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# statistics T DISTRIBUTION Watch

1. I AM ASKED TO CALCULATE THE CONFIDENCE INTERVAL, THE SAMPLE SIZE IS 7 BUT THE POPULATION SIZE IS IN THE THOUSANDS. I AM NOT GIVEN ANY STANDARD DEVIATION ALL I HAVE IS n, N and TO CALCULATE 99% CONFIDENCE INTERVAL. DO I USE Z OR T? I AM SO CONFUSED
2. I am rusty in stats but if I remember well you use t-distribution if population is normal, sample size is small and variance of population is unknown (has to be estimated from the sample)
3. (Original post by TeeEm)
I am rusty in stats but if I remember well you use t-distribution if population is normal, sample size is small and variance of population is unknown (has to be estimated from the sample)
thankyouuuu
4. no worries
5. (Original post by TeeEm)
I am rusty in stats but if I remember well you use t-distribution if population is normal, sample size is small and variance of population is unknown (has to be estimated from the sample)
This is correct.
6. (Original post by rayquaza17)
This is correct.
what if i am not given the significance
7. Test at 5%. If you do not reject here, then you must not reject at a lower percentage. If you do reject, repeat with 1% then 0.1%

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8. (Original post by rayquaza17)
test at 5%. If you do not reject here, then you must not reject at a lower percentage. If you do reject, repeat with 1% then 0.1%

posted from tsr mobile
you are the best

so it does not matter that i was not given any percentage?
9. (Original post by rayquaza17)
Test at 5%. If you do not reject here, then you must not reject at a lower percentage. If you do reject, repeat with 1% then 0.1%

Posted from TSR Mobile
when u say 5% do you mean siginificance level of 0.05? my problem is q=1-significance level. when looking at the t table it seems that my hypothesis 0 can be rejected at a lower significance level
10. Yes 5% is the same as 0.05.

If it can be rejected at a lower significance level, then test it at that level level as well.

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Updated: January 12, 2015
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