Correct option is B
· A null hypothesis (H₀) states that there is no effect or no difference between groups.
· It serves as the starting assumption in statistical testing.
· For example: "Fertilizer A has no effect on yield compared to Fertilizer B."
· The aim is to test this assumption against an alternative hypothesis (H₁).
· A significant result leads to rejection of the null hypothesis.
when the population standard deviation is known, the appropriate test is: