It is known that the average weight of the products produced in a factory is 150 grams. The shape of the population is normal, but the population variance is unknown. 16 products were randomly drawn from the production line. The mean of this sample mass was 145 grams and its standard deviation was 4 grams. Test the claim of the researcher that the mean weight of the products produced in the factory is different from 150 grams at a significance level of 0.05.

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