4. In a spelling contest, the mean mark of the 32 boys was 72 with the standard deviation of 8 while the mean mark of 36 girls was 75 with a standard deviation of 6. Test at α=0.05 that there is significant difference between the performance of boys and girls in the spelling contest. Ho = Ha =  Level of significance

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Q: For a standardized normal distribution, calculate the probabilities below. a. P(z< 1.8) b. P(z 2…

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