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The board of health of a particular state was called to investigate claims that raw pollutants were being released into the river flowing past a small residential community. By applying financial pressure, the state was able to get the violating company to make major concessions toward the installation of a new water purification system. In the interim, different production systems were to be initiated to help reduce the pollution level of water entering the stream. To monitor the effect of the interim system, a random sample of 50 water specimens was taken throughout the month at a location downstream from the plant. If = 5.0 and s = .70, use the sample data to determine whether the mean dissolved oxygen count of the water (in ppm) is less than 5.2, the average reading at this location over the past year.
a. List the five parts of the statistical test, using a = .05.
b. Conduct the statistical test and state your conclusion.
According to the 1996 Statistical Abstract of the United States, 7.6% of the scores on the verbal portion of the Scholastic Aptitude Test (SAT) exceeded 600.
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
Tthe population standard deviation is not equal to 8 at the 0.05 level of significance. Calculate the value of the test statistic.
Suppose that two teams are playing a series of games, each of which is independently won by team A with probability p and by team B with probability 1-p. The winner of the series is the ?rst team to win four games. Find the expected number of game..
For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean.
1. one classic application of correlation involves the association between the temperature and the number of times a
Comparing dexterity-test scores of workers on the day shift versus those on the night shift, the production manager of a large electronics plant finds that a sample of 37 workers from the day shift have an average score of 73.1, with a standard..
A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes? (Round your answer to 4 decimal places.)
the total number of cars and light-duty trucks sold in 2013 was 2.234 million while 1.346 million were sold in 2009.
What is the mean of this uniform distribution? What is the standard deviation?
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
an urn contains six balls of which three are red and three are green. two balls are selected from the urn. if one ball
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