Deck 5: Statistics

Question 1

All of the following are the components of the multiple regression model EXCEPT:

A)slopes of trend lines
B)correlation coefficients
C)random error terms
D)intercept

Answer 1

correlation coefficients

Question 2

What is the mean for the following expenditures? $79.84, $278.99, $342.16, $466.25, $111.39, $502.47, $98.12

A)$278.99
B)$268.46
C)$354.22
D)$317.54

Answer 2

$268.46

Question 3

A significant limitation of regression analysis is:

A)an incomplete understanding of the relationship between the independent and dependent variable
B)an incomplete understanding of the relationship between the slope and the random error term
C)an incomplete understanding of the relationship between the slope and the intercept
D)an incomplete understanding of the relationship between the intercept and the random error term

Answer 3

an incomplete understanding of the relationship between the slope and the random error term

Question 4

A Sprint Telecom executive believes customers in a market segment are in their late 20s. He chooses and studies a sample of cell phone users with a mean age of 28 years when in fact, the population mean is 38 years. The probability of a Type II error increases as you:

A)set the probability of the wrong population parameter higher
B)set the probability of the wrong population parameter lower
C)set the probability of a Type I error higher
D)set the probability of a Type I error lower

Question 5

A biomedical company is studying whether its knee joint replacement is causing nerve damage. After extensive tests, the researchers make an erroneous decision, concluding that the replacement does cause nerve damage. A Type I error is the probability of?

A)rejecting the alternative hypothesis when it is true
B)rejecting the null hypothesis when it is true
C)accepting the null hypothesis when it is true
D)accepting the alternative hypothesis when it is true

Question 6

Quality control at a software production assembly line chooses samples for study from every 25 units produced within the day shift. At the end of a single production cycle, they are expected to analyze 200 units for defects. What is this type of sampling called?

A)probability
B)non-probability
C)convenience
D)judgment

Question 7

Jason's company manufactures parts for large car producers such as Toyota and Honda. Management at his company is committed to continuous improvement in manufacturing standards and practices through rigorous training. What is the name of this practice?

A)Kaiser
B)error-proofing
C)Kaizen
D)teamwork

Question 8

Executives at a national mining company insist that their employees did not contract lung cancer from occupational pollutants. They develop a regression model that shows 67% of the lung cancers reported are due to other factors such as personal smoking and genetic predisposition. The random error term in the linear regression model indicates:

A)a numerical estimate of the relationship between the independent and dependent variables
B)a numerical estimate of factors outside the independent variable
C)a numerical estimate of factors outside the dependent variable
D)a numerical estimate of the relationship between the intercept and the slope

Question 9

An Entertainment consulting agency wishes to study the effect of salary bonuses on employee performance. Specifically, they wish to find out if an annual bonus increases the number of signed clients. What does employee performance represent, in this case?

A)research question
B)independent variable
C)dependent variable
D)research design

Question 10

NEC launches a new TV set in Washington State in 2008 with a limited release. Company executives are interested in tracking sales' patterns in order to make production decisions for the following year. What graphical tool can display sales figures by month?

A)histogram
B)run chart
C)CTQ tree
D)process map

Question 11

Kroger's grocery stores in Houston are interested in gauging the response of weekend managers to door promotions. By selecting specific managers, what sampling method are executives using in their research?

A)convenience sampling
B)stratified sampling
C)simple random sampling
D)judgment sampling

Question 12

JC Penney is a large retailer with hundreds of outlets across the United States. An executive manager is interested in how promotional spending affects quarterly sales figures in North Carolina where sales have been dismal in a number of quarters. Her hypothesis is that promotional spending does not affect quarterly sales in North Carolina. What is a null hypothesis in a research study based upon?

A)educated guess about a population study
B)educated guess about a sample study
C)educated guess about a population parameter
D)educated guess about a sample statistic

Question 13

Jackson's team is choosing participants for his marketing research from a list of customers. They decide to choose every 7^th name in a list of telephone numbers within the directory. What is this type of sampling referred to?

A)stratified
B)systematic
C)simple random
D)judgment

Question 14

Quantitative research methods involve the measurement and analysis of data. All of the following are examples of quantitative methods EXCEPT:

A)case study
B)survey
C)questionnaire
D)experiment

Question 15

In regression analysis, the following assumptions are made EXCEPT:

A)linearity
B)homoscedasticity
C)normality of errors
D)dependence of errors

Question 16

The given numbers are daily groundwater elevation readings from a monitoring well taken during a month experiencing snowmelt and extended rainfall events. 7.6, 7.7, 4.3, 5.9, 5.0, 10.5, 7.7, 9.5, 12.0, 12.6, 6.5, 8.3, 8.2, 13.2, 12.6, 13.6, 14.1, 13.5, 11.5, 12.0, 10.4, 10.8, 13.1, 12.5, 10.4, 13.0, 14.1, 15.1
What is the standard deviation of these groundwater elevation readings?

A) 3.01
B) 4.15
C) 9.08
D)None of the above.

Question 17

Kruger's grocery chain asks customer during their Saturday shopping if they would fill out surveys. In return, they offer them in-store savings. Customers are chosen randomly and the overall sample numbers depends on customer compliance. What is this type of sampling referred to?

A)stratified
B)judgment
C)cluster
D)convenience

Question 18

What are the advantages of using the Least Squares Method rather than the Compass Rule adjustment to address traverse closure errors?

A)The least squares method results in a weighted means adjustment.
B)The least squares method may be used to adjust any type of data to meet geometric conditions and reflect statistical considerations.
C)Free computer software programs are readily available to solve complex equations.
D)All of the above

Question 19

In linear regression, the total variation explained by the variation attributable to the relationship between X (the independent variable) and Y (the dependent variable). Unexplained variation is attributable to factors outside of X. What is this variation called?

A)total sum of squares
B)regression sum of squares
C)linear sum of squares
D)error sum of squares

Question 20

Given a data set of high performing sales numbers from a population of 2000 sales people across a national company, how is a sampling error calculated?

A)subtracting the sample statistic from the population parameter
B)subtracting the population parameter from the sample statistic
C)subtracting the sample mean from the data value
D)subtracting the data value from the sample mean

Question 21

Jeffrey is a real estate agent who wishes to study the relationship between the selling price of a house and its size (measured in feet) in Manhattan. He develops a simple linear regression model as seen below. What is the slope of the model? Houseprice = 95.5 + 0.25 (square feet) + 13

A)95.5
B) 0.25
C)13
D) 4.5

Question 22

The following is a multiple regression model. What do the regression coefficients b₁ and b₂ represent? Y _i= b₀ + b₁X_1i + b₂X_2i +e_i

A)slopes of independent variables
B)slopes of dependent variables
C)random error term
D)graph intercept

Question 23

State officials wish to study those factors that affect adherence to job rehabilitation after a job-related injury. The propose to study two particular factors: the extent of previous injury and the worker's educational level. What is this type of research design called?

A)simple linear regression
B)multiple regression
C)ANOVA
D)chi-square

Question 24

The given numbers are daily groundwater elevation readings from a monitoring well taken during a month experiencing snowmelt and extended rainfall events.
7.6, 7.7, 4.3, 5.9, 5.0, 10.5, 7.7, 9.5, 12.0, 12.6, 6.5, 8.3, 8.2, 13.2, 12.6, 13.6, 14.1, 13.5, 11.5, 12.0, 10.4, 10.8, 13.1, 12.5, 10.4, 13.0, 14.1, 15.1
What is the sample variance of these groundwater elevation readings?

A) 8.764
B) 9.089
C) 10.56
D) None of the above

Question 25

Rogers Telemarketing provides direct marketing campaigns for small and medium sized businesses. To select populations for survey purposes, the company seeks data sources such as phone books and consumer lists. These sources are also referred to as:

A)sampling medium
B)sampling lists
C)sampling frame
D)sampling methodology