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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. Conduct a hypothesis test to determine if the mean length of jail time has increased. The distribution of the population is normal.
Since both σ and sx are given, which should be used? In 1 -2 complete sentences, explain why.
Home Prices A real estate agency says that the mean home sales price in Spring, Texas, is the same as in Austin, Texas. The mean home sales price for 25 homes in Spring is $127,414. Assume the population standard deviation is $25,875.
Prepare a table (refer Table 2.6 of the text book) showing in columns Audit Time Intervals (days), Frequencies, Cumulative Frequencies, Relative Frequencies, Cumulative Relative Frequencies, Percent Frequencies, and Cumulative Percent Frequencies
Since the Great Depression of the 1930s. the link between the suicide rate and the state of the economy has been the subject of much research. Research exploring this link using regression analysis was reported in the Journal of Socio-Economics (S..
In a suitable one-tail test at the 0.01 level, was the mean age for doctors having the greatest problems with difficult patients significantly less than that for those having the least problems with difficult patients? Identify and interpret the p..
audrey an astronomer is searching for extra-solar planets using the technique of relativistic lensing. though there are
molecular-weight di carboxylic acid (Environmental Science & Engineering, Oct. 1993). The di carboxylic acid (as a percentage of total carbon) and oxidant concentrations for 19 air specimens collected from urban
What is the average size of a city in the country? (This is the arithmetic mean of the populations of the cities, and is also the expected value)
The "average" income of American households in 1998 was either $38,885 or $51,855, depending on whether we use the mean or median to measure center. We can say
During the month, the actual total variable manufacturing overhead was $48,970 and the actual total fixed manufacturing overhead was $43,000. The actual level of activity for the period was 8,300 MHs. What was the fixed overhead budget variance fo..
Given the following data from two independent samples, conduct a one-tailed hypothesis test to determine if the first sample mean is larger than the second sample mean, given a 0.05 level of significance.
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
According to Chebyshev's theorem, what is the minimum probability that a random variable will be within 4 standard deviations of its mean?
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