Sta 2381 - Study guides, Class notes & Summaries

Hypothesis Statements are made about: - correct answer Population parameters Type I Error - correct answer Rejecting null hypothesis when it is true Probability of Type I Error - correct answer alpha Type II Error - correct answer failing to reject a false null hypothesis Probability of Type II Erro...

If we find that the differences between the sample mean is a rare event, we will conclude that - correct answer The null hypothesis is rejected For a study that contains 2 groups with a total of 18 participants, how many degrees of freedom are there for a dependent means t-test? - correct answer 17 (subtract 1 from the number) T or F- If the standard error of the difference between two samples is ...

What is the goal of hypothesis testing? - correct answer to test a hypothesis regarding a single mean ______________ is always located in the null hypothesis and the hypotheses are always in terms of the _________________. - correct answer Equality; parameters What are the three choices for the alternative hypothesis? - correct answer 1. u > u_o 2...

multiplication rule - correct answer the number of ways to complete an operation is the product of the number of ways to complete each step permutation - correct answer an ordered sequence of the elements combination - correct answer a subset of r elements that can be selected from n elements where order doesn't matter probability of an event in a...

mean for discrete random variables - correct answer ∑xP(x) variance for discrete random variables - correct answer ∑(x-µ)²P(x) exact probability for binomial distribution - correct answer ((n!)/((n-x)!x!))*p^x*q^(x-n) mean for binomial distribution - correct answer np variance for binomial dis...

Retrospective Study - correct answer A retrospective study gathers historical data through records. The outcomes have already occurred before the study Observational Study - correct answer A type of study in which individuals are observed or certain outcomes are measured. No attempt is made to affect the outcome. Designed Experiment - correct answer I...

classical definition of probability - correct answer P({E}) = (# of outcomes in the event)/(# of outcomes in the sample space) = n(E)/n(S) probability of complement - correct answer P(E) = 1 - P(E^-1) P(A ∪ B) if A and B are mutually exclusive - correct answer P(A ∪ B) = P(A) + P(B) in general P(A ∪ B) if A and B are NOT mutually exclusive - ...