A car manufacturer operates 24 hours using two shifts, day and night shifts. The manufactured cars sometimes have defects. Random samples of cars manufactured during the two shifts were collected and examined for defects.   shift day night sample size 500 800 defective in the sample size 15 21 Test the hypothesis that there is no significance difference in the number of  defects between day and night shifts at the 5% level of significance.

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Q: O8750 O2916.67 O 7600 O 16350 IS

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