The food and beverage director for Raley Field conducts a study to find the amount spent on concessions at the stadium. Over the course of the season, he gathers simple random samples of 500 men and 1000 women. Assume that the samples are independent. The average expenditure for the sample of men was $20, with a standard deviation of $3. For women, the average was $15, with a standard deviation of $2.

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Please answer: t-critical value: t_/2