proportions Flashcards
what are the assumptions for a one sample Test for proportions
np>10 and n(1-p)>10 so that the normal approximation applies . also indpedence and good sampling
what is the hypo for a one sample Test for proportions
p=po
where does the p value come from in a One sample Test for proportions
Since we’re not estimating the standard deviation, we don’t get a t
distribution. The p-value comes from the normal distribution.
what does a CI interval look like in a one sample Test for proportions
For a CI, we don’t have a hypothesis and so we use p hat
in the standard error.
what is P hat
in hypotesting P hat is the pooled proportion
assumptions for a Two sample Test for proportions
n1phat >10 and n1(1-phat)>10 this also aplies to n2
so same as a one sample just for both samples using phat which is a pooled proportion
what is the general hypo for a two sample test for proportions
that pdiff=0
or that lets sau we want to determine if p2 is 10 percentages higher the p1 in which we would say pdiff = 0.10
when p value is larger then significance level we what
do not reject the null
what are the assumtions of a chi square test for 2-way tables?
independence among indiduals, and large enough samples for the normal approximation to apply
what are the hypos for the Chi-square test for 2 way tables
The column and row variables are independent
P(A|X) = P(A) for rows A and column X and vise versa
what is the test statistic for Chi-square test for 2 way tables
the squared diff between the obersed cound ad the expected count
(remeber the expected count is what we would get if the rows and columns were independent)(obervsered count is what we acc got)
what is the P vaule in a chi-square test for 2 way tables?
always right tailed since the test stat is the squared diffrence
