Consider the following results for independent random samples taken from two populations.

Sample 1 Sample 2

n 1 = 10 n 2 = 30

x 1 = 22.3 x 2 = 20.1

s 1 = 2.7 s 2 = 4.9

What is the point estimate of the difference between the two population means (to 1 decimal)?

What is the degrees of freedom for the t distribution (round down your answer to nearest whole number)?

At 95% confidence, what is the margin of error (to 1 decimal)?

What is the 95% confidence interval for the difference between the two population means (to 1 decimal)? If your answer is negative value, entre minus (-) sign. Use z-table.

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