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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.
At the 5% level of significance, is there evidence of a difference among the mean access read times for the three files sizes?
in a 2 x 3 x 3 analysis of variance the number of cells
While some teenagers received no allowance, others reported receiving $200 per week. Based on this information, the mean allowance for U.S. teenagers is most likely 0 $50.
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "do you enjoy shopping for clothing?" Of 240 males, 136 answered yes.
1.some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and
a simple system consists of four components placed in parallel. each component has the same reliabity r. if we want the
1 test of two means. you should select a hypothesis you are interested in testing and then use a test of two means to
Critically illustrate out the difference between a histogram and a dot plot. When might a dot plot be better than a histogram?
The data is shown on the table. Is there a difference in mean SBP between treatments? Run the appropriate test at α= 0.05
the population in millions and the violent crime rate per 1000 were recorded for 10 metropolitan areas. the data are
what is the correlation between leadership trustworthiness and ethical stewardship? support your
the following information is available about the distribution of the price of single family homes in an area median
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