Question Which of the following statements are correct? The sample mean, regarded as a statistic (before a sample has been selected or an experiment carried out), is denoted by X-bar while the calculated value of this statistic is x-bar. hy s2 represents the sample standard deviation and is regarded as a statistic, while the calculated value of this statistic is s A statistic is any quantity whose value can be calculated from population data. All of the above statements are correct.

There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scores is approximately Normal with mean u = 21.5 and standard deviation o = 5.4. SAT scores are reported on a scale from 600 to 2400. The distribution of SAT scores is approximately Normal with mean u = 1498 and standard deviation o = 316. Exercises 124 through 133 are based on this information. 72 124 Compare an SAT score with an ACT score. Jessica scores 1830 on the SAT. Ashley scores 27 on the ACT. Assuming that both tests measure the same thing, who has the higher score? Report the Z-scores for both students. ing, v

GENG8020 Assignment #4 Earned Value Analysis Your project team has been tasked with assembling 100 data acquisition systems in 8 days. The estimated cost of each unit is $10,000, for a total project cost of $1,000,000 The following table provides the schedule and cost estimates determined at the start of the project: Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Planned Day 8 10 12 15 18 15 15 10 5 number of built systems Estimated 100,000 120,000 150,000 180,000 150,000 150,000 100,000 cost for 50,000 the day (5) Estimated 100,000 220,000 370,000 550,000 700,000 850,000 950,000 cumulative 1,000,000 cost (5) What is the budgeted cost of work scheduled (BCWS)? $550,000 What is the budgeted cost of work performed (BCWP)? $500,000 What is the actual cost of work performed (ACWP)? $500,000 Calculate the schedule variance (SV). SV = 550,000 - 500,000 = $50,000 Calculate the cost variance (CV). CV = 500,000 - 500,000 = 0 Calculate the Schedule Performance Index (SPI). SPI = 550,000 / 500,000 = 1.1 Calculate the Cost Performance Index (CPI). CPI = 500,000/500,000 = 1

The number of students infected with the flu on a college campus after t days is modeled by the function 200 What is the maximum number of infected students possible The number of students infected with the flu on a college campus after days is modeled by the function P 1.19-23 OA 120 students Ostudents C 4 stores OD 240 students

Please show all work, thank you! Find the solution space of the homogeneous system of equations. X1 -3x2 + x3=0 2x1 - 6x2 +2x3=0 3x1 -9x2 + 3x3=0

Calculate the coefficient of variation for the following sample data. 10 14 13 11 12 cv=% (Round to two decimal places as needed.)

Moments and shear stress 2. The following figure shows all the stresses on a small volume element (of volume dxdydz) in equilibrium. By calculating the moments about the centre of the element and understanding that in equilibrium the total sum of moments around the x, y and z axes are zero, prove that: Txy Tyx Txz = T7x and Tyz Tzy dx буг бу dz Ох бу Оух xy Moments and shear stress 2. The following figure shows all the stresses on a small volume element (of volume dxdydz) in equilibrium. By calculating the moments about the centre of the element and understanding that in equilibrium the total sum of moments around the x, y and z axes are zero, prove that: Txy Tyx Txz = T7x and Tyz Tzy dx буг бу dz Ох бу Оух xy бх dy (Hint: calculate the moments about the centre of the element in the x, y and z axes separately.) 60