Safari File Edit View History Bookmarks Window Help . . BD $ 1 7 9 8 Sun May 8 6:4 h GO webassign.net C + Bb myCourses - Blackboard Learn no A HW 2 - TMTH 3360-2 (20948), section 2, Spring 2022 | WebAssign (d) Use your answers to parts (b) and (c) to explain why the data distribution cannot be mound-shaped. The approximate values given by the Empirical Rule -Select- accurate, indicating that the distribution -Select- be mound-shaped. 9. [-/3 Points] DETAILS MENDSTAT14 2.E.035. MY NOTES ASK YOUR TEACHER PRACTICE AN An article involved an analysis of 26 samples of pottery found at four different kiln sites in the United Kingdom. The samples were analyzed to determine their chemical composition. The percentage of iron oxide in each of five pottery samples collected at the site is shown below. 1.3 2.42 1.45 1.86 1.49 (a) Use the range approximation to find an estimate of s, using an appropriate divisor from the table. Number of Expected Ratio Measurements of Range to s 5 2.5 10 25 percent (b) Calculate the standard deviation s. (Round your answer to three decimal places.) S = percent How close did your estimate come to the actual value of s? The approximated value and exact value of s differ by less than 0.01. The approximated value a alue of s differ by an amount between 0.01 and 1. The approximated valu value of s differ by an amount between 1 and 10. The approximated value and exact value of s differ by an amount between 10 and 100. The approximated value and exact value of s differ by more than 100. MY NOTES ASK YOUR TEACHER PRACTICE ANO 10. [-/2 Points] DETAILS MENDSTAT14 2.E.038. High school students in an International Baccalaureate (IB) program are placed in accelerated or advanced courses and must take IB examinations in each of six subject areas at the end of their junior or senior year. Students are scored on a scale of 1-7, with 1-2 being poor, 3 mediocre, 4 ave and 5-7 excellent. During its first year of operation at a high school, 20 juniors attempted the IB economics exam, with these results. Exam Grade Number of Students 6 26,221 MAY 1 W X P O 8Safari File Edit View History Bookmarks Window Help 8 0 7 9 8 Sun May 8 6:45 PM ... h GO webassign.net C Bb myCourses - Blackboard Learn MA HW 1 - TMTH 3360-2 (20948), section 2, Spring 2022 | WebAssign 12. [2/12 Points] DETAILS PREVIOUS ANSWERS MENDSTAT14 1.E.044. MY NOTES ASK YOUR TEACHER A lake is a body of water surrounded by land. Hence, some bodies of water named "seas, " like the Caspian Sea, are actual salt lakes. In the table that follows, the length in miles is listed for the major natural lakes of the world, excluding the Caspian Sea, which has a length of 760 miles. Name Length (mi) Name Length (mi) Superior 350 Titicaca 122 Victoria 250 Nicaragua 102 Huron 206 Athabasca 208 Michigan 307 Reindeer 143 Aral Sea 260 Tonle Sap 70 Tanganyika 420 Turkana Baykal 395 Issyk Ku 115 Great Bear 192 130 Nyasa 360 Vaner 91 Great Slave 298 Nettilling Erie 241 Winnipegosis 141 Winnipeg 266 Albert 100 Ontario 193 Nipigon 72 Balkhas 376 Gairdne Ladoga 124 Urmia Maracaibo 133 Manitoba 140 Onega 145 Chad 175 90 Eyre (a) Use a stem and leaf plot to describe the lengths of the world's major lakes. (The stem represents the hundreds digit. For the leaves, use only the tens digit without rounding. Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) 0 7899999 0 0123334444 5789 1 0034 999 XXXXX 2 344 567 3 (b) Use a histogram to display these same data. Relative Relative Frequency Frequency MAY 1 W X P 8 S esc F3 delete o @ #F O 5 6 2 3 4Safari File Edit View History Bookmarks Window Help 1 7 9 8 Sun May 8 6:43 PM .. . D GO webassign.net C Bb myCourses - Blackboard Learn A HW 1 - TMTH 3360-2 (20948), section 2, Spring 2022 | WebAssign 15. [2/12 Points] DETAILS PREVIOUS ANSWERS MENDSTAT14 1.E.063. MY NOTES ASK YOUR TEACHER The following are the 2010 state gasoline taxes in cents per gallon for the 50 U.S. states and the District of Columbia.+ IS AVERAGE 477 65-5 NM 3 40.2 2 37 .4 N 45.6 Y 63.3 TN 39 .8 TX 38 .4 ND 4 7 42.9 A ADA ANOA BASEGSEFG 38.0 WODAODO 50 .6 boo in 35.2 71 51.3 (a) Construct a stem and leaf display for the data. (The stem represents the tens digit. For the leaves, use only the ones digit without rounding. Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) w (b) How would you describe the shape of this distribution? The distribution is slightly skewed to the left. . The distribution is slightly skewed to the right. The distribution is mound-shaped. 26,22 MAY 1 V X P O 8 tv . F12 FO F10 esc F3 delete $ 5 6 3Safari File Edit View History Bookmarks Window Help Q Sun May 8 6:45 PM ... G webassign.net C Bb myCourses - Blackboard Learn VA HW 2 - TMTH 3360-2 (20948), section 2, Spring 2022 | WebAssign 7. [-/4 Points] DETAILS MENDSTAT14 2.E.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The length of time required for an a cy situation was recorded for n = 10 drivers. The times (in seconds) were 0.4, 0.7, 1.0, 0.8, 0.6, 1.0, 0.6, 0.9, 0.6, 0.7. (a) Scan the data and use the range approxim ate value for s. Use this value to check your calculations in part (b). sec (b) Calculate the sample mean x and the standard deviation s. (Round your standard deviation to three decimal places.) X = S = Compare with part (a). The standard deviations from part (a) and part (b) are very close. The standard deviation from part (a) is much smaller than the standard deviation in part (b). The standard deviations from part (a) and part (b) cannot be comp because they were found using different methods. The standard deviation from part (a) is much larger than the standard deviation in part (b). MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 8. [-/5 Points] DETAILS MENDSTAT14 2. E.030. A group of laboratory animals is infected with a particular form of bacteria, and their survival time is found to average 32 days, with a standard deviation of 40 days. You can use the Empirical Rule to see why the distribution of survival times could not be mound-shaped. (a) Find the value of x that is exactly one standard deviation below the mean. X = days (b) If the distribution is in fact mound-shaped, approximately what percentage of the meas s should be less than the value of x found in part (a)? (c) Since the variable being measured is time, is it possible to find any measurements that are more than one standard deviation below the mean? yes (d) Use your answers to parts (b) and (c) to explain why the data distribution cannot be mound-shaped. The approximate values given by the Empirical Rule -Select- accurate, indicating that the distribution -Select- be mound-shaped. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 9. [-/3 Points] DETAILS MENDSTAT14 2.E.035. An article involved an analysis of 26 samples of pottery found at four different kiln sites in the United Kingdom. The samples were analyzed to determine their chemical composition. The percentage of iron oxide in each of five pottery samples collected at the site is shown below. W 26,221 MAY 1 8 44 F9 F10 Q S EA esc F3 delet O 6Safari File View History Bookmarks Window Help 8 0 7 9 8 @ Sun May 8 6:45 PM . . . ED h GO webassign.net C Bb myCourses - Blackboard Learn VA HW 1 - TMTH 3360-2 (20948), section 2, Spring 2022 | WebAssign 10. [0/14 Points] DETAILS PREVIOUS ANSWERS MENDSTAT14 1.E.030. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER To decide on the number of service counters needed for stores to be built in the future, a supermarket chain wanted to obtain information on the length of time (in minutes) required to service customers. To find the distribution of customer service times, a sample of 60 customers' service times was recorded and are shown here. 1.1 1.1 0.6 1.8 1.0 0.9 0.1 0.8 1.8 1.0 10.4 1.2 1.4 0.2 2.2 3.2 1.9 0.2 1.2 1.0 1.0 1.6 1.3 0.9 4.6 0.6 0.4 0.9 0.5 1.9 1.2 0.5 3.6 1.0 2.2 1.5 1.8 0 .5 0.8 2.4 1.6 1.2 5.2 1.8 0.6 1.0 1.2 0.8 0.5 0.5 2.2 0.3 0.6 2.8 1.5 0.2 1.7 1.0 (a) Construct a stem and leaf plot for the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) 0 O W W N U A (b) What fraction of the service times are less than or equal to 1 minute? X (c) What is the smallest of the 60 measurements? X min 26,221 MAY 1 W O "tv XP 8 SO est # o delete 7 O 3 5 6 O P