Can someone me with this 2 other questions

4. IV: Distance ball goes, DV: Type of bat, C: Type of ball, and the length of the experiment (6 weeks).
Hypothesis: If the player uses the aluminum bat, then it will have a greater distance then the balls hit with the wooden bat.

5. IV: Light produced, DV: Light Bulb wattage. C: The lamp
Hypothesis: If the bulb has more energy yen it will produce more light.

IV is what you don't control/the outcome of the experiment, and DV is the part of the experiment that you have control over. The constant remains the same throughout the experiment.

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.