I need advice on how to analyze a simple set of data. For simplicity's sake I'll make up the variables.

Question: A store keeps track of the proportion of males vs. females that visit its store every day. On Saturday, the proportion of men and women visiting is 0.5 and 0.5. On Sunday, it is 0.7 men and 0.3 women.

If this is pertinent, let's say that 400 visited on Saturday and 300 visited on Sunday, So that breaks down to, Saturday: 200 men and 200 women. On Sunday, 210 men and 90 women.

Is the difference between the two days significant?

What would be the appropriate test to use to analyze this?

Thanks!