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Quality control studies for Leaky Jet Computer Printers show the lifetime of the printer follows a normal distribution with a mean of 4.5 years and a standard deviation of 0.85 years. The company will replace any printer that fails during the guarantee period. How long should Leaky Jet Printers be guaranteed if the company wishes to replace no more than 8% of the printers?
You're asked to determine whether the workers live in the community. Your personnel department provides the following table:
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
If you use a 0.10 level of significance in a two-tail hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean is 500 if you use the Z test?
In a normal frequency distribution, 32% of the cases:
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
One of the main measures of the quality of service provided by any organization is the speed with that responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a chief ex..
Using the EMV criteria (you wish to maximize expected profits in this case) determine what course of action that Optel should take. Make sure to state the best strategy in words.
Describe 5 data collection techniques in your own words. Explain why the four demographic questions you included in your survey are important and or are of interest to the study.
A 'good' correlation is data-context driven. For example, I did a project correlating sales volume per state and customer demographics (pretty 'hard' data) and got a .92 correlation.
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
Estimating a linear regression equation to predict the future values of the dependent variable Y.
How many ounces should they advertise on the box if they want to be sure that no more than 0.5% of the boxes are filled less than that advertised amount?
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