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Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study was then done to see if the mean time has increased in the new century. A random sample of 26 first-time convicted burglars in a recent year was picked. The mean length of time in jail from the survey was 3 years with a standard deviation of 1.8 years. Suppose that it is somehow known that the population standard deviation is 1.5. If you were conducting a hypothesis test to determine if the mean length of jail time has increased, what would the null and alternative hypotheses be? The distribution of the population is normal.
State the null and alternative hypotheses.
in a poll of 600 randomly selected subjects 240 answered yes when asked if they planned to vote in a state election.
The horseshoe crab x = width values in Table 3.2 have a mean of 26.3 and standard deviation of 2.1. If the true relationship were similar to the fitted equation reported in Section 4.1.3, namely], how large a sample yields P(type II error) = 0.10 ..
Two mating parts have critical dimensions x1 and x2 as shown below. Assume that x1 and x2 are normally distributed with means 1 and mean2 and standard deviations s1 = 0.400 and s2 = 0.300.
a manufacturer claims the average life of a product is 500 hours. the lifetime of the product is assumed to follow an
you conducted a chi-square goodness of fit test in your asci 691 capstone project. unfortunately you did not get the
when conducting a hypothesis test with chi-square analysis the null hypothesis is rejected when the differences between
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
Probability calculations reveal the following information. The probability of a favourable research report = 0.59. The probability of high sales given a favourable research report = 0.95. The probability of high sales given an unfavourable research r..
Briefly describe correlational research. Name a variable from the workplace that might prove to provide a correlational relationship and explain why you would choose these two?
When the purpose of sampling is to detect when a process becomes too variable the chart of choice will be a c-chart?
The number customers who enter a supermarket each hour is normally distributed with a mean of 600 and a standard deviation of 200. The supermarket is open 16 hours per day.
"What's good for Nori & Leets is good for the town." However, this attitude is now changing; uncontrolled air pollution from the company's furnaces is ruining the appearance of the city and endangering the health of its residents.
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