(b) is the following argument valid? "if you elect me as the us president, i will build a wall between the us and mexico. if there is a wall between the us and mexico, there will be no illegal immigration from that country. if we do not stop illegal immigration from mexico, there will be no job left for americans. if americans have jobs, america will be great again. so, if you elect the us president, america will be great again."

The accompanying normal probability plot was constructed from a sample of 30 readings on tension for mesh screens behind the surface of video display tubes used in computer monitors. does it appear plausible that the tension distribution is normal? the given probability is has a significant downward curve, so it is plausible that the tension distribution is normal. the given probability is has a significant downward curve, so it is not plausible that the tension distribution is normal. the given probability is quite linear, so it is plausible that the tension distribution is normal. the given probability is has a significant upward curve, so it is not plausible that the tension distribution is normal. the given probability is quite linear, so it is not plausible that the tension distribution is normal.