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A study of the scores on an in plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics: Test Scores: mean=100 variance = 225 Years of Service: mean=5 variance = 81 Of test scores and years of service, which measure has the greater dispersion?
A bowl contains R red and W white chips. Suppose N chips are drawn without replacement from the bowl.
Draw and label distribution used and position of values found.
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
The population of car speeds is approximately normally distributed. Determine a 90% confidence interval estimate for the speed of all cars.
A catering company is buying equipment in order to set up their own store. They have a choice of two ovens that they can purchase for the store.
Suppose that students in a particular school are all very competent. For each individual, the probability that they will pass the proficiency exam (independent of thier classmates) is 0.99
How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x?
Over the past 50 years, the number of hurricanes that have been reported are as follows: 9 times there were 7 hurricanes, 14 times there were 8 hurricanes, 19 times there were 11 hurricanes, and in the remaining years there were 14 hurricanes. Wha..
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
What is the probability of randomly selecting a student with a treadmill time greater than 25 minutes? In symbols, p(X>25)= ? What is the probability of randomly selecting a student with a time greater than 30 minutes? In symbols, p(x>30) ?
If a sample of 25 workers found that the average work week is 48 hours, conduct a hypothesis test to determine if there is significant evidence that the length of the average work week has increased? Use alpha=.05
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