A spice box manufacturing company is having difficulty filling packets to the required 50 grams. Suppose a business researcher randomly selects 60 boxes, weighs each ofthem and computes its mean. By chance, the researcher selects packets that have been filled adequately and that is how he gets the mean weight of 50 g, which falls in the "fail to reject" region. The decision is to fail to reject the null hypothesis even though population mean is NOT actually 50 g. Which kind of error has the researcher done in this case