Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 31 minutes and a standard deviation of 2 minutes, while method B has a mean of 35 minutes and a standard deviation of 1.0 minutes. (a) Which procedure is preferred if the procedure must be completed within 30 minutes? O Method A O Method B O Either Method (b) Which procedure is preferred if the procedure must be completed within 38.0 minutes? O Either Method O Method A O Method B (c) Which procedure is preferred if the procedure must be completed within 37 minutes? O Method B O Either Method O Method A\fConsider the following graph. Where Do Advertising Dollars Go? Other 16% - Print 32% Direct Mail 20% Radio TV 8% 24% _Click here for the Excel Data File (a) What kind of display is this? O Column chart Standard ple chart O Line chart (b-1) Identify Its strengths, using the tips and checklists shown In this chapter. Labels on Y axes O Use of gridlines Source Identified (b-2) Identify its weaknesses, using the tips and checklists shown In this chapter. Non-zero origin O Distracting pictures Dramatic title O OtherAn executive's telephone log showed the lengths of 60 calls initiated during the last week of July. 1 2 10 5 3 3 2 20 1 1 5 3 13 2 2 1 26 3 1 3 1 2 1 T 1 2 3 1 2 12 1 4 2 2 29 1 1 1 E 5 1 4 2 1 1 1 1 5 1 2 3 3 6 1 3 1 1 5 1 18 Click here for the Excel Data File lb} Find the mean, median, and mode. {Round your answers to 2 decimal places} Descriptive Statistics count Data Mean Median Mode (1:) Do the measures of center agree? @I Yes O No Id} Are the data symmetric or skewed? If skewed, which direction? O Yes, the data are skewed to the right O No, the distribution is symmetric. @ Yes, the data are skewed to the left. Consider the following sample data. Sample A: 12, 21, 30 Sample B: 70, 79, 88 Sample C: 1, 045; 1, 054; 1, 063 (a) Find the mean and standard deviation for each sample. Sample A: Sample B: Sample C: Mean Sample Standard Deviation (b) What does this exercise show about the standard deviation? The idea is to illustrate that the standard deviation is not a function of the value of the mean. O The idea is to illustrate that the standard deviation is a function of the value of the mean.The durations {minutes} of 26 electric power outages in the community of Sonando Heights over the past ve years are shown below. 32 4? 26 68 27 9 SE 11 50 4 16 49 3E 98 30 22 12 50 35 2 25 24 86 29 15 16 Click here for the Excel Data File In} Find the mean, median, and mode. {Round your answersto Zdecimal places.) Descriptive Statistics Data Mean Median Mode lb} Are the mean and median about the same? (Click to select} v ,the mean is (Click to select} v the median. (1:) Is the mode a good measure of center for this data set? 0 Yes O No Id} Is the distribution skewed? O No, the distribution is symmetric. 0 Yes, the distribution is skewed right. 0 Yes, the distribution is skewed left. Scores on an accounting exam ranged from 54 to 94, with quartiles Q,= 62.00, Q2=66.5, and Q3= 89.50. (a) Select the correct box plot for the given data. BoxPlot A BoxPlot B BoxPlot C BoxPlot BoxPlot BoxPlot 90 100 40 50 60 70 80 90 100 40 50 60 70 80 90 100 40 50 60 70 80 O BoxPlot A O BoxPlot B O BoxPlot C (b) Describe its shape (skewed left, symmetric, skewed right). O The distribution is symmetric. O The distribution is skewed left. O The distribution is skewed right.The contingency table below shows the results ofa survey of video viewing habits by age. Video Viewing Plat-Form Preferred Viewer Age Mobile/Laptop Device TV Screen Row Total 1834 3? 22 59 3554 13 13 26 55+ 6 '3 15 Column Total 56 44 166 Find the following probabilities or percentages: [a] Probability that a viewer is aged 1834. (Round your answer to 2 decimal places.) Probability [b] Probability that a viewer prefers watching videos on a TV screen. {Round your answer to 2 decimal places.) Probability [:1 Percentage of viewers who are 1834 and prefer videos on a mobile or laptop device. Percentage of viewers 96 [d] Percentage of viewers given they are 1834 who prefer videos on a mobile or laptop device. {Round your answer to 2 decimal places.) Percentage of viewers 96 {e} Percentage of viewers who are 3554 or prefer videos on a mobile or laptop device. Percentage of viewers 96 Tire pressure monitoring systems (TPMS) warn the driver when the tire pressure of the vehicle is 24% below the target pressure. Suppose the target tire pressure of a certain car is 29 psi [pounds per square inch.) (a) At what psi will the TPMS trigger a warning for this car? (Round your answer to 2 decimal place.) When the tire pressure is (Click to select) v psi. (b) Suppose tire pressure is a normally distributed random variable with a standard deviation equal to 3 psi. lfthe car's average tire pressure is on target. what is the probability that the TPMS will trigger a warning? {Round your answer to 4 decimal places.) Probability (c) The manufacturer's recommended correct ination range is 27 psi to 31 psi. Assume the tires\" average psi is on target. If a tire on the car is inspected at random, what is the probability that the tire's inflation is within the recommended range? (Round your intermediate calculations and nal answer to 4 decimal places.) Probability
