A nutrition researcher wants to determine the mean fat content of hen’s eggs. She collects a sample of 40 eggs. SHe calculates a mean fat content of 23 grams, with a sample standard deviation of 8 grams. From these statistics she calculates a 90% confidence interval of [20.9 grams, 25.1 grams]. What can the researcher do to decrease the width of the confidence interval?

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