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A recent report from the American Medical Association claims that for the first time in ten years, the average salary of psychiatrists was greater than $190,000 with a standard deviation of $27,000. What is the null hypothesis for his claim?
The Eagle Ridge Contractors Association claims the average price of a home in their subdivision is $125,250. A sample of 36 homes for sale in this subdivision has an average selling price of $127,500 with a standard deviation of $7,250. At alpha = 0.05, what is the test value?
What is the critical t-value for a two-tailed test when alpha = 0.02 and d.f. = 19?
what is the probability that an organization selected at random will have at least one of the three types of benefits?
Find the margin of error in estimating the population mean: confidence level = 94%; sample size=86; sample mean = 113.5; and standard deviation = 12.7.
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
When using dummy variables in a regression equation to model a qualitative or categorical variable, the number of dummy variables should equal to
Write introduction to SPC (STATISTICAL PROCESS CONTROL)? Describe the use of SPC tools used at D2D?
Solve different inventory control problems using an appropriate OR method.
The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2.
Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
Suppose we want to compare the observed and expected number of events among the group 250 treatments.
A produce manager wants to estimate the mean size of coke bottle fills with 95 percent confidence. A preliminary sample of 12 bottles shows a sample standard deviation of 3 mil, and mean of 500.
You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
When coaching or training athletes, the tests employed to predict performance or determine training methods incorporate statistical methods. Why are these methods so effective?
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