# type 1 error

1. ### Why is chance of a Type 1 error equal to alpha?

Hi all: First post on here, so hope it's not too incoherent. Most sources I've looked at in trying to learn about statistics and probability talk about Type 1 errors as cases where we falsely attribute significance and state that the chance of this is the alpha value we decide when...
2. ### conditional probability of type 1 error - hypothesis testing common malpractices

If you want to test Ho = 0 versus H1≠ 1,with significance level alpha, but instead of testing this directly, you have a strategy: -> X1,...,Xn is a random sample from a N(µ,σ2) distribution with σ2 known (I shall denote the mean of X as X(m)) and we obtain Z = X(m)/(σ/√n) If Z > 0, let H1 : µ >...
3. ### Quick Question on Hypothesis Testing

Let's say you test hypothesis at alpha=.05, does that mean that 5% of your rejections will be wrong? Is this statement true? If not, can you give an example? I know that alpha= P(type 1 error), which is the probability of rejecting given Null is true. But I still can't tell whether that...
4. ### Confusing Power of T Test!

Hey all, This is my first post to this site. My question is: I am using this (given) regression to find the relationship between gender and wage: Lnwage = Beta0 + Beta1male + Beta2Professional + Beta3Management + Beta4Educ + u My professor wants me to test the power of the test with...
5. ### Controlling for Type 1 Errors: Post-hoc testing on more than 1 ANOVA

I have conducted several repeated-measures ANOVA's with post-hoc testing via Tukey's HSD whenever the omnibus F-test was significant. I'm having some confusion about controlling for type 1 errors when presenting these post hoc tests. Q1: It's my understanding that Tukey's HSD will control the...
6. ### Using factor analysis to avoid Bonferroni death?

Hi! I have a study with three dichotomous IVs and five DVs, which are brief, relatively reliable composite scales derived through factor analysis. If I run 2x2x2 ANOVAs for each of the individual subscales, I get great results, with interactions supporting my hypothesis. However, if I use a...