When certain quantities are measured, the last digits tend to be uniformly distributed, but if they are estimated or reported, the last digits tend to have disproportionately more Os or 5s. If we use the last digits (decimal portion) of the 80 weights in Data Set 1 from Appendix B, we get the frequency counts in the table below. Use a 0.05 significance level to test the claim that the last digits of 0, 1,2, . . . , 9 occur with the same frequency. Does it appear that the weights were obtained through measurements?

Last Digit01 23 45 6 7 89 Frequency 67 4 10 8 5 9 10 10