G A Research and Development Department measured the tensile strength of aluminum wire made under all combinations of 3 levels of the amount of magnesium (0, 1 and 2%) and 2 levels of type of fabrication (rolled and annealed). Three specimens were fabricated for each treatment combination and the following tensile strength were obtained in psi: Percent of Magnesium Fabrication Rolled 178 214 306 182 201 321 223 310 Annealed 65 | 104 146 52 1171 59 126 159 What assumptions are required for a valid Test of hypothises? 1. Magnesium content normally distributed with constant variance and random samples. 2. Tensile strength normally distributed with constant variance and nonrandom samples. 3. Tensile strength normally distributed with constant variance and random samples. 4. All other choices are correct. QUESTION 2 Does magnesium content affects the tensile strength of aluminum wire? State the null hypothesis this question. 1. The amount of magnesium content affects the tensile strength of aluminum wire. 2. Tensile strength of wire does not affect the magnesium content 3. Tensile strength of wire affects the magnesium content 4. The amount of magnesium content doe not affect the tensile strength of aluminum wire.