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KonradZuse

The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitudes, and study habits of college students. Scores range from 0 to 200 and follow (approximately) a Normal distribution, with mean of 115 and standard deviation 25. A researcher suspects that incoming freshmen have a mean μ, which is different from 115, because they are often excited yet anxious about entering college. To verify her suspicion, she tests the hypotheses H0: μ = 115 Ha: μ 115. The researcher gives the SSHA to 100 incoming freshmen and observes a mean score of 119. Assume that the scores of all incoming freshmen are approximately Normal with the same standard deviation as the scores of all college students. Reference: Ref 13-5 If the researcher deems the data to be statistically significant, which of the following is true with respect to a conclusion reached? A. The researcher has strong enough evidence to conclude that the average freshmen SSHA score differs from that of the average SSHA score for all college students. B. The researcher does not have strong enough evidence to conclude that the average freshmen SSHA score differs from that of the average SSHA score for all college students. C. The researcher has proven that the mean SSHA score for freshmen is, in fact, 115. D. The researcher has proven that the mean SSHA score for freshmen is not 115.

  • one year ago
  • one year ago

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  1. KonradZuse
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    @jim_thompson5910

    • one year ago
  2. KonradZuse
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    lemme read this shizzle first :p

    • one year ago
  3. jim_thompson5910
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    lol that might help...

    • one year ago
  4. KonradZuse
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    wait this is the Q we did 2 days ago LOL.

    • one year ago
  5. jim_thompson5910
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    we did

    • one year ago
  6. jim_thompson5910
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    well sorta

    • one year ago
  7. jim_thompson5910
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    remember statistically significant means that p value < alpha -----> reject H0

    • one year ago
  8. KonradZuse
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    Well it seems that A is the most correct answer, but D could be correct also.

    • one year ago
  9. KonradZuse
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    sorry was chatting business with Dad.

    • one year ago
  10. KonradZuse
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    @jim_thompson5910

    • one year ago
  11. jim_thompson5910
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    there's a big difference between A and D though

    • one year ago
  12. KonradZuse
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    some similarities... Because the score isn't 115, but the average of freshman is different from the overall.

    • one year ago
  13. KonradZuse
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    A seems more logical as an answer tho :P

    • one year ago
  14. jim_thompson5910
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    the big difference is that A says you can conclude it's not H0, D says you've proven it's not H0 technically, rejecting H0 does NOT mean you've fully proven it's not H0 since you could have made a type I error if this happens

    • one year ago
  15. KonradZuse
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    so it's D? weak.

    • one year ago
  16. jim_thompson5910
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    no i didn't say it was D

    • one year ago
  17. KonradZuse
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    oh...

    • one year ago
  18. jim_thompson5910
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    I'm saying D is not possible because you can't fully prove/disprove it since a type I error might occur

    • one year ago
  19. KonradZuse
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    my brain hurts.

    • one year ago
  20. KonradZuse
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    ic...

    • one year ago
  21. KonradZuse
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    SO A!

    • one year ago
  22. KonradZuse
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    hehehe. I'm soo gewd.

    • one year ago
  23. jim_thompson5910
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    yep

    • one year ago
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