$84.$ In an exponential smoothing forecast, the weight associated with older data increases exponentially over time.

$85.$ A farmer develops a simple regression model to determine if there is a relationship between the amount of crop that he will harvest and the amount of rainfall. In this example, the variable "rainfall" would be the dependent variable.

$86.$ The smaller the value of the standard error of the regression estimate, the better the fit of the regression model.

$87.$ Which of the following correctly describes the focus of the Critical Path Method $($CPM$)?$

a$.$ To order activities in a project in terms of their completion time to facilitate scheduling of the activities.

b$.$ To determine when a project should be completed and to schedule when each activity in the project must begin in order to keep the project on schedule.

c$.$ To estimate the probability of completing a project by a given deadline when the time required to perform the activity is essentially a random variable.

d$.$ To structure the activities of a project in order to eliminate or reduce critical dependencies among the activities.

$88.$ Which of the following correctly describes the focus of the Program Evaluation and Review Technique $($PERT$)?$

a$.$ To order activities in a project in terms of their completion time to facilitate scheduling of the activities.

b$.$ To determine when a project should be completed and to schedule when each activity in the project must begin in order to keep the project on schedule.

c$.$ To estimate the probability of completing a project by a given deadline when the time required to perform the activity is essentially a random variable.

d$.$ To structure the activities of a project in order to eliminate or reduce critical dependencies among the activities.

$89.$ If we are employing Activity$-$On$-$Node $($AON$)$ network design, the arcs in the network diagram represent

a$.$ significance relationships.

b$.$ precedence relationships.

c$.$ tasks to complete.

d$.$ task times.

$90.$ Which of the following definitions correctly defines the acronym, PERT?

a$.$ Program Evaluation and Review Technique.

b$.$ Process Evaluation and Review Technique.

c$.$ Program Evaluation and Reduction Technique.

d$.$ Program Explanation and Reduction Technique.

$91.$ What are the immediate predecessors of activity D in this network?

a$.$ A$,$ B$,$ C

b$.$ B$,$ C

c$.$ E$,$ F

d$.$ E$,$ G$,$ H

$92.$ What are the immediate successors of activity D in this network?

a$.$ A$,$ B$,$ C

b$.$ B$,$ C

c$.$ E$,$ F

d$.$ E

$93.$ How many paths are there in the following project precedence network?

a$.6$

b$.7$

c$.8$

d$.9$

$94.$ There are various similarities between the CPM and PERT methods. Which of the following is not one of those similarities?

a$.$ Any project can be broken down into component activities that require different amounts of time.

b$.$ Any project can be broken down into component activities that must be accomplished in a specific order.

c$.$ Both techniques use the same method to calculate the time element of the activities in the project.

d$.$ Both require a detailed network of the project that clearly indicates each of the main activities and the precedence relationship among the activities.

$95.$ The longest path through a network is comprised of the activities.

a$.$ longest

b$.$ essential

c$.$ mandatory

d$.$ critical

$96.$ The critical path is the path throughout the network.

a$.$ longest

b$.$ most expensive

c$.$ shortest

d$.$ least expensive

$97.$ Which of the following is true regarding projects?

a$.$ Projects can have a unique start activity and a unique finish activity.

b$.$ Projects can have multiple start activities and a unique finish activity.

c$.$ Projects can have multiple start and finish activities.

d$.$ All of these are true regarding projects.

$98.$ What is the earliest start time for activity D in the following diagram?

a$.3$

b$.4$

c$.6$

d$.7$

$99.$ What is the latest finish time for activity D in the following diagram?

a$.6$

b$.13$

c$.14$

d$.15$

$100.$ Non$-$critical activities are distinguished by the presence of

a$.$ positive slack.

b$.$ idle resources.

c$.$ wasted time.

d$.$ zero slack.