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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.
What symbol represents the Random Variable for this test?
Find a five-number summary for these data.- Identify whether or not any data points would qualify to be marked as an outlier on a boxplot. If there are outliers, specify the values.
A writer wants to know how many typing mistakes there are in his manuscript, so he hires a proofreader, who reads the entire manuscript and finds 15 errors.
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
a researcher conducts an independent-measures study examining how the brain chemical serotonin is related to
a b c and d are taking goal shots in soccer. they take shots in the order a b c d then repeat. by going in this order
a hat contains n coins f of which are fair and b of which are biased to land heads with probability 23. a coin is drawn
A mainframe computer in a university crashes on the average 0.71 time in a semester. What is the probability that it will crash at least two times in a given.
An orange juice producer buys only one kind of oranges. The amount of juice squeezed from each of these oranges is approximately normally distributed with a mean of 4.2 ounces and a population standard deviation of 1 ounce.
A local Real Estate agent was compiling an overview of the Rental Market in his Suburb, to determine the profile of the length of rental contracts. In order to determine this he took a random sample of 65 completed Rental Agreements and recorded t..
1. What kind of change is the 365 store chain? 2. How will the 365 store change result in 2 other kinds of change. 3. Analyze the 365 store chain change in terms of Strategic Planning at WFM.
A study was conducted to compare two different procedures for assembling components. Both procedures were implemented and run for a month to allow employees to learn each procedure. Then each was observed for 10 days with the following results. Va..
The shrimp survey data (Examples 1 and 2) give a covariance function c(x) = 5.1 exp(-0.49x), where x is distance in nautical miles. The catches at sites 1 and 2, which are 3 nmi. apart, are 1.200 and 2.400, respectively (units are in thousands of ..
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