A physician is interested to determine if the mean length of waiting time to conceive (in months) of married women in urban and rural areas is the same. She randomly selected 10 married women in each...

A physician is interested to determine if the mean length of waiting time to conceive (in months) of married women in urban and rural areas is the same. She randomly selected 10 married women in each area matched according to age at marriage and party. The length of waiting time to conceive since data of marriage or date of last birth delivery was recorded. What type of sample was used? - independent - objective - related - subjective