# Question

Independent random samples from two normally distributed populations give the following results:

nx = 15 x-bar = 400 sx = 10

ny = 13 y-bar = 360 sy = 40

If we do not assume that the unknown population variances are equal, what is the 90% confidence interval for the difference between population means?

nx = 15 x-bar = 400 sx = 10

ny = 13 y-bar = 360 sy = 40

If we do not assume that the unknown population variances are equal, what is the 90% confidence interval for the difference between population means?

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