Anova Single Factor Summary Groups Diastolic 2 Grp 1 Diastolic 2 Grp2 Diastolic

Hi,

I’m new to this site and normally do my homework on my own but this is really a difficult class. Please refer to the Sign Test tab in the assignment spreadsheet (attached). The table that I am looking at only goes up to n=25, how do I get the critical value if the n>25? I want to know the process, can you explain? Thank you.

Question: For alpha of 0.05 two sided Test the Critical Value =  ?