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    Confidence Intervals and Graphing: Hours Spent Training Per Year

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    A study of hours spent in training (per year) at a company was conducted with 49 participants. The mean number of hours spent in training was reported to be 89.25 hours. The standard deviation was 13.44 hours.

    1. Calculate a 95% confidence interval for the average time spent in training per year at this firm.

    2. Create a graph showing the data below as a frequency distribution. Note the mean and the confidence interval on the graph.

    $210 220 230 240 270 300 300 320 320 320
    340 370 370 380 400 410 450 450 470 470
    490 500 500 510 510 540 570 580 580 640
    490 500 500 510 510 540 570 580 580 610
    610 620 640 640 650 660 690 750 760 790

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    Solution Preview

    1. Calculate a 95% confidence interval for the average time spent in training per year at this firm.

    Data:
    n = 49
    x-bar = 89.25
    s = 13.44
    % = 95

    Standard Error, SE = s/√n = 1.9200
    Degrees of freedom ...

    Solution Summary

    The Solution provides Confidence interval and the graph. The frequency distribution is determined.

    $2.49

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