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- Concept Video2:13Introduction to Statistics Channel1. Intro to Stats and Collecting Data / Intro to Stats
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Practice problemYou collect the test scores of every other student in a class. Is this data set a population or sample?
1. Intro to Stats and Collecting Data / Intro to Stats
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- RN@RobertUpdate 9 hours ago
Hi there!
Have you Checked Probabilities & Z-Scores w/ Graphing Calculator.
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- RN@RobertUpdate 9 hours ago
Hi there! I don't get the issue.
n/2 = 76/2 = 38 and np = 0.372 × 76 = 28.272
I don't a calculator error either.
Please check the algebra - you may bracket numerator.
0up votes•0replies - RN@RobertUpdate 9 hours ago
Hi there! Nice questions.
1. We have two methods of H-testing. Using alpha (0.01, 0.05, 0.1) and using critical value (z and t scores). Reject H0 if p-val < alpha or z/t score > critical value. Since we compare p-val to alpha, we can't make a decision (rejection or not) without p-val. We can also convert alpha to z/t scores (called critical value) then use z/t score > critical value for rejection. No, alpha is a reference value, we need a p-val.
2. 80%, 90%, 95%, and 99% may give different results. For example, 0.0228 < 0.05 and 0.0228 > 0.01. At 95% we reject h0, at 99% we can't reject H0.
1 and 2 applies to H tests.
3. Are talking about H-test or Confidence interval? Check our section on confidence interval (Here we cover H test only). I guess your question covers difference in means/proportions (keep checking it is almost being released), Reject H0 if interval excludes zero. If interval includes zero, it is possible (mean 1 = mean 2), so we fail to reject null hypothesis.
I hope this helps.
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