Suppose a study is conducted comparing the level of Strontium-90 exposure in two different cities. Measurement levels (in millibecquerels per gram of calcium, or mBq/g) are extracted using two independent simple random samples of baby teeth obtained from randomly selected residents of the two cities. Assume the measurements are approximately normally distributed. If the Strontium-90 levels for City 1 are defined as Population 1 and the levels for City 2 are defined as Population 2, what are the symbolic forms of the null and alternative hypotheses needed to test the claim that the mean amount of Strontium-90 collected from City 1 residents' teeth is greater than the mean amount collected from the residents of City 2?

Suppose a study is conducted comparing the level of Strontium-90 exposure in two different cities. Measurement levels (in millibecquerels per gram of calcium, or mBq/g) are extracted using two independent simple random samples of baby teeth obtained from randomly selected residents of the two cities. Assume the measurements are approximately normally distributed. If the Strontium-90 levels for City 1 are defined as Population 1 and the levels for City 2 are defined as Population 2, what are the symbolic forms of the null and alternative hypotheses needed to test the claim that the mean amount of Strontium-90 collected from City 1 residents' teeth is greater than the mean amount collected from the residents of City 2?

H₀ : ₁ - ₂ = 0 H_A : ₁ - ₂ 0

H₀ : ₁ - ₂ = 0 H_A : ₁ - ₂ > 0

H₀ : ₁ - ₂ 0 H_A : ₁ - ₂ > 0

H₀ : ₁ - ₂ 0 H_A : ₁ - ₂ > 0