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You may need to use the appropriate appendix table or technology to answer this question. The following results are for independent random samples taken from two populations. Sample 1 Sample 2 n1=20 n2=30 (a) What is the point estimate of the difference between the two population means? (Use )7 x2.) 1 (b) What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.) _x (c) At 95% confidence, what is the margin of error? (Round your answer to one decimal place.) (d) What is the 95% confidence interval for the difference between the two population means? (Use :(1 Q2. Round your answers to one decimal place.) ..,_