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Answer:
Answer is 28
Step-by-step explanation:
Given that a researcher selects a sample of 100 people to investigate the relationship between gender (male/female) and registering to vote.
The information given with two variables as gender and another variable as registered or non registered can be tabulated as follows:
Females Males Total
Registered 30 40 70
Non regd. 10 20 30
Total 40 60 100
For chi square test of independence we assumed that the two variables are independent.
Hence expected frequency = row total* column total/grand total
For registered females row total = 40 and column total = 70
So expected frequency for regd females =