MSIS 3223 - Nord - Okstate - Exam 2

What is the probability that a respondent is male and prefers arts?

2/15

which of the following is the weighted average of the squared deviations from the expected value?

variance

which of the following is a continuous random variable?

number of students in class

which of the following is true about probability density functions?

it calculates the probability of a random variable lying within a certain interval

which of the following is true of normal distributions?

mean, median, and mode are all equal

which of the following is true about the classical definition of probability?

if the process that generates the outcomes is known, probabilities can be deduced from theoretical arguments.

the _______ of a random variable corresponds to the notion of the mean, or average, of a sample.

expected value

A regression model that involves a single independent variable is called...

simple regression

regression models of _________ data focus on predicting the future

time series

Which of the following is true of linear functions used in predictive analytical models?

it is used when there is a steady decrease or increase over a range of a variable

In modeling relationships and trends, which one is used for cross-sectional data?

Scatter chart

In Excel's trendline tool, the value of the ______ gives the measure of fit of the line to the data.

R-squared

Which of the following is true about the observed errors associated with estimating the value of the dependent variable using the regression line?

the errors can be negative or positive

Which of the following is true when using the Excel Regression tool?

Checking the option Constant is Zero forces the intercept to zero

a linear regression model with more than one independent variable is called a.....

multiple linear regression

a(n) _________ is an extreme value that is different from the rest of the data.

outlier

In regression analysis, which of the following is used to determine whether an independent variable is significant?

P-value

in multiple regression, R Square is referred to as the....

coefficient of multiple determination

Interaction is...

the dependence between two variables

The Delphi method used for forecasting....

uses a panel of experts, whose identities are usually kept confidential from one another, to respond to a sequence of questionnaires.

Which of the following is true about variance?

in measure the uncertainty of a random variable

before launching a new line of toys, Toys inc used the method of historical analogy to obtain a forecast. In this scenario, Toys inc.....

noted the consumer response to similar previous products to market campaigns and used the responses as a basis to predict how the new marketing campaign might fare.

Time-series models may exhibit seasonal effects or cyclical effects. A seasonal effect differs from a cyclical effect in that a seasonal effect....

is one that repeats at fixed intervals over time, typically a year, month, week, or day

In forecasting, what is an index?

it is a single measure that weights multiple indicators and provides a measure of overall expectation

What is a stream of historical data known as?

a time series