In linear programming, sensitivity analysis is associated with: (I) objective function coefficient (II) right-hand side values of constraints (III) constraint coefficient A. I and II B. II and III C. I, II and III D. I and III E. none of the above

The manager wants to forecast the month 6's sales using the following historical data: Months Month 1 Month 2 Month 3 Month 4 Month 5 Sales 20 25 32 35 38 Please use the weight 0.45 for Month 5, weight 0.25 for Month 4, weight 0.2 for Month 3, and weight 0.1 for Month 2 to use the weighted moving average to forecast the demand of Month 6. Month 5 = 0.1*(25) +0.2*(32) + .25* (35) divided by 0.1 +0.2 +1.25 -17.65/0.55 = 32.09 Month 6= 0.1* (25) +0.2* (32) +0.25 (35) +0.45* (38) divided by 0.1 +0.2+0.45 = 34.75

Using back-substitution, show that an ARMA(1, 1) model may be written as eitheran AR or an MA model.

The number of students enrolled in Spring Valley Elementary school has been steadily increasing over the past five years. The School Board would like to forecast enrolment for years 6 and 7 in order to better plan capacity. The past five years enrolment is indicated in table 3: Table 3 Year Enrollment 1 220 2 245 3 256 4 289 5 310  Assuming a linear trend, use the tabular method to derive values for: the slope the intercept  How did you work out to get 22.4 for the slope and for the intercept how did you work it out and get 196.8

One of the assumptions made in simple regression is that ______________.   a. the error terms are exponentially distributed   b. the error terms have unequal variances   c. the model is linear   d. the error terms are dependent   e. the model is nonlinear

In a research study, a linear regression analysis was performed to investigate the relationship between the size of a household (number of family members) and their monthly grocery expenses (in dollars). The linear model obtained is Y=200+150X Where: Y represents the predicted monthly grocery expenses and X represents the size of the household (number of family members). Interpret the slope in context, including the numeric value of the slope and the units of both X and Y. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial P 10pt > A VV Ix SE X QS |||| 0 WORDS POWERED BY TINY

A manager intends to order a new machine and must now decide on the number of spare parts to order along with the machine. The parts cost $496 each and have no salvage value. The manager has compiled the frequency distribution for the probable usage of spare parts:7 spare parts with frequency 0.05;8 spare parts with frequency 0.23;9 spare parts with frequency 0.08;10 spare parts with frequency 0.07; and 11 spare parts with frequency 0.57. For what range of shortage costs would stocking 9 spare parts constitute an optimal decision ? a. Between 231.5and 334.8 b. Between 192.9and 279 c. Between 289.3and 418.5 d. Between 96.44and 139.5

answer a,b,c

Sensitivity analysis in linear programming is used to: a) Determine the effect of changes in the coefficients of the objective function  b) Determine the effect of changes in the right-hand side of constraints c) Both a and b  d) Neither a nor b

Time-series analysis is based on the assumption that: a. there are dependable correlations between the variable to be forecast and other independent variables. b. random error terms are normally distributed. c. the data do not exhibit a trend. d. past patterns in the variable to be forecast will continue unchanged into the future.