure was calculated to be $500 and the standard deviation of the expenditures was calculated to be $100. Suppose a randomly selected student reported that their text book expenditure was $700. Calculate the z-score for this student's textbook expenditure.
How do air carriers price their services? Is the weight or density of the shipment a factor? Explain this factor as part of your answer. How does air carrier pricing re- late to the value of the goods being transported?
What is the purpose of statistical estimation? What statistics do you find most useful in regression analysis? Why?
Compute the value of t. What is your decision regarding the null hypothesis?
A laboratory scale is known to have a standard deviation of = 0.001 gram in repeated weighings. Scale readings in repeated weighings are normally distributed, with mean equal to the true weight of the specimen.
The companies can only offer one of three possible plans. One of the companies (South Wireless) contracted a market study to estimate the potential number of customers under each circumstance.
Explain and give an example of: z-tests, t-tests, single sample t-tests, a dependent sample t-test, or an independent sample t-test.
scores on an endurance test for cardiac patients are normally distributed with mean 200 and standard deviation 30.a
slot machines have three drums with the same number of positions on each drum. each position contains a symbol. when
the heights and weights of 11 men between the ages of 21 and 26 were measured. the data are presented in the table
You've two separate sets of data. From one set you calculate the standard error to be 500. From the other set, the standard error was 5.
The Split-A-Rail Fence Company sells three types of fence to homeowners in suburban Seattle, Washington. What was the mean cost per foot of fence installed?
Suppose the exogeneity assumption holds. Can you use the data to show that a response schedule is false? Usually? Sometimes? Hardly ever? Explain briefly.
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