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Chapter 9&15 (Chapter 9 Vocabulary (estimated standard error, degrees…
Chapter 9&15
Chapter 9 Vocabulary
estimated standard error
degrees of freedom
t distribution
Steps for a hypothesis test on t statistic
1) state the hypothesis (find the null and alternative)'
2)locate the critical region
3) calculate the results
4) state the conclusion
Chapter 15 Vocabulary
correlation ( measures the relationship between two variables)
positive correlation (variables changing in the same direction)
negative correlation (when the (y) value increases the (x) value increases visa-versa)
Sum of products
can be calculated by 2 formulas, the definitional and computational
relationship is described by 3 characteristics
Direction, form, strength
The t statistic is used to test the hypothesis about a unknown population mean
The t statistic is used instead of the z score
t statistic cant be used for small sample sizes may give poor results