I am really struggling with these questions and need help solving them.
Where Do Advertising Dollars Go? Other 1 696 Pl'll'lt 32% Direct Mail 20% Fledio 8% Click here for the Excel Data File (a) What kind of display is this? 0 Standard pie chart 0 Column chart 0 Line chart (b-1) Identify its strengths, using the tips and checklists shown in this chapter. 0 Labels on Y axes 0 Use of gridlines O Source identied (ta-2) Identify its weaknesses, using the tips and checklists shown in this chapter. 0 Distracting pictures 0 Dramatic title 0 Other 10 An 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 6 3 13 2 2 1 26 3 1 3 1 2 1 7 1 2 3 1 2 12 1 4 2 2 29 1 1 1 B 5 1 4 2 1 1 1 1 6 1 2 3 3 6 1 3 1 1 5 1 13 Click here for the Excel Data File (b) 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? 0 Yes 0 No (d) Are the data symmetric or skewed? If skewed, which direction? 0 Yes, the data are skewed to the right. 0 No, the distribution is symmetric. 0 Yes, the data are skewed to the left. 11 Consider the following sample data. Sample A: 4, 9, 14 Sample 3: 75, ED, 85 Sample C: 1,070; 1,075: 1,080 (a) Find the mean and standard deviation for each sample. 5 is A: 5 is B: 5 is C: Mean Sample Standard Deviation (b) What does this exercise show about the standard deviation? 0 The idea is to illustrate that the standard deviation is not a function of the value of the mean. 0 The idea is to illustrate that the standard deviation is a function of the value ofthe mean. 12 The durations (minutes) of 26 electric power outages in the community of Sonando Heights over the past ve years are shown below. 37 49 24 67 25 13 55 12 50 5 15 43 43 102 32 19 13 50 22 3 17 27 90 25 14 21 Click here for the Excel Data File (a) Find the mean, median, and mode. (Round your answers to 2 decimal places.) Descriptive Statistics Data Mean Median Mode (b) Are the mean and median about the same? Clickto select v .the mean is Click to select v the median. (c) Is the mode a good measure of center for this data set? 0 Yes 0 No (d) Is the distribution skewed? 0 Yes. the distribution is skewed right. 0 Yes. the distribution is skewed left. 0 No, the distribution is symmetric. 13 Scores on an accounting exam ranged from 48 to 96, with quartiles Q,= 65.00, Q2= 82.5, and Q3=85.75. (a) Select the correct box plot for the given data. BoxPlot A BoxPlot B BoxPlot C BoxPlot BoxPlot BoxPlot 100 40 50 60 70 80 90 100 40 50 60 70 80 90 100 40 50 60 70 80 90 BoxPlot A BoxPlot B O BoxPlot C (b) Describe its shape (skewed left, symmetric, skewed right). O The distribution is skewed right. O The distribution is symmetric. The distribution is skewed left.14 The contingency table below shows the results of a survey of video viewing habits by age. Video Viewing Platform Preferred Viewer Age Mobile/ Laptop Device '1"? Screen Raw Total 1 83 4 3 2 3 5 6 7 3 55 4 1 1 1 1 2 2 5 5+ 4 '1' 1 1 Column Total 47 53 10!} 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 |:| (c) Percentage of viewers who are 1834 and prefer videos on a mobile or laptop device. Percentage of viewers |:| as (d) Percentage of viewers given they are 1834 who prefer videos on a mobile or laptop device. (Round your answer to 2 declmal 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 16 The discrete random variable X is the number of passengers waiting at a bus stop. The table below shows the probability distribution for X. What is the expected value E(X) for this distribution? X 0 1 2 3 Total P(X) . 40 . 30 . 20 10 1.00 Multiple Choice O 1.1 1.0 O 1.7 1.917 A random variable is binomially distributed with n = 16 and IT= .40. The expected value and standard deviation of the variables are Multiple Choice O 2.00 and 1.24 O 4.80 and 4.00 O 6.40 and 1.96 O 2.00 and 1.2018 Tire pressure monitoring systems (TPMS) warn the driver when the tire pressure ofthe vehicle is 27% below the target pressure. Suppose the target tire pressure of a certain car is 32 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 |:| psi. (b) Suppose tire pressure is a normally distributed random variable with a standard deviation equal to 3 psi. If the 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 inflation range is 30 psi to 34 psi. Assume the tires' average psi is on target. lfa tire on the car is inspected at random, what is the probability that the tire's ination is within the recommended range? (Round your Intermediate calculations and final answer to 4 decimal places.) Probability |:| 19 Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 24 minutes and a standard deviation of 6 minutes, while method B has a mean of 28 minutes and a standard deviation of 3.0 minutes. (a) Which procedure is preferred if the procedure must be completed within 25 minutes? O Method A O Method B O Either Method (b) Which procedure is preferred if the procedure must be completed within 34.0 minutes? O Method A O Method B O Either Method (c) Which procedure is preferred if the procedure must be completed within 32 minutes? O Method A O Method B O Either Method
