The following data show the number of defects in 100,000 lines of code in a particular type of software program made in the United States and Japan. Is there enough evidence to claim that there is a significant difference between the programs of the two countries? Test on means. Should variances bepooled?

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40 48 52 52 54 48 52 55 43 46 48 52 Japan 50 48 42 40 43 48 50 46 38 38 36 40 40 48 48 45 48 39 42 52 U.S.