How will demonstrate that your experimental data are affected by only random errors?…

Answer the following briefly

a. How will demonstrate that your experimental data are affected by only random errors?

b. If a hypothesis is rejected at a particular significance level, can it be accepted at a higher level of significance? When increasing the level of significance, is the confidence interval becoming broader or narrower?

c. Find the degrees of freedom (dof) in T-distribution such that P(Z>2.086404)=P(Tdof>2.5). Why is the value corresponding to the T-distribution higher than the Z value?

 
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