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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 shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is unknown.
The price of shares of Bank of Florida at the end of trading each day for the last year followed the normal distribution. Assume there were 240 trading days in the year.
A manufacturer of microwaves gathers information on microwave sales from a random sample of 50 stores in a large retail chain. In the sample, the mean number of microwaves sold per store last week was 19, with standard deviation 2.
Why do you use the chi-square statistic? What type of data is used with chi square analysis?
a organic food company wants to determine the best process for blanching dark green vegetable material so it can be
an exit poll of 1000 randomly selected voters found that 515 favored candidate a. is the race too close to call? answer
find the values of t that bound the middle 0.8 of the distribution for df 25. give your answers correct to two decimal
Weekly income of more than $429.35, the value of the standard deviation of the weekly earnings of the bus drivers is 15. is it true?
What is the current breakeven cost? What would happen to the breakeven point if we lower our fixed costs by $100,000 but increased our variable cost by $5 per unit?
for a normal distribution find the z-score values that separate the middle 80 of the distribution from the 20 in the
the probability distribution of x the number of imperfections per 10 meters of a synthetic fabric in continuous rolls
Construct a 99% confidence interval for the population mean tread wear for this type of tire.
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