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It is claimed that the weight of biscuits produced in a bakery is normally distributed with mean 44 g. In order to test this, a sample of 21 biscuits are taken and it is found that the mean is 42g and standard deviation 6g. Is there evidence at the 5% level to say that the claim is wrong?

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Which one is the correct null hypothesis?

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Which one is the correct alternative hypothesis?

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Write down the number of degrees of freedom.

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Write down the absolute value of critical value.

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Calculate the test statistics in 2 decimal places.

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What is the decision?

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