A company produces iron balls for industrial uses so that the average diameter of balls is 50 cm. The company quality control manager wants to check if the production is as per the specification. He took a sample of 10 balls and measured the diameters and the results in centimeters are shown below: 48, 50, 49, 52, 53, 48, 49, 47, 46, 51 Assuming that the diameter of the balls follow normal distribution, can we conclude at 5% level of significance that the mean diameter is not 50 cm?