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The average score on a particular exam is determined to be 84.35 with a standard deviation of 7.4. Assume the scores are normally distributed. Applicants with exam scores in the lower 10% are directed to special retraining.
What is the minimum score required to not be directed to retraining?
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.
The manager fo the Petroco Service Station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor. Compute the two forecast by using MAPD and indicate which seems to be..
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
Test the manager's claim at 5% and 1% significance level tests.
We want to estimate the population mean within 5, with a 99 percent level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
Finnish Furniture manufactures tables in facilities located in three cities- Reno, Denver, and Pittsburgh. The tables are then shipped to three retail stores located in Phoenix, Cleveland, and Chicago.
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
According to the study, the mean age of a self-employed individual is 46.6 years with a standard deviation of 10.8 years.
A random variable is normally distributed, with (population mean)= 300 pounds and (standard deviation) = 50 pounds. How small can a simple random sample be if the standard error of the mean can be no more than 20 pounds?
What does the law of large numbers tell us about what will happen if a gambler makes very many bets on red? If the gambler keeps on playing forever he must win.
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