Amphetamine is a drug that suppresses appetite in most animals. To study the magnitude of this effect in rats a scientist randomly assigned thirty rats into three treatment groups to receive either a dose of amphetamine (2.5 or 5.0 mg/kg) or a control (saline, 0 mg/kg). Then food consumption was measured in grams per kilogram of body weight (g/kg) for the three-hour period after the injection. A) Which of the choices on Canvas best represents the null/alternative hypothesis of this study?

µ1 = µ2

µ1 ≠ µ2

µ1 > µ2

µ1 < µ2

µ1 ≥ µ2

µ1 ≤ µ2

θ1 = θ2

θ1 ≠ θ2

θ1 > θ2

θ1 < θ2

θ1 ≥ θ2

θ1 ≤ θ2

ρ = 0

ρ ≠ 0

β = 0

β ≠ 0

The residuals of these data are consistent with a normal distribution.

These residuals of these data are not consistent with a normal distribution.

The variances of the response/residuals are the same for all values of x.

The variances of the response/residuals are not the same for all values of x.