File: ch09, Chapter 9: Statistical Inference: Hypothesis Testing for Single Populations
True/False
1. Hypotheses are statements about business phenomena known to be accurate and true.
Ans: False
Response: See section 9.1 Introduction to Hypothesis Testing
File: ch07, Chapter 7: Sampling and Sampling Distributions
True/False
1. In random sampling, the probability of a unit being selected for inclusion in the sample varies
from one unit of the population to another in a random way.
Ans: False
Response: See s
File: ch05, Chapter 5: Discrete Distributions
True/False
1. The number of defective items, X, in a batch of 100 items is unknown prior to inspection. X is
an example of a continuous random variable.
Ans: False
Response: See section 5.1 Discrete versus Con
File: ch08, Chapter 8: Statistical Inference: Estimation for Single Populations
True/False
1. A statistic taken from a sample that is used to estimate a population parameter is called
a point estimate.
Ans: True
Response: See section 8.1 Estimating the Po
File: ch11, Chapter 11: Analysis of Variance and Design of Experiments
True/False
1. A plan or a structure to test hypotheses in which the researcher either controls or
manipulates one or more variables is called an experimental design.
Ans: True
Response
File: ch14, Chapter 14: Building Multiple Regression Models
True/False
1. A multiple regression model in which the predictors are a variable and the square of the
variable is called a quadratic model.
Ans: True
Response: See section 14.1 Nonlinear Models:
File: ch02, Chapter 2: Charts and Graphs
True/False
1. Frequency distribution is a summary of data presented in the form of class intervals
and frequencies.
Ans: True
Response: See section 2.1 Frequency Distributions
Difficulty: Easy
2. The range of a dat
File: ch03, Chapter 3: Descriptive Statistics
True/False
1. Mean, mode, and median are measures of central tendency of ungrouped data.
Ans: True
Response: See section 3.1 Measures of Central Tendency: Ungrouped Data
Difficulty: Easy
2. The median is the m
File: ch13, Chapter 13: Multiple Regression Analysis
True/False
1. The process of constructing a mathematical model to predict or determine one variable by two
or more explanatory variables is called a compound regression analysis.
Ans: False
Response: Se
File: ch15, Chapter 15: Time-Series Forecasting and Index Numbers
True/False
1. Time-series data are data gathered at a given point in time.
Ans: False
Response: See section 15.1 Introduction to Forecasting
Difficulty: Easy
2. Time-series data that do not
File: ch04, Chapter 4: Probability
True/False
1. Probability of an uncertain outcome is a number between -1 and +1; if it is -1, the outcome
will never occur and if it is +1, it will certainly occur.
Ans: False
Response: See section 4.2 Methods of Assigni
File: ch12, Chapter 12: Simple Regression Analysis and Correlation
True/False
1. If the coefficient of correlation between two numerical variables is -1, it means that the two
variables are not related.
Ans: False
Response: See section 12.1 Correlation
Di
File: ch01, Chapter 1: Introduction to Statistics
True/False
1. Virtually every area of business uses statistics in decision making.
Ans: True
Response: See section 1.1 Statistics in Business
Difficulty: Easy
2. In business and economics, the term statist
File: ch19, Chapter 19: Decision Analysis Web Quiz
True/False
1. The various choices or options such as lay-off workers, maintaining the present work staff,
and hiring additional workers are examples of decision alternatives.
Ans: True
Response: See secti
File: ch18, Chapter 18: Statistical Quality Control
True/False
1. Quality is universally important to all people and all products or services, and hence,
there is a common definition of quality.
Ans: False
Response: See section 18.1 Introduction to Qualit
File: ch17, Chapter 17: Nonparametric Statistics
True/False
1. Nonparametric statistics are based on fewer assumptions about the population and its
parameters than are parametric statistics.
Ans: True
Response: See section 17.0
Difficulty: Easy
2. If the
File: ch16, Chapter 16: Analysis of Categorical Data
True/False
1. The chi-square distribution is continuous and has a range between minus infinity and
plus infinity.
Ans: False
Response: See section 16.1 Chi-Square Goodness-of-Fit Test
Difficulty: Easy
2
File: ch10, Chapter 10: Statistical Inferences about Two Populations
True/False
1. To test if the means of two populations are different, we test the significance of the difference
between two sample means.
Ans: True
Response: See section 10.1 Hypothesis
File: ch06, Chapter 6: Continuous Distributions
True/False
1. Probabilities from the uniform distribution are determined by calculating the height of
the distribution.
Answer: False
Response: See section 6.1 The Uniform Distribution
Difficulty: Easy
2. In