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DarkendSinz30

  • 3 years ago

I really need help in understanding this??

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  1. DarkendSinz30
    • 3 years ago
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    Consider a population with u=70.2 and o=4.61. (A) Calculate the z-score for x=73.2 from a sample of size 10. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?

  2. CliffSedge
    • 3 years ago
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    I take it u=µ and o=σ? I can't help you with what Appendix B is in your book, but I can show you the z-score formula.

  3. DarkendSinz30
    • 3 years ago
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    Yeah the symbols are that way and I think I have the z-score formula but could use a refresher

  4. CliffSedge
    • 3 years ago
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    \[\huge z=\frac{x-µ}{s_x}\] \[\huge s_x = \frac{σ}{√n}\]

  5. DarkendSinz30
    • 3 years ago
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    I have Appendix B table 3 pulled up from my book so if we can get the problem solved I can do the rest please

  6. CliffSedge
    • 3 years ago
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    Cool. Use those formulas, and you should be fine. Try here for more info: http://stattrek.com/probability-distributions/standard-normal.aspx?tutorial=ap http://stattrek.com/sampling/sampling-distribution.aspx?Tutorial=AP

  7. DarkendSinz30
    • 3 years ago
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    Thank you so much so far everything I have looked at including my text book has been confusing.

  8. CliffSedge
    • 3 years ago
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    Stats is a messy place. It takes a strong combination of mathematical skill and good ol' common sense. Good luck!

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