8. Commuting Times The U.S. Census Bureau reports that the average commuting time for citizens of both Baltimore, Maryland, and Miami, Florida, is approximately 29 minutes. To see if their commuting times appear to be any different in the winter, random samples of 40 drivers were surveyed in each city and the average commuting time for the month of January was calculated for both cities. The results are shown. At the 0.05 level of significance, can it be concluded that the commuting times are different in the winter? Miami Baltimore Sample size 40 40 Sample mean 28.5 min 35.2 min Population standard deviation 7.2 min 9.1 min
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- Q4 There are 9 workers for ASH Development Sdn. Bhd. Unfortunately, there are only 4 rooms available for these workers. Every week, a worker name is randomly selected to do odd jobs for the company. When a worker has been selected randomly, a these rooms are full. Based on Figure Q4, worker's ID number 0 (Umar) is randomly selected for the first week, and the 4 boxes represent 4 rooms for as shown in Table Q4. room needs to be vacated if workers. Table Q4 Worker's ID Worker's Name Umar 1. Lukman Arif Yusuf Anas Muadz Aleef Hafiz 8. Amir 9. Taufik WI 4 6 2 9. 4 1 3 8 D R2 R3 R4 W W W1 w1 Wi w1 W1 w1 w1 wi Wi W1 2 3 4 56 78 9 1 2 3 4 5 6 8 9 Figure Q4 Investigate the number of page faults occur by illustrating the way how the room is managed using the list of weekly random selection of workers as shown in Figure Q4 using the following algorithms: (a) Optimal Page Replacement (OPR) replacement algorithm 2. RRRUse the averageif function to calculate the average number of girs and average number of boys.For questions 4 and 5, use the following order for the rows in your truth tables.P QT TT FF TF FP Q RT T TT T FT F TT F FF T TF T FF F TF F F5. (14 marks) For each of the pairs of statement forms below, use the truth tablemethod to determine if (i) is logically equivalent to (ii). Show the truth tables, stateyour answers, and explain briefly.(a) (i) Q → (P ∨ R) (ii) ¬P → (Q → R)(b) (i) R → (P ∧ ¬Q) (ii) (R → P) ∧ ¬Q
- One hundred students were asked whether they had taken courses in any of the three subjects, Mathematics, Computer Science and Information Technology. The results were given below. 45 had taken Mathematics; 18 had taken Mathematics and Computer Science; 38 had taken Computer Science; 21 had taken Information Technology; 9 had taken Mathematics and Information Technology.; 4 had taken Computer Science and Information Technology and 23 had taken no courses in any of the subjects. Draw a Venn diagram that will show the results of the survey.PEAR: sort the data according to the employees salary (the last column). Use the Schwartzian transform method.Samples of 42 college students are considered for study and were categorized according to year level. The data set is FreshmenFreshmenFreshmenSophomoreJuniorFreshmenSenior SophomoreSeniorSeniorFreshmenSeniorSophomoreSophomore JuniorSophomoreFreshmenFreshmenSophomoreSophomoreFreshmen SeniorSophomoreSophomoreFreshmenFreshmenJuniorJunior SophomoreJuniorSophomoreJuniorJuniorJuniorFreshmen FreshmenSeniorJuniorFreshmenFreshmenFreshmenSophomore Solution:ClassTallyFrequency (f)Percentage (%) Total Consider the scores of 50 Grade 7 students in Math.2939263520 2226363119 2026352528 2239323219 3732283320 2026353119 2531252220 4031193220 2228333919 2026373119 ScoresfPercentage 40 39 37 36 35 33 32 31 29 28 26 25 22 20 19 Total Solution:
- Calculate the "Days on Market" in column L by finding the difference between Date Sold icokumn and Date Listed (column H) first. What is the average Sales Price for all the properties with 2or more bedrooms and more than 180 days on the market?The following table shows the student grades for Q1 and Q2 assessment activities. Calculate the mean and mode for Q1 and Q2 grades Calculate the range and standard deviation for Q1 grades and Q2 grades Student Number Q1 Grade Q2 Grade Total student Grade 1 85 79 164 2 96 85 181 3 84 76 160 4 75 76 151 5 64 94 158 6 83 83 166 7 92 92 184 8 74 71 145 9 67 81 148 10 81 93 174 11 93 72 165CONCAT the patients’ first and last name and display their DOB in the following format ‘DD, Month YYYY’. Sort the patients’ name alphabetically. PATNAME NEWDOB Allen Mcginnis 3, May 1959 Anthony Rogers 7, December 2041 Becky Roach 8, September 1975 Brian Anderson 6, March 2048 Chasity Wright 23, April 1973 Debbie Saillez 9, September 1955 J.C. Jones 17, July 2002 Jason Smith 12, December 1999 Jennifer Poole 13, May 2002 Joe Sakic 16, September 1976 John Cochran 3, March 2048 John Jackson 14, October 2043 Keith Vanderchuck 8, August 1968 Lewis Crow 16, October 2049 Linda Davis 17, July 2002 Lynn Westra 12, July 1957 Paul Kowalczyk 12, November 1951 Paul James 14, March 1997 Ryan Baily 25, December 1977 Scott James 1, March 2033 Stephanie Walters 1, January 2045 Susan Porter 14, November 1967