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KonradZuse

  • 2 years ago

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.

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  1. KonradZuse
    • 2 years ago
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    @jim_thompson5910

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

  3. jim_thompson5910
    • 2 years ago
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    lol that might help...

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

  5. jim_thompson5910
    • 2 years ago
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    we did

  6. jim_thompson5910
    • 2 years ago
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    well sorta

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

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

  9. KonradZuse
    • 2 years ago
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    sorry was chatting business with Dad.

  10. KonradZuse
    • 2 years ago
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    @jim_thompson5910

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

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

  13. KonradZuse
    • 2 years ago
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    A seems more logical as an answer tho :P

  14. jim_thompson5910
    • 2 years ago
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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

  15. KonradZuse
    • 2 years ago
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    so it's D? weak.

  16. jim_thompson5910
    • 2 years ago
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    no i didn't say it was D

  17. KonradZuse
    • 2 years ago
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    oh...

  18. jim_thompson5910
    • 2 years ago
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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

  19. KonradZuse
    • 2 years ago
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    my brain hurts.

  20. KonradZuse
    • 2 years ago
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    ic...

  21. KonradZuse
    • 2 years ago
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    SO A!

  22. KonradZuse
    • 2 years ago
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    hehehe. I'm soo gewd.

  23. jim_thompson5910
    • 2 years ago
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    yep

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