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Your manager has given you an Excel file that contains the names of the company's 500 employees and has asked you to sample 50 employees from the list. You decide to take your sample as follows. First, you assign a random number to each employee using Excel's random number function Rand (). Because the random number is volatile (it recalculates itself whenever you modify the file), you freeze the random numbers using the Copy-Past Special-Values feature. You then sort by random numbers in ascending order. Finally, you take the first 50 sorted employees as your sample. Does this approach constitute a statistical or a nonstatistical sample?
Test the claim of the engineering firm. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
The number of ferromagnetic artifacts for each plot is determined. The variable in this information is number of ferromagnetic artifacts per 100 square meters.
Compute mean absolute percentage error (MAPE) of the forecasts.
Determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. The value of the test statistic and the p-value respectively are?
In an industry,200 workers,employed for a specific job,were classified according thier performance and training received/not received to test independence of specific trainig and performance.The dates is
What is the probability that at least one of the alternations is discovered? Find the expected value and variance of the number of altered accounts discovered during the audit.
The times it takes workers to complete a task at a certain assembly plant are normally distributed with mean = 10 minutes and standard deviation = 2 minutes.
Graph the p.d.f and show that the probability of the part failing in the first 200 weeks is 1/8
Develop a frequency distribution showing all frequencies, cumulative frequencies, and relative frequencie
If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.
With a mean of 696 grams and a standard deviation of 37 grams. If you pick one fruit at random, what is the probability that it will weigh between 573 grams and 619 grams.
At the .05 level of significance, is there evidence that that the proportion of delayed Southwest Airlines departures from Phoenix in January 2008 is greater than 25%? State the decision in terms of the problem.
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