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You may need to use the appropriate appendix table or technology to answer this question. The following results come from two independent random samples taken of two populations. Sample 1 Sample 2 n = 50 n2 = 25 x = 13.6 X2 = 11.6 01 = 2.2 02 = 3 (a) What is the point estimate of the difference between the two population means? (Use x, - x,.) 2 (b) Provide a 90% confidence interval for the difference between the two population means. (Use x, - X,. Round your answers to two decimal places.) 1.04 x to 2,96 (c) Provide a 95% confidence interval for the difference between the two population means. (Use x, - x,. Round your answers to two decimal places.) 0.70 |× to 3.30

You may need to use the appropriate appendix table or technology to answer this question. The following results come from two independent random samples taken of two populations. Sample 1 Sample 2 n = 50 n2 = 25 x = 13.6 X2 = 11.6 01 = 2.2 02 = 3 (a) What is the point estimate of the difference between the two population means? (Use x, - x,.) 2 (b) Provide a 90% confidence interval for the difference between the two population means. (Use x, - X,. Round your answers to two decimal places.) 1.04 x to 2,96 (c) Provide a 95% confidence interval for the difference between the two population means. (Use x, - x,. Round your answers to two decimal places.) 0.70 |× to 3.30

ENGR.ECONOMIC ANALYSIS
ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
Publisher:NEWNAN
Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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You may need to use the appropriate appendix table or technology to answer this question. The following results come from two independent random samples taken of two populations. | | Sample 1 | Sample 2 | |---------------|----------|----------| | \( n_1 = 50 \) | \( n_2 = 25 \) | | \( \bar{x}_1 = 13.6 \) | \( \bar{x}_2 = 11.6 \) | | \( \sigma_1 = 2.2 \) | \( \sigma_2 = 3 \) | **(a)** What is the point estimate of the difference between the two population means? (Use \( \bar{x}_1 - \bar{x}_2 \).) - **Answer:** 2 ✓ **(b)** Provide a 90% confidence interval for the difference between the two population means. (Use \( \bar{x}_1 - \bar{x}_2 \). Round your answers to two decimal places.) - **Answer:** 1.04 to 2.96 ✗ **(c)** Provide a 95% confidence interval for the difference between the two population means. (Use \( \bar{x}_1 - \bar{x}_2 \). Round your answers to two decimal places.) - **Answer:** 0.70 to 3.30 ✗ *Note: Boxes under parts (b) and (c) indicate incorrect answers with an "x" mark.*
Transcribed Image Text:You may need to use the appropriate appendix table or technology to answer this question. The following results come from two independent random samples taken of two populations. | | Sample 1 | Sample 2 | |---------------|----------|----------| | \( n_1 = 50 \) | \( n_2 = 25 \) | | \( \bar{x}_1 = 13.6 \) | \( \bar{x}_2 = 11.6 \) | | \( \sigma_1 = 2.2 \) | \( \sigma_2 = 3 \) | **(a)** What is the point estimate of the difference between the two population means? (Use \( \bar{x}_1 - \bar{x}_2 \).) - **Answer:** 2 ✓ **(b)** Provide a 90% confidence interval for the difference between the two population means. (Use \( \bar{x}_1 - \bar{x}_2 \). Round your answers to two decimal places.) - **Answer:** 1.04 to 2.96 ✗ **(c)** Provide a 95% confidence interval for the difference between the two population means. (Use \( \bar{x}_1 - \bar{x}_2 \). Round your answers to two decimal places.) - **Answer:** 0.70 to 3.30 ✗ *Note: Boxes under parts (b) and (c) indicate incorrect answers with an "x" mark.*
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