The following information about the regression coefficients

The following information about the regression coefficients is also reported which of the four independent variables is significantly related to the dependent variable? That is which of the four independent variables should we retain in the regression equation? Assume (x = 0.05 please check the appropriate box \'yes\' or no for each variables. A quality control inspector is always on the lookout for substandard parts and components provided to her manufacturing company by outside suppliers because most shipments contain some defective Items, each must be subjected to inspection. Naturally, some shipments contain more defectives than others, and it is the job of the Inspector to Identity the most defective-laden shipments so that they can be returned to the supplier. Suppose the Inspector selects a sample of n = 72 Items from a given shipment for testing. Suppose also that, unknown to the Inspector, this particular shipment Includes 9% defective components. If the policy is to return any shipment with at least 5% defectives, what is the probability that this particular shipment (with 9% detectives) will be accepted as good any way 0.0870 0.1170 0.1470 0.1770 0.2070

Solution

8.

We first get the z score for the critical value. As z = (x - u) / s, then as          
          
x = critical value =    0.05      
u = mean = p =    0.09      
          
s = standard deviation = sqrt(p(1-p)/n) =    0.033726844      
          
Thus,          
          
z = (x - u) / s =    -1.19      
          
Thus, using a table/technology, the left tailed area of this is          
          
P(z <   -1.19   ) =    0.117023196 = 0.1170   [ANSWER, B]