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3. Most water treatment facilities monitor the quality of their drinking water on an hourly basis. One variable monitored is pH, which measures the degree of alkalinity or acidity in the water. A target pH level is 8.5. pH values below 8.5 is acidic and above 8.5 is alkaline, both of which are bad for health. A random sample of 20 measurements resulted in an average pH of 8.55 with a standard deviation of 0.28 (10 pts) a. Does the sample provide sufficient evidence that the mean pH level in the water differs from 8.5? Conduct a test at the ? = .01 level b. What are the upper and lower limits of the 95% confidence intervals
Average (arithmetic mean) of 15 years with a standard deviation of 4 years. How does the relative dispersion in the distribution of salaries compare with that of the lengths of service?
The time required to assemble a part of a machine follows an exponential probability distribution with a mean of 14 minutes. What is the probability that the part can be assembled in 7 minutes or less?
Do you believe that the variance of sales before announcement of increasing price is equal to variance of sales after announcement?
Identify Ho and Ha for this study, conduct the appropriate analysis, and should Ho be rejected? what should the researcher conclude?
The mean on this test is 3.5 with a standard deviation of .5. Sally scores 1.5 on this test. How many standard deviations is Sally from the mean?
Uuse a level of significance of a =0.01 to test to see if you have sufficient evidence to support the claim that the defective rate exceeds 3%.
Why do you use the chi-square statistic? What type of data is used with chi square analysis?
In Major League Baseball there are five teams in the Western Division of the National League: Arizona, Los Angeles, San Francisco, San Diego, and Colorado. How many different orders of finish are there for these five teams?
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline. For each trial, a gallon of gasoline..
Over the past 20 days (20 shipments), four have been rejected & returned back to company A. Determine if there is a problem with the parts at company A.
Assume the probability that a telephone in any given telephone booth is defective is 0.2. Determine the probability that if 8 phone booths are examined, the number of defective phones is exactly 3.
Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding sales would occur between what two values?
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