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A social worker is interested in estimating the average length of time spent outside of prison for first offenders who later commit a second crime and are sent to prison again. A random sample of n = 150 prison records in the county courthouse indicates that the average length of prison-free life between first and second offenses is 3.2 years, with a standard deviation of 1.1 years. Use they sample information to estimate m, the mean prison-free life between first and second offenses for all prisoners on record in the county courthouse. Construct a 95% confidence interval form. Assume that s can be replaced by s.
Find the area between z = -0.65 and z = 0.37, find the area to the right of z = 2.35
Each year approximately 160 colleges compete in national concrete canoe competion. Each team should design a seaworthy canoe from a substance not known for its capacity to float. T
Compare the computed linear correlation coefficient r to the critical value of r at the 5% significance level to determine whether there is a linear correlation between the two characteristics. Does the slope of the regression line appear to indic..
the probability that a parent rewards a child with a dessert for eating a healthy meal is .07. assuming independent
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
Can people really identify their favorite brand of cola? Volunteer tasted coca-cola classic, pepsi, Diet coke, and Diet pepsi, with the results shown below.
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.
Let x = number of the ball obtained on any selection. Then the probability distribution for x is given by:
Student received the following grades last semester. Find the student's semester grade point average. Course Credits Grade/Points Statistics 4 A / 4.0.
the manager of a computer software company is studying the number of hours too executives spend at their desktop
How do you verify that the assumption of a normal distribution is correct if you've only the mean and standard deviation?
Compute the M-W U and test it for significance. What does your decision mean in the context of the exercise?
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