Trader Joes sells various flavors of individual servings of

Trader Joe\'s sells various flavors of individual servings of yogurt

Yoplait: 34%

Chobani: 21%

Trader Joe\'s: 37%

Dannon: 8%

Compute the standard error of the proportion for the random sample size of 269 receipts indicating Yoplait yogurt purchases selected from Trader Joe\'s electronic journal.

Please show work.

Solution

Here,          
n =    269      
p =    0.34      

hence,
          
s(p^) = standard error of proportion = sqrt(p(1-p)/n) = sqrt(0.34*(1-0.34)/269) = 0.028882534   [ANSWER]