An experiment was designed to see whether laboratory rats would, on average, eat more when confined to a crowded cage or an uncrowded one. To minimize the effect of genetic differences, two rats were chosen from each of 30 litters. One of each pair of rats was randomly assigned to a crowded cage, the other rat to an uncrowded cage. The data to be collected were the 30 differences in the amount of food consumed between the "crowded" and the "uncrowded" rat from each litter.

What is the natural null hypothesis for this experiment?

?If so, which direction should be chosen?

Null hypothesis: μ₁ = μ₂.

Alternate hypothesis: μ₁ > μ₂.

Step-by-step explanation:

The experimenter want to see whether laboratory rats would, on average, eat more when confined to a crowded cage or an uncrowded one.

(1)

The null hypothesis for this test is defined as:

H₀: The rats would, on average, not eat more when confined to a crowded cage or an uncrowded one, i.e. μ₁ = μ₂.

(2)

The alternate hypothesis will be directional. This is because the experimenter wants to determine whether the rats eat more or not.

So the alternate hypothesis is:

Hₐ: The rats would, on average, eat more when confined to a crowded cage or an uncrowded one, i.e. μ₁ > μ₂.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

answer: the answer is b. i think hope i got it correct

step-by-step explanation: