A contingency table for a certain experiment is shown below

A contingency table for a certain experiment is shown below. The excepted values for independence are shown in () while the other values represent the observed values. Find the miming expected value denoted by x. In regression analysis what does the variable b_0 represent?

Solution

expected value for that value is

40+47 = 87

127+40+50+57= 274

total = 274 + 71+47+43+42 =477

expected value = (87*274) / 477 = 49.97