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7.1 A single population mean using the normal distribution -- rrc  (Page 10/19)

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  • Card 10 / 19:
    Announcements for 84 upcoming engineering conferences were randomly picked from a stack of IEEE Spectrum magazines. The mean length of the conferences was 3.94 days, with a standard deviation of 1.28 days. Assume the underlying population is normal.

    In words, define the random variables X and X ¯ .Which distribution should you use for this problem? Explain your choice.Construct a 95% confidence interval for the population mean length of engineering conferences. State the confidence interval. Sketch the graph. Calculate the error bound.

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Source:  OpenStax, Statistics i - math1020 - red river college - version 2015 revision a - draft 2015-10-24. OpenStax CNX. Oct 24, 2015 Download for free at http://legacy.cnx.org/content/col11891/1.8
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