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1. A city sewer maintenance crew maintained an average of 248 sewer lines per day two years ago. Upon providing more efficient equipment, a sample of 64 sewer-work days shows that a mean of 260 sewer lines were maintained, with a standard deviation of 48 sewer lines. What is the probability that a sample of with this mean could be drawn if the new trucks show no improvement (Note that the population mean is 248)? 2. The failure rate in a community college could jeopardize funding when the rate rises above 20%. The community college district takes a sample of ten schools within the college district and finds the following failure rates: 10.8%, 17.2%, 8.2%, 17.8%, 15.6%, 8.2%, 17.2%, 15.6%, 17.8%, and 10.8%. What is your best estimate of the failure rate in the college district? Is it likely that the failure rate is greater than 20%? 3. The County Department of Children's Services in Bunker County is worried about employee absenteeism. In the previous year, the average employee missed 25.6 days. As a result, an experimental program for which the agency pays employees for each unused sick day or personal day was instituted. A preliminary survey of 40 employees reveals a mean of 17.4 days missed and a standard deviation of 9.6. Present a research hypothesis (alternative hypothesis) and a null hypothesis, and evaluate them.
The majority of the data is basically distributed if there are enough subjects. For instance, if you collected test scores of only a few honor students, the data will most likely not be normally distributed because you would have a sample that did..
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
Discuss the role of sensitivity analysis in LP. Under what circumstances is it needed, and under what conditions do you think it is necessary?
Determine the probability that Mary obtains exactly one Head.
For a given level of significance, if the sample size is increased: the power of the test will increase we will have more responses to log and calculate it will skew the mean to the right it has no effect on the direct results.
Modify (change) your sample size to 18600. Construct a new 95% Confidence Interval.
it is estimated that the arrival rate to the drink stand during a typical peak hour on a peak day will be 100 customers
Conduct a matched pairs t-test to see if the differences in locations is significant - The air in poultry-processing plants often contains fungus spores.
using a binomial table find the binomial probabilities px associated with given n ratio and x. a. n6 ratio 0.10 p4 b.
Find the margin or error for the 95% confidence interval used to estimate the population proportion. In a survey of 7100 TV viewers, 38% said they watch network news programs.
In government data, a household consists of all occupants of a dwelling unit, while a family consists of two or more persons who live together and are related by blood or marriage. So all families form households, but some households are not famil..
Test the hypothesis that the annual income of teachers in areas of more than 500,000 is significantly more than those in areas of less than 100,000. Use the 5% level of risk.
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