Q114. What's the definition of the p-value and what is it used for? Ans: validate null hypothesis INFO all true: A p value is used in hypothesis testing to help you support or reject the null hypothesis is the probability that, if the null hypothesis were True, sampling variation would produce an estimate that is further away from the hypothesised value than our data estimate. It tells us how likely it is to get a result like this if the null hypothesis is True The P-value is "the probability" for the "Null Hypothesis" to be True P>0.05 is the probability that the null hypothesis is true. The null hypothesis is the one to be tested and the alternative is everything else. Q278. If a device has a probability to fail due to electrical failure of p1=0.01, and another probability to fail due to another thing of p2=0.02. what is the probability if any of the two events occur? a. 0.01 b. 0.002 0.03 C. d. 0.02