how many marbles for a single sample? how to estimate the proportion of black and white marble is it invalid to use a single sample to estimate more than one proportion? can you use a single sampling when using a single sample to estimate a proportion, does it really need to be more than one? how to figure the difference of a marble in a color when to use single sample to estimate proportion of color how to estimate proportion of different colours can you use a single sample to figure out the proportion of black marbles? how to estimate the proportion of each colour using the standard error of the proportion formula what is the margin of error for using a single sample can you estimate the proportion of each colour how many marbles are in a jar of black marbles can you use a single sample to estimate more than one proportion how to use a single sample to estimate the proportions for each colour? what is the margin of error on a sample how do you find your % ratio why is it invalid to measure more than one proportion? how many marbles are in a black and white marble jar which is the correct formula for the error of the standard error for estimating a proportion?