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Exam (elaborations)

STA 261 exam 3 with correct solutions

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  • STA 261
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  • STA 261

STA 261 exam 3 with correct solutions

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  • February 16, 2024
  • 4
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
  • STA 261
  • STA 261
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Fordenken
STA 261 Exam 3
Confidence Interval (CI) - abswer; roughly speaking, the range of scores (that is, the scores between an upper and lower value) that is likely to include the true population mean; more precisely, the range of possible population means from which it is not highly unlikely that you could have obtained your sample mean
Confidence Interval interpretation - abswer; We can say with x% confidence that the parameter of interest lies within the interval
independent sample - abswer; a type of sample in which different participants are independently observed one time in each group
dependent sample - abswer; Sample whose values are related to the values in another sample (must use
paired procedure)
Bootstrapping - abswer; sampling is conducted with replacement, sample size is the same size as the original sample, only members of the original sample are included in the sample
one mean t-test - abswer; randomized data, appox. normal or large enough to ensure normality by the CLT. T-distribution is the test stat value- also most use DF. (T-stat on statcrunch)
one proportion z-test - abswer; randomized data, large enough sample size (at least 15 successes and at least 15 failures). z-distribution is the test stat value. (Proportion stats on statcrunch)
p-value - abswer; The probability of observing a test statistic as extreme as, or more extreme than, the statistic obtained from a sample, under the assumption that the null hypothesis is true.
Interpretation of P value - abswer; reject the null hypothesis if our p-value is less than or equal to the significance level. Otherwise, we fail to reject the null hypothesis.

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