* For large samples one sample t-tests (n >120) use critical t scores of ±1.96 (for...

* For large samples one sample t-tests (n >120) use critical t scores of ±1.96 (for 95% confidence level two tailed test) or ±1.65 (for 95% confidence level one tailed test).

* For small samples (n<120) use critical t score obtained from t-distribution table. You will need to calculate degrees of freedom, which is simply the sample size minus 1 (df = n-1) and use an alpha value of .05.

* For comparing means between two samples (regardless of sample sizes), use an independent samples t-test, with a critical t of ±1.96.

Students at Claremore High School cut an average of 3.3 classes per month. A random sample of 125 seniors averages 3.8 cuts per month, with a standard deviation of 0.53. Are seniors significantly more likely to cut class than the student body as a whole? What is your estimate for the population mean number of classes cut per month by all seniors?

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orchestra answered 2 years ago

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