Exercise 10.09 Algo (Inferences About the Difference Between Two Population Means: Sigmas Unknown) Question 9 of 13 Consider the following results for independent random samples taken from two populations. Sample 1 Sample 2 ni = 10 12 = 30 #1 =22.6 22 = 20.7 $1 = 2.5 82 = 4.4 a. What is the point estimate of the difference between the two population means (to 1 decimal)? b. What is the degrees of freedom for the t distribution (round the answer to the previous whole number)? c. At 95% confidence, what is the margin of error (to 1 decimal)? d. What is the 95% confidence interval for the difference between the two population means (to 1 decimal and enter negative value as negative number)? 0Icon Key