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Not all dust is the same. Not all dust particles that are in the air around us cause problems for our lungs. Some particles are too large and stick to other areas of our body before they can get to our lungs.
Others are so small that we can breathe them in and out and they will not deposit on our lungs. The researchers in the study described in the previous exercise also measured respirable dust. This is dust that deposits in our lungs when we breathe it.
For the drill and blast workers, the mean exposure to respirable dust was 6.3 mg.y/m3 with a standard deviation of 2.8 mg.y/m3. The corresponding values for the outdoor concrete workers were 1.4 mg.y/m3 and 0.7 mg.y/m3. Analyze these data using the questions in the previous exercise as a guide.
A random sample of 90 voters found that 38% were going to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
Reilly Global Communications (RGC), Inc., sells communications systems to companies that have worldwide operations. Over the next year, RGC will be instituting important improvements in its manufacturing operations.
the speed of a runner increased steadily during the first three seconds of a race. her speed at half-second intervals
What measures does your department keep track of - Are they descriptive or inferential data, and what is the difference between these?
Identify whether it is an experiment or an observation study/survey. If experiment: identify experimental design, experimental units, factors & levels, response variable, and blocks (if any).
Testing for Population mean - determine if there has been a significant change in the population mean.
Discuss the advantages and disadvantages of using interview techniques and focus groups in qualitative research
A researcher wishes to estimate with 95% confidence, the proportion of adults who have high speed internet. Her estimate must be accurate within 2% of the true proportion. a) Find the minimum sample size needed using the previous study that sh..
(O (N1/2A log(NC) Hybrid Auction Algorithm) This exercise, due to Ahuja and Orlin [1987], shows how the auction algorithm can be combined with a more traditional primal-dual method to obtain an algorithm with an improved running time bound.
a popular doughnut shop makes 5000 doughnuts per day of which 30 1500 doughnuts have chocolate icing. andy likes
a survey was conducted at a local high school to determine the number of hours that a student studied for the final
Normally distributed with an average of 125 minutes and a standard deviation of 18 minutes. What is the probability that a student taking this test will finish in 100 minutes or less?
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