Shea wants to estimate the difference between two population means and plans to use data collected from two independent simple random samples of sizes n₁ = 30 and n₂ = 35. She does not know the population standard deviations, so she plans to construct a two-sample t-confidence interval for the difference in the two means. Use a t-distribution table to determine the positive t-critical value needed to construct a 99% confidence interval using a conservative estimate of the number of degrees of freedom. Enter the positive critical value precise to three decimal places. t =

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