| Section 9.2 Homework<\/td><\/tr><\/tbody><\/table><\/figure> i just need the answers for all the part please thanks<\/p> <\/p> |
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| Section 9.2 Homework<\/td><\/tr><\/tbody><\/table><\/figure> i just need the answers for all the part please thanks<\/p> <\/p> |
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<\/div><\/div><\/div><\/figure> E Homework: Section 9.2 Homework Question 1, 9.2.13 HW Score: 0%, 0 of 34 points Part 1 of 2 O Points: 0 of 2 Determine the point estimate of the population mean and margin of error for the confidence interval. Question list K Lower bound is 20, upper bound is 24. O Question 1 The point estimate of the population mean is O Question 2 O Question 3 O Question 4 O Question 5 O Question 6 Question 7 Question 8Question 2, 9.2.17 HW Score: 0%, 0 of 34 points Save E Homework: Section 9.2 Homework Part 1 of 6 Points: 0 of 9 A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 105, and the sample standard deviation, s, is found to be 10. Question list K (a) Construct an 80% confidence interval about u if the sample size, n, is 22. (b) Construct an 80% confidence interval about u if the sample size, n, is 12. (c) Construct a 70% confidence interval about u if the sample size, n, is 22. (d) Could we have computed the confidence intervals in parts (a)-(c) if the population had not been normally distributed? O Question 1 Click the icon to view the table of areas under the t-distribution. - X Table of t-Distribution Areas O Question 2 (a) Construct an 80% confidence interval about u if the sample size, n, is 22. O Question 3 Lower bound: ; Upper bound: (Use ascending order. Round to one decimal place as needed.) Area in right tail O Question 4 Question 5 Table VI t-Distribution Area in Right Tail O Question 6 df 0.25 0.20 0.15 0.10 0.05 0.025 0.02 0.01 0.005 0.0025 0.001 0.000 1.000 1.376 1.963 3.078 6.314 12.706 15.894 31.821 63.657 127.321 318.309 636.61 O Question 7 0.816 1.061 1.386 1.886 2.920 4.303 4.849 6.965 9.925 14.089 22.327 31.59 0.765 0.978 1.250 1.638 2.353 3.182 3.482 4.541 5.841 7.453 10.215 12.92 0.741 0.941 1.190 1.533 2.132 2.776 2.999 3.747 4.604 5.598 7.173 8.61 0.727 0.920 1.156 1.476 2.015 2.571 2.757 3.365 4.032 4.773 5.893 6.86 DOYa MAWNE O Question 8 0.718 0.906 1.134 1.440 1.943 2.447 2.612 3.143 3.707 4.317 5.208 5.95 0.711 0.896 1.119 1.415 1.895 2.365 2.517 2.998 3.499 4.029 4.785 5.40 0.706 0.889 1.108 1.397 1.860 2.306 2.449 2.896 3.355 3.833 4.501 5.04 0.703 0.883 1.100 1.383 1.833 2.262 2.398 2.821 3.250 3.690 4.297 4.78 10 0.700 0.879 1.093 1.372 1.812 2.228 2.359 2.764 3.169 3.581 4.144 158 11 0.697 0.876 1.088 1.363 1.796 2.201 2.328 2.718 3.106 3.497 4.025 4.43 12 0.695 0.873 1.083 1.356 1.782 2.179 2.303 2.681 3.055 3.428 3.930 4.31 13 0.694 0.870 1.079 1.350 1.771 2.160 2.282 2.650 3.012 3.372 3.852 4.22 14 0.692 0.868 1.076 1.345 1.761 2.145 2.264 2.624 2.977 3.326 3.787 4.14 15 0.691 0.866 1.074 1.341 1.753 2.131 2.249 2.602 2.947 3.286 3.733 4.07E Homework: Section 9.2 Homework Question 3, 9.2.23 HW Score: 0%, 0 of 34 points O Points: 0 of 3 A trade magazine routinely checks the drive-through service times of fast-food restaurants. A 95% confidence interval that results from examining 652 customers in one fast-food chain's drive-through has a lower bound of 168.1 seconds and an Question list K 171.5 seconds. What does this mean? O Question 1 Choose the correct answer below. O Question 2 O A. One can be % confident that the mean drive-through service time of this fast-food chain is seconds. O B. The mean drive-through service time of this fast-food chain is seconds % of the time. O C. There is a % probability that the mean drive-through service time of this fast-food chain is between seconds and seconds. O Question 3 O D. One can be % confident that the mean drive-through service time of this fast-food chain is between seconds and seconds. Question 4 O Question 5 Question 6 O Question 7 O Question 8E Homework: Section 9.2 Homework Question 4, 9.2.25 HW Score: 0%, 0 of 34 points O Points: 0 of 2 In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for the mean number of Question list K upper bound of 44.5. Provide two recommendations for decreasing the margin of error of the interval. O Question 1 Select the two recommendations that would decrease the margin of error of the interval. A. Decrease the standard deviation of hours worked. Question 2 B. Increase the sample size. c. Use fewer degrees of freedom. O Question 3 D. Decrease the sample size. E. Increase the confidence level. OF. Decrease the