Binomial or Normal: Population Proportion Testing

[werson9339]

Homework Statement

This involve testing population proportion. (either small or big sample) this question is done by my lecturer by using binomial , i am wondering could it be done using normal distribution? because the np is 20(0.45) = 9 which is greater than 5 , https://www.flickr.com/photos/110120...6/15432962168

Homework Equations

The Attempt at a Solution

 

[Ray Vickson]

Homework Statement

This involve testing population proportion. (either small or big sample) this question is done by my lecturer by using binomial , i am wondering could it be done using normal distribution? because the np is 20(0.45) = 9 which is greater than 5 , https://www.flickr.com/photos/110120...6/15432962168

Homework Equations

The Attempt at a Solution

Post the problem by typing it directly; I cannot open your link---I get a bad link message. Anyway, there are good reasons for NOT posting images; it is discouraged (although not outright forbidden) by PF. Read the pinned post 'Guidelines for students and helpers', by Vela.