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A trial program is carried out to lower the recidivism rate of convicts (that is, the rate at which released prisoners commit additional crimes). The program selects men in county jails serving two years or less according to the first letter of their last name: prisoners with last names beginning with the letters A-M receive intense drug rehabilitation, psychotherapy (if needed) and help finding a job after their release. Prisoners with last names beginning with letters N-Z receive no additional aid.
1) How would you estimate the effectiveness of the treatment? Suppose you had information on age Could you use this information to improve your estimate? Please explain. Suppose you had information on the number of prior convictions. Could you use this information to improve your estimate? Please explain.
A professor receives, on average, 24 emails from students the day before the midterm exam. To compute the probability of receiving at least 10 emails on the next day before the midterm she would use which probability distribution?
the roll of a pair of dice has the following probability distribution where the random variable is the sum of the
the image of the public library is constantly changing and their online services continue to grow. usage of the
When groups are more alike than different, ANOVA assesses the significance of the difference between two groups. When groups are unalike, will findings be more significant?
question a professor used data from last semesters statistics class to create a regression that predicts how students
suppose that the mean iq of the 85 students in your classes is 110 and you know that the standard deviation of iq
A medical researcher suspects that the pulse rate of smokers is higher than the pulse of non smokers. Use the sample statistics below to test the researchers suspicion.
q1. consider the following time series.t 1 2 3 4 5 6 7yt 120 110 100 96 94 92 88a. construct a time series plot. what
in a random sample of 400 minnesota residents 330 have home internet access whereas in a random sample of 900 wisconsin
gender and belief in afterlife. the table shows results from the 2008 general social survey on gender and whether or
If the sample standard deviation is s = 10, are the data sufficient to conclude that the treatment has significant effect using a two-tailed test with α = .05?
What are some differences between discrete and continuous data? Is the measurement of money continuous or discrete? Explain. Can discrete data be analyzed using a normal distribution? Why or why not?
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