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Critically discuss some examples of descriptive statistics?Why are they used in research?What is a confidence interval?What is a z score, and when is it used?
For these 4 questions below what would be the independent and dependent variables, the level of measurement and whether or not the variable is discrete or continuous.
At the 5% level of significance test whether the bottling process is carried out accurately or whether the filling machinery needs calibration. Use both the critical and the p-value approaches.
A physician wanted to estimate the mean length of time µ that a patient had to wait to see him after arriving at the office.
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
A pharmaceutical company has determined that if a new cholesterol-reducing drug is manufactured (introduced to the market) the following probability distribution will describe this drug's contribution to the company profits during the next six mon..
Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
The number of items rejected daily by the manufacturer because of defects for last 30 days are:
What percent of sales representatives earn more than $42,000 per year?
Decision rule which chooses alternative associated with smallest maximum opportunity loss is?
Would the method described above be a good way to determine which team was taller (explain why or why not)?
Survey of 16 tax returns reports families with incomes between $75,000 and 100,000 have on average $8,562 in Standard Deductions with the standard deviation of $1,800.
If an original set of measurements is made in inches and has mean of 36 and variance of 144, what will be the mean, variance, and standard deviation if:
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