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E Questiur State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.) a. Changing from a 95% confidence level to a 90% confidence level. b. Changing from a sample size of 250 to a sample size of 15. c. Changing from a standard deviation of 25 pounds to a standard deviation of 20 pounds. E Click the icon to view the t-table.

E Questiur State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.) a. Changing from a 95% confidence level to a 90% confidence level. b. Changing from a sample size of 250 to a sample size of 15. c. Changing from a standard deviation of 25 pounds to a standard deviation of 20 pounds. E Click the icon to view the t-table.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Question Heip State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.) a. Changing from a 95% confidence level to a 90% confidence level. b. Changing from a sample size of 250 to a sample size of 15. c. Changing from a standard deviation of 25 pounds to a standard deviation of 20 pounds. E Click the icon to view the t-table. a. How will changing from a 95% confidence level to a 90% confidence level affect the width of the confidence interval? O A. The interval will become narrower. O B. The interval will become wider. O C. This change will not affect the width of the interval. b. How will changing from a sample size of 250 to a sample size of 15 affect the width of the confidence interval? O A. The interval will become narrower. O B. The interval will become wider. O C. This change will not affect the width of the interval. c. How will changing from a standard deviation of 25 pounds to a standard deviation of 20 pounds affect the width of the confidence interval?
Transcribed Image Text:Question Heip State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.) a. Changing from a 95% confidence level to a 90% confidence level. b. Changing from a sample size of 250 to a sample size of 15. c. Changing from a standard deviation of 25 pounds to a standard deviation of 20 pounds. E Click the icon to view the t-table. a. How will changing from a 95% confidence level to a 90% confidence level affect the width of the confidence interval? O A. The interval will become narrower. O B. The interval will become wider. O C. This change will not affect the width of the interval. b. How will changing from a sample size of 250 to a sample size of 15 affect the width of the confidence interval? O A. The interval will become narrower. O B. The interval will become wider. O C. This change will not affect the width of the interval. c. How will changing from a standard deviation of 25 pounds to a standard deviation of 20 pounds affect the width of the confidence interval?
Right Tail Probability t Distribution Critical Values Confidence Level 80% 90% 95% 98% 99% 99.8% Right-Tail Probability df t,100 t.o50 t025 to10 to05 t,001 1 3.078 6.314 12.706 31.821 63.656 318.289 2 1.886 2.920 4.303 6.965 9.925 22.328 3 1.638 2.353 3.182 4.541 5.841 10.214 4 1.533 2.132 2.776 3.747 4.604 7.173 1.476 2.015 2.571 3.365 4.032 5.894 6. 1.440 1.943 2.447 3.143 3.707 5.208 7 1.415 1.895 2.365 2.998 3.499 4.785 8. 1.397 1.860 2.306 2.896 3.355 4.501 1.383 1.833 2.262 2.821 3.250 4.297 10 1.372 1.812 2.228 2.764 3.169 4.144 11 1.363 1.796 2.201 2.718 3.106 4.025 12 1.356 1.782 2.179 2.681 3.055 3.930 13 1.350 1.771 2.160 2.650 3.012 3.852 14 1.345 1.761 2.145 2.624 2.977 3.787 15 1.341 1.753 2.131 2.602 2.947 3.733 16 1.337 1.746 2.120 2.583 2.921 3.686 17 1.333 1.740 2.110 2.567 2.898 3.646 18 1.330 1.734 2.101 2.552 2.878 3.611 19 1.328 1.729 2.093 2.539 2.861 3.579 20 1.325 1.725 2.086 2.528 2.845 3.552 21 1.323 1.721 2.080 2.518 2.831 3.527 22 1.321 1.717 2.074 2.508 2.819 3.505 23 1.319 1.714 2.069 2.500 2.807 3.485 24 1.318 1.711 2.064 2.492 2.797 3.467 25 1.316 1.708 2.060 2.485 2.787 3.450 26 1.315 1.706 2.056 2.479 2.779 3.435 27 1.314 1.703 2.052 2.473 2.771 3.421 28 1.313 1.701 2.048 2.467 2.763 3.408 29 1.311 1.699 2.045 2.462 2.756 3.396 30 1.310 1.697 2.042 2.457 2.750 3.385 40 1.303 1.684 2.021 2.423 2.704 3.307 50 1.299 1.676 2.009 2.403 2.678 3.261 60 1.296 1.671 2.000 2.390 2.660 3.232 80 1.292 1.664 1.990 2.374 2.639 3.195 100 1.290 1.660 1.984 2.364 2.626 3.174 1.282 1.645 1.960 2.326 2.576 3.091 00
Transcribed Image Text:Right Tail Probability t Distribution Critical Values Confidence Level 80% 90% 95% 98% 99% 99.8% Right-Tail Probability df t,100 t.o50 t025 to10 to05 t,001 1 3.078 6.314 12.706 31.821 63.656 318.289 2 1.886 2.920 4.303 6.965 9.925 22.328 3 1.638 2.353 3.182 4.541 5.841 10.214 4 1.533 2.132 2.776 3.747 4.604 7.173 1.476 2.015 2.571 3.365 4.032 5.894 6. 1.440 1.943 2.447 3.143 3.707 5.208 7 1.415 1.895 2.365 2.998 3.499 4.785 8. 1.397 1.860 2.306 2.896 3.355 4.501 1.383 1.833 2.262 2.821 3.250 4.297 10 1.372 1.812 2.228 2.764 3.169 4.144 11 1.363 1.796 2.201 2.718 3.106 4.025 12 1.356 1.782 2.179 2.681 3.055 3.930 13 1.350 1.771 2.160 2.650 3.012 3.852 14 1.345 1.761 2.145 2.624 2.977 3.787 15 1.341 1.753 2.131 2.602 2.947 3.733 16 1.337 1.746 2.120 2.583 2.921 3.686 17 1.333 1.740 2.110 2.567 2.898 3.646 18 1.330 1.734 2.101 2.552 2.878 3.611 19 1.328 1.729 2.093 2.539 2.861 3.579 20 1.325 1.725 2.086 2.528 2.845 3.552 21 1.323 1.721 2.080 2.518 2.831 3.527 22 1.321 1.717 2.074 2.508 2.819 3.505 23 1.319 1.714 2.069 2.500 2.807 3.485 24 1.318 1.711 2.064 2.492 2.797 3.467 25 1.316 1.708 2.060 2.485 2.787 3.450 26 1.315 1.706 2.056 2.479 2.779 3.435 27 1.314 1.703 2.052 2.473 2.771 3.421 28 1.313 1.701 2.048 2.467 2.763 3.408 29 1.311 1.699 2.045 2.462 2.756 3.396 30 1.310 1.697 2.042 2.457 2.750 3.385 40 1.303 1.684 2.021 2.423 2.704 3.307 50 1.299 1.676 2.009 2.403 2.678 3.261 60 1.296 1.671 2.000 2.390 2.660 3.232 80 1.292 1.664 1.990 2.374 2.639 3.195 100 1.290 1.660 1.984 2.364 2.626 3.174 1.282 1.645 1.960 2.326 2.576 3.091 00
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