Sunspots are dark areas on the surface the Sun.They mark strong magnetic fields, and more sunspots indicate that the Sun is more
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The null hypothesis: the mean egg thickness is 0.2 mm
The alternative hypothesis: the mean egg thickness is less than 0.2 mm
In statistics, the null hypothesis states that there is no significant difference between the observed value and the mean thickness. The alternative hypothesis states is the opposite and states the scientist's "idea" behind the experiment. Here, it refers to the fact that due to DDT, the egg shell will be thinner compared to the mean value.