Question

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

Answer 1

we can conclude that it appears plausible that the tension distribution is normal since the sample of 30 readings is taken.

Explanation:

We are given that 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.

According to Central Limit Theorem we can have a normal distribution if we take a large sample.

So the question is how much sample size do we need?

The rule of thumb is to take a sample size of at least 30 to ensure a normal distribution.

Therefore, we can conclude that it appears plausible that the tension distribution is normal since the sample of 30 readings is taken.