2551494
Description
Flashcards by Joseph Stevens, updated more than 1 year ago
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Created by Joseph Stevens
over 9 years ago
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| Question | Answer |
| Hypothesis testing Give the null hypothesis in terms of μ and k | μ = k |
| Give the 3 different new hypotheses | If changed: μ≠k If increased: μ>k If decreased: μ<k |
| Null hypothesis is rejected if z... | Does not lie in the critical region |
| What is a type I error | When a true null hypothesis is incorrectly rejected |
| A type II error is the acception of a false null hypothesis, True or False. | True |
| Poisson distribution Give the general notation of a poisson distribution | P~(λ) |
| What does λ represent | mean |
| State the conditions for poisson distibution to be an appropriate model | Data is random Mean is approximately equal to the varience |
| Student's-t distribution State the condition on the sample size(n) for a t distribution to be required | n<30 |
| What is the degrees of freedom(v) in t distribution | v=n-1 |
| List the steps to get a t-dist confidence inteval | 1. Work out mean 2. Work out standard deviation if not given 3. Work out standard error 4. Find value of t_v 5. Work out and state upper and lower bounds confidence inteval |
| Chi squared distribution State the formular of the test statistic | |
| What is the condition for this test stat formular | degrees of freedom = 1 |
| State the value of the degrees of freedom | (numbor of rows-1)*(number of columns-1) |
| Give steps of the chi distibution hypothesis test | 1. State H0 & H1 2. State degrees of freedom 3. Write critical value from table in formular book 4. Write expected table 5. Write test statistic 6. Give appropriate inequality 7. Reject/Acept H0 accordingly |
| Continuous distribution If X = aY+b, find E(X) & Var(Y) | E(X) = aE(X)+b Var(X) = a^2 Var(X) |
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