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In order to estimate 90% confidence interval for difference between two population means: Two samples are taken. First sample has 10 observations with sample mean

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In order to estimate 90% confidence interval for difference between two population means: Two samples are taken. First sample has 10 observations with sample mean 7.5 and sample variance 2.5. Second sample has 12 observations with sample mean 9.6 and sample variance 1.5, How many degree of freedom the critical value t_alpha/2 has? 20 22 10 25 0 5 Page 7 of 21

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