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    Descriptive Statistics, Student and Enrollment Distribution

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    Question 1 and 2 involve the random variable x with probability distribution given below.

    x -2 4 5 6 7
    P(x) 0.15 0.05 0.3 0.1 0.4

    determine the expected value of x.

    determine the standard deviation of x.

    #2
    Below is a compilation of student distribution in our four statistics classes from the summer of 2009.

    course stat 200 stat 225 stat 230 stat 250

    percentage 45.8 12.0 32.8 9.4

    #3
    The enrollment report for the summer of 2011 is given as follows

    course stat 200 stat 225 stat 230 stat 250

    frequency 249 71 133 47

    At the 1% significant level, do the data provide sufficient evidence to conclude that 2011's enrollment distribution differs from the 2009 distribution?

    Show all work: include the hypotheses, the computation of the test statistic, state the critical value, and state the conclusion of the test.

    © BrainMass Inc. brainmass.com June 4, 2020, 2:14 am ad1c9bdddf
    https://brainmass.com/statistics/dispersion-and-spread-of-data/descriptive-statistics-student-and-enrollment-distribution-447979

    Solution Summary

    The following posting helps calculation expected value, standard deviation, and helps determine student distribution and enrollment distribution. Calculations are given in Excel.

    $2.19

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