Archives: Quiz

When a rigid body rotates about a fixed axis all the points in the body have the same centripetal acceleration. The allowed values for the magnetic quantum number, m , are from m = -ℓ to +ℓ. Answer: TRUE Electrons […]

A force is required to keep an object moving along a horizontal line. When light travels from a larger index of refraction towards a smaller index of refraction, there is no phase change upon reflection at the boundary. Answer: TRUE […]

According to Einstein’s theory of general relativity, a ray of light bends in an accelerated frame of reference. A wave front is not a surface of constant phase within a wave. Answer: FALSE When a rigid body rotates about a […]

The pressure in a gas is the result of the momentum transfer that occurs when the molecules bounce from the walls of the container. Dimensional analysis can tell you whether an equation is physically correct. Answer: FALSE The process of […]

The request for proposal may contain valuable information for a project audit. Morale of the project team is a key responsibility of the project manager. Answer: True An overload of reporting is just as dangerous as underreporting. Answer: True The […]

Project evaluation appraises the performance of a project relative to the project’s initial or revised plan. Measuring the project’s performance against a planned budget and schedule is generally straightforward. Answer: True The start-to-finish linkage is used in situations where is […]

Technical dependencies are often harder to see on a Gantt chart than on a PERT/CPM network. The process of line balancing is when individual production lines are made to generate the required amount of product with a little excess capacity […]

Organizational structure should be addressed in the project final report. The details of the project work force are discussed in the Resource Requirements section of the project master plan. Answer: False It is easiest to see lead and lag time […]

The amount of resources a project can use depends in part on the timing of the allocation. A disadvantage of using beta distribution to approximate activity times is that it is generally less flexible than the normal distribution. Answer: False […]

Often it is beneficial to crash activities not on the critical path. One way of linking planning and control is to monitor project progress on the MSP Gantt chart. Answer: True Expected value is a tool for risk analysis. Answer: […]

The most important use of data gathered from monitoring is control. The primary purpose of the launch meeting is to develop the project plan and budget. Answer: False If a PM manages her project well enough she can eliminate uncertainty. […]

The formula for the expected time of an activity in a network assumes that the optimistic, pessimistic, and most likely time estimates have a Beta distribution. Projects with deliverables that are incrementally different from existing offerings are classified as platform […]

NARRBEGIN: SA_57_64 Amanda is a recent college graduate, and has just started her first job. She would like to know if she saves $5,000 per year out of her salary over the next 30 years what the distribution of the […]

In order to construct a confidence interval estimate of the population mean , the value of must be given. In developing a confidence interval for the population standard deviation , we make use of the fact that the sampling distribution […]

The expected value of perfect information (EVPI) is the most the decision maker would be willing to pay for the sample information. In transportation problems, shipping costs are often nonlinear due to quantity discounts. Answer: T The F-test of the […]

NARRBEGIN: SA_82_85 Below you will find summary measures on salaries for classroom teachers across the United States. You will also find a list of selected states and their average teacher salary. All values are in thousands of dollars. Salaries for […]

In a multistage decision problem, decisions and outcomes alternate. That is, a decision maker makes a decision, then some uncertainty is resolved, then the decision maker makes a second decision, then some further uncertainty is resolved, and so on. NARRBEGIN: […]

If we draw a straight line through the points in a scatterplot and most of the points fall close to the line, there is a strong positive linear relationship between the two variables. The expected value of sample information (EVSI) […]

In a transportation problem, if it costs $4 per item to ship up to 200 items between cities, and $2 per item for each additional item, the proportionality assumption of LP is satisfied. Expressed in percentiles, the interquartile range is […]

A car dealer in Big Rapids, Michigan is using Holt’s method to forecast weekly car sales. Currently the level is estimated to be 45 cars per week, and the trend is estimated to be 5 cars per week. During the […]

In a simple regression with a single explanatory variable, the multiple R is the same as the standard correlation between the Y variable and the explanatory X variable. In conducting hypothesis testing for difference between two means when samples are […]

Three important themes run through this book: data analysis, decision-making, and dealing with uncertainty. NARRBEGIN: SA_57_64 Amanda is a recent college graduate, and has just started her first job. She would like to know if she saves $5,000 per year […]

A sport preference poll yielded the following data for men and women. Use the 5% significance level and test to determine if sport preference and gender are independent. NARRBEGIN: SA_97_101 A customer has approached a local credit union for a […]

NARRBEGIN: SA_104_112 Mrs. Rich has just bought a new $30,000 car. As a reasonably safe driver, she believes that there is only a 5% chance of being in an accident in the forthcoming year. If she is involved in an […]

Phone numbers, Social Security numbers, and zip codes are examples of numerical variables. The relative frequency of an event is the number of times the event occurs out of the total number of times the random experiment is run. Answer: […]

If the partial F test indicates that a group of variables is significant, it also implies that each variable in the group is significant. NARRBEGIN: SA_116_118 The table below contains 5 years of monthly data on sales (number of units […]

