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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.
in the united states the average weight of an adult male is 172 pounds with a standard deviation of 29 pounds. assuming
Based on the sample data, and using the 0.025 level of significance, can we conclude that the new exhibit has increased the average contribution of exhibit patrons? Identify and interpret the p-value for the test.
Define the terms parameter and statistic. Be sure that the concepts of population and sample are included in your definitions.
An exam consists of 10 true or false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly six questions correctly? (Round the answer to three decimal places)
Which is more likely to occur-more than 60% correct identifications in the sample of 200 or more than 55% correct identifications in a sample of 1,000? Explain.
Develop a 95% confidence interval for the mean amount of household income for sub- scribers to Young Professional magazine. Interpret this interval.
An appliance manufacturer is considering the purchase of a new machine for stamping out sheet metal parts. If μ0 (given) is the true average of the number of good parts stamped out per hour by their old machine and μ is the corresponding true unkn..
westside bakery is considering opening a new branch in abingdon il. westside will initially sell sell only loaves of
a financial analyst claims that the return rate of a 15-year bond has a standard deviation of 6.8. determine whether
A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 ± 0.25 cm. The company has established an -chart and an R-chart using samples of size five.
A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on the average, they spent 6.5 years on the job before being promoted.
from a box containing 4 dimes and 2 nickels 3 coins are selected at random without replacement. find the probability
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