confidence level. O Question 4 O Question 5 O Question 6 O Question 7 O Question 8E Homework: Section 9.2 Homework Question 5, 9.2.27-T HW Score: 0%, 0 of 34 points Part 1 of 4 O Points: 0 of 6 Question list K A researcher wishes to estimate the average blood alcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC values. He randomly selects records from 51 such drivers in 2009 and determines the sample n to be 0.15 g\/dL with a standard deviation of 0.060 g\/dL. Complete parts (a) through (d) below. O Question 1 (a) A histogram of blood alcohol concentrations in fatal accidents shows that BACs are highly skewed right. Explain why a large sample size is needed to construct a confidence interval for the mean BAC of fatal crashes with a positive BAC. A. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is necessary to ensure that the distribution of the sample mean is approximately normal. Question 2 O B. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is needed to maximize the margin of error to ensure that both tails are accounted for in the confidence interval. O C. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is needed to minimize the margin of error to ensure only the peak of the sampling distribution is captured in the confidence interval. O Question 3 O D. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is needed to ensure that it contains at least 5% of the population. O Question 4 O Question 5 O Question 6 O Question 7 O Question 8E Homework: Section 9.2 Homework Question 6, 9.2.31 HW Score: 0%, 0 of 34 points Part 1 of 4 O Points: 0 of 8 Save The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a population Question list K that is normally distributed. A boxplot indicates there are no outliers. Complete parts a) through d) below. 5.30 5.72 4.99 4.80 5.02 4.60 4.74 5.19 4.87 4.76 4.56 5.70 O Question 1 Click the icon to view the table of critical t-values. O Question 2 (a) Determine a point estimate for the population mean. Table of Critical t-Values - X Question 3 A point estimate for the population mean is. (Round to two decimal places as needed.) O Question 4 Area in right tail f-Distribution O Question 5 Area in Right Tail Degrees of Freedom 0.25 0.20 0.15 0.10 0.05 0.025 0.02 0.01 0.005 0.0025 0.001 0.0005 1.000 1.376 1.963 3.078 6.314 12.706 15.894 31.821 63.657 127.321 318.309 636.619 0.816 1.061 1.386 1.886 2.920 4.303 4.849 6.965 9.925 14.089 22.327 31.599 Question 6 0.765 0.978 1.25 1.638 2.353 3.18 3.482 4.541 5.841 7453 10.215 12.924 0.741 0.941 1.190 1.533 2132 2.776 2.900 3.747 4.604 5.598 7173 8.610 0.727 0.920 1.156 1.476 2015 2.571 2.757 3.365 4.032 4.773 5.893 6.869 0.718 0.906 1.134 1.440 1.943 2.447 2.612 3.143 3.707 4.317 5.208 5.959 0.711 0.896 1.119 1.415 1.895 2.365 2.517 2.998 3.499 4.029 4.785 5.408 O Question 7 0.706 0.889 1.108 1.397 1.860 2.306 2,440 2.896 3.355 3.833 4.501 5.041 0.703 0.883 1.100 1.383 1.833 2.262 2.398 2.821 3.250 3.690 4.297 4.781 0.700 0.879 1.093 1.372 1.812 2.228 2.359 2.764 3.169 3.581 4.144 4.587 0.697 0.876 1.088 1.363 1.796 2.201 2.328 2.718 3.106 3.497 4.025 4.437 0.695 0.873 1.083 1.356 2.179 2.303 2.681 3.055 3.428 3.930 4.318 O Question 8 0.694 0.870 1.070 1.350 1771 2.160 2.282 2.650 3.012 3.372 3.85 4.221 0.692 0.868 1.076 1.345 1,761 2.145 2.264 2.624 2.977 3.326 3.787 4.140 15 0.691 0.866 1.074 1.341 1.753 2.131 2.249 2.602 2.047 3.286 3.733 4.073 16 0.690 0.865 1.071 1.337 1.746 2.120 2.235 2.583 2.921 3.252 3.686 4.015 17 0.689 0.863 1.069 1.333 1,740 2.110 2.224 2.567 2.898 3.222 3.646 3.965 is 0.688 0.862 1.067 1.330 1.734 2.101 2.214 2.552 2.878 3.197 3.610 3.922 19 0.688 0.861 1.066 1.328 1.729 2.093 2.205 2.539 2.861 3.174 3.579 3.883 0.687 0.860 1.064 1.325 1.725 2.086 2.197 2.528 2.845 3.153 3.552 3.850 0.686 0.850 1.063 1.323 1.721 2.080 2.189 2.518 2.831 3.135 3.527 3.819 0.686 0.858 1.061 1.321 1.717 2.074 2.183 2.508 2.819 3.119 3.505 3.792E Homework: Section 9.2 Homework uestion \/, 9.2.41 HW Score: 0%, 0 of 34 points Save Part 1 of 3 O Points: 0 of 3 A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s = 18.3 based on earlier studies? Suppose the doctor Question list K would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. Question 1 A 99% confidence level requires subjects. (Round up to the nearest subject.) Question 2 O Question 3 - X O Question 4 Partial Critical Value Table O Question 5 Level of Confidence, (1 - () . 100% Area in Each Tail, ? Critical Value, Za\/2 90% 0.05 1.645 95% 0.025 1.96 Question 6 99% 0.005 2.575 O Question 7 Print Done O Question 8",
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