NARRBEGIN: SA_83_86 A company produces two products. Each product can be produced on either of two machines. The time (in hours) required to produce each product on each machine is shown below: Each month, 600 hours of time are available […]

If two random samples of sizes 30 and 35 are selected independently from two populations whose means are 85 and 90, then the mean of the sampling distribution of the sample mean difference, , equals 5. Based on the histogram […]

NARRBEGIN: SA_113_116 A construction company is preparing for a nine-month project, and will need to develop a staffing plan. The company can assign up to 30 of its own full-time employees to the project, and will hire short-term contract employees […]

An estimator is said to be unbiased if the mean of its sampling distribution equals the value of the population parameter being estimated. NARRBEGIN: SA_121_124 A continuous random variable X has the probability density function: f(x) = 2 , 0 […]

The certainty equivalent is the certain dollar amount a risk-averse decision maker would accept in order to avoid a gamble altogether. The adjusted R2 is used primarily to monitor whether extra explanatory variables really belong in a multiple regression model […]

A car dealer collected the following information about a sample of 448 Grand Rapids residents: Exact salaries of these Grand Rapids residents Education level (completed high school only or completed college) Income level (low or high) Car finance (whether or […]

NARRBEGIN: SA_115_116 A used car salesman in a small town states that, on the average, it takes him 5 days to sell a car. Assume that the probability distribution of the length of time between sales is exponentially distributed. NARREND […]

In an ANOVA test, the alternative hypothesis is that at least one population mean is different from the others. If the sample is a good representation of the population, what percentage of the students in the population should we expect […]

NARRBEGIN: SA_79_90 The service manager for a new appliances store reviewed sales records of the past 20 sales of new microwaves to determine the number of warranty repairs he will be called on to perform in the next 90 days. […]

NARRBEGIN: SA_107_111 Suppose that the number of customers arriving each hour at the only checkout counter at a local convenience store is approximately Poisson distributed with an expected arrival rate of 30 customers per hour. Let X represent the number […]

An interval estimate is an interval calculated from the population data, where we strongly believe the true value of the population parameter lies. We compute the five-period moving averages for all time periods except the first two. Answer: F The […]

Four different shapes of histograms are commonly observed: symmetric, positively skewed, negatively skewed, and bimodal. NARRBEGIN: SA_79_81 In an effort to provide more consistent customer service, the manager of a local fast-food restaurant would like to know the dispersion of […]

The effect of a logarithmic transformation on a variable that is skewed to the right by a few large values is to “squeeze” the values together and make the distribution more symmetric The coefficients for logarithmically transformed explanatory variables should […]

We should include an interaction variable in a regression model if we believe that the effect of one explanatory variable on the response variable Y depends on the value of another explanatory variable . The purpose of using the moving […]

Suppose a company sells two different products, x and y, for net profits of $5 per unit and $10 per unit, respectively. The slope of the line representing the objective function is: a. 0.5 b. -0.5 c. 2 d. -2 […]

If Cov(X,Y) = – 16.0, variance of X = 25, variance of Y = 16 then the sample coefficient of correlation r is a. + 1.60 b. ” 1.60 c. ” 0.80 d. + 0.80 e. Cannot be determined from […]

When the error variance is nonconstant, it is common to see the variation increases as the explanatory variable increases (you will see a “fan shape” in the scatterplot). There are two ways you can deal with this phenomenon. These are: […]

A sample in which the sampling units are chosen from the population by means of a random mechanism is a a. probability sample b. judgmental sample c. stratified sample d. systematic sample Which of the following are true statements of […]

NARRBEGIN: SA_112_113 Adam Enterprises manufactures two products. Each product can be produced on either of two machines. The time (in hours) required to make each product on each machine is shown below: Each month, 500 hours of time are available […]

In order to generate random numbers in Excel from a discrete distribution with a finite number of possible values and corresponding probabilities, we can use a. only the RAND function b. only the VLOOKUP function c. only the VLOOKDOWN function […]

Potential sample members, called sampling units, are: a. people b. companies c. households d. All of these options Which of the following functions is not appropriate in cases where we run a single simulation? a. RISKMIN b. RISKMAX c. RISKPERCENTILE […]

The test statistic in a hypothesis test for a population proportion is a. t-value calculated from the sample b. z-value calculated from the sample c. F-value calculated from the sample d. the sample proportion NARRBEGIN: SA_100_102 A new online auction […]

NARRBEGIN: SA_80_83 A marketing research consultant hired by Coca-Cola is interested in determining if the proportion of customers who prefer Coke to other brands is over 50%. A random sample of 200 consumers was selected from the market under investigation, […]

Which of the following is true with regard to a good decision? a. It ensures that good outcomes will be obtained b. It accounts for unlucky outcomes c. It should be independent of the sequencing of uncertainties and decisions d. […]