A machine produces ball bearings is set so that the average diameter is .50 inch. A sample of 10 ball bearings was measured with the results shown here. Assuming that the standard deviation is .05 inch, can we conclude at the 5% significance level that the mean of the diameter is not .5 inch? .48 .50 .49 .52 .53 .48 .49 .47 .46 .51