Inference about Means
SE(bar y) = ?
What is s/sqrt(n) ?
sum_(AllCells)((Obs - Exp)^2)/(Exp)
How do you find chi^2 ?
Conclusion if the P-value from a two-sample t-test is 0.3
What is "we do not reject the null hypothesis that the two means are the same" ?
Inventor of the Student's t distribution
Who is William Gosset?
(Rows - 1)(Columns - 1)
How do you calculate degrees of freedom?
t* x SE (bar (y_1)-bar (y_2))
What is the margin of error for a two-sample t-test?
bar y +- (t_(n-1)) (SE(bar y))
What is a confidence interval for the mean bar y ?
What a P-value of 0.02 in a test of homogeneity indicates
What is "the categories are not homogeneous" ?
((bar (y_1)-bar(y_2))-Delta_0)/(SE(bar (y_1)-bar(y_2)))
What is the formula for the t statistic for a two-sample t-test?
When the Student's t model approaches the Normal model
What is "as the sample size increases" ?
What a large X^2 value generally indicates about the P-value
What is a small P-value?
sqrt(s_1^2/n_1+s_2^2/n_2
What is SE(bar(y_1)-bar(y_2)) ?
(bar y-mu)/(SE(bar y))
What is the t-statistic t_(n-1) ?
chi^2 = 10 in a test of independence. You also need to know this in order to calculate a P-value.
What is "degrees of freedom" ?
(bar(y_1)-bar(y_2))+- (t_(df)) (SE(bar(y_1)-bar(y_2)))
What is the formula for a confidence interval for the difference between two means?