Question 1

A treatment that has no active ingredients is a(n)

Accepted Answer

A) confounding treatment 
B) experimental treatment 
C) placebo treatment 
D) observational treatment 
E) biased treatment 
A) confounding treatment 
B) experimental treatment 
C) placebo treatment 
D) observational treatment 
E) biased treatment

Question 2

Accepted Answer

The answer of  ...

Question 3

The term used to describe the bias that occurs if some segment of a population is systematically excluded from a sample is

Accepted Answer

A) selection bias 
B) measurement bias 
C) response bias 
D) exclusion bias 
E) visibility bias 
A) selection bias 
B) measurement bias 
C) response bias 
D) exclusion bias 
E) visibility bias

Question 4

A point is called an influential point if:

Accepted Answer

A) it has a residual with a large absolute value compared to se . 
B) it has a residual with a large absolute value compared to the mean residual. 
C) it plays a large role in determining the slope of the least squares line. 
D) it plays a small role in determining the correlation coefficient. 
E) it plays a large role in determining the coefficient of determination. 
A) it has a residual with a large absolute value compared to se . 
B) it has a residual with a large absolute value compared to the mean residual. 
C) it plays a large role in determining the slope of the least squares line. 
D) it plays a small role in determining the correlation coefficient. 
E) it plays a large role in determining the coefficient of determination.

Question 5

Use the following information for questions 
One thousand students at a city high school were classified both according to GPA and
whether or not they consistently skipped classes.Here are the breakdowns:  
-What is the probability that a randomly selected student has a GPA under 2.0 and has consistently skipped classes?

Accepted Answer

A) 0.080 
B) 0.281 
C) 0.285 
D) 0.314 
E) 0.727 
A) 0.080 
B) 0.281 
C) 0.285 
D) 0.314 
E) 0.727

Question 6

When constructing a 95% confidence interval, the confidence level is:

Accepted Answer

The answer of When constructing a 95% confidence interval, the...

Question 7

The sampling frame is the

Accepted Answer

A) list of all elements in a population. 
B) boundary of a stratum. 
C) fraction of inclusion in a systematic sample. 
D) the basic plan for taking a simple random sample. 
E) the set of individuals in the sample, if one per strata is sampled. 
A) list of all elements in a population. 
B) boundary of a stratum. 
C) fraction of inclusion in a systematic sample. 
D) the basic plan for taking a simple random sample. 
E) the set of individuals in the sample, if one per strata is sampled.

Question 8

A characteristic whose value may change from one individual to another is a:

Accepted Answer

A) variable 
B) data point 
C) factor 
D) measurement 
E) statistic 
A) variable 
B) data point 
C) factor 
D) measurement 
E) statistic

Question 9

Accepted Answer

A) 16 and 25 
B) 12 and 30 
C) 12 and 18 
D) 12, 17, 16, and 18 
E) 12, 13, 30, and 25 
A) 16 and 25 
B) 12 and 30 
C) 12 and 18 
D) 12, 17, 16, and 18 
E) 12, 13, 30, and 25

Question 10

The proportion of values in a normal population distribution that fall within 2 standard deviations of the mean is:

Accepted Answer

The answer of The proportion of values in a normal...

Question 11

Accepted Answer

The answer of    ...

Question 12

An experiment is a planned intervention undertaken to observe the effects of

Accepted Answer

A) confounding variables. 
B) explanatory variables. 
C) experimental design as a whole. 
D) extraneous factors. 
E) blocking factors. 
A) confounding variables. 
B) explanatory variables. 
C) experimental design as a whole. 
D) extraneous factors. 
E) blocking factors.

Question 13

The fit of the data indicates that on average the estimates of the logs of the proportion returning are declining as the logarithm of the distance increases. The number in the table that indicates this is:

Accepted Answer

A) the slope of the regression line 
B) the intercept of the regression line 
C) the RSquare 
D) the Adjusted RSquare 
E) the t-ratio of the LogDist 
A) the slope of the regression line 
B) the intercept of the regression line 
C) the RSquare 
D) the Adjusted RSquare 
E) the t-ratio of the LogDist

Question 14

Accepted Answer

The answer of  ...

Question 15

In a randomized block design with 4 treatments and 3 blocks there are

Accepted Answer

A) 4 degrees of freedom for treatments, 3 for blocks and 12 for error. 
B) 3 degrees of freedom for treatments, 3 for blocks and 9 for error. 
C) 3 degrees of freedom for treatments, 2 for blocks and 5 for error. 
D) 3 degrees of freedom for treatments, 2 for blocks and 6 for error. 
E) 4 degrees of freedom for treatments, 2 for blocks and 6 for error. 
A) 4 degrees of freedom for treatments, 3 for blocks and 12 for error. 
B) 3 degrees of freedom for treatments, 3 for blocks and 9 for error. 
C) 3 degrees of freedom for treatments, 2 for blocks and 5 for error. 
D) 3 degrees of freedom for treatments, 2 for blocks and 6 for error. 
E) 4 degrees of freedom for treatments, 2 for blocks and 6 for error.

Question 16

The slope of the regression line and the correlation between two variables is related in the following way:

Accepted Answer

A) The slope is always greater in absolute value than the correlation. 
B) The slope and correlation must be of the same sign. 
C) The slope and correlation must be of different sign. 
D) The slope is always less in absolute value than the correlation. 
E) None of (a)- (d)is necessarily true. 
A) The slope is always greater in absolute value than the correlation. 
B) The slope and correlation must be of the same sign. 
C) The slope and correlation must be of different sign. 
D) The slope is always less in absolute value than the correlation. 
E) None of (a)- (d)is necessarily true.

Question 17

In a study of male / female differences in carnivores, the height of the canine teeth in the
lower jaws were measured.The data below are graphic representations of these data.
Use these graphs to answer questions below.  
-The median of the lower canine tooth heights is:

Accepted Answer

The answer of In a study of male / female...

Question 18

The single number in the computer output above that will indicate whether the null hypothesis should be rejected at the .05 level is:

Accepted Answer

The answer of The single number in the computer output...

Question 19

A huge trucking firm determines that its fleet of trucks averages a mean of 12.4 miles per gallon with a standard deviation of 1.2 miles per gallon on cross-country hauls. The distribution of miles per gallon is approximately normally distributed.What is the probability that a randomly selected truck averages fewer than 10 miles per gallon?

Accepted Answer

A) 0.0082 
B) 0.0228 
C) 0.4772 
D) 0.5228 
E) 0.9772 
A) 0.0082 
B) 0.0228 
C) 0.4772 
D) 0.5228 
E) 0.9772

Question 20

In polling voter opinions about a school bond issue, two groups randomly sampled the population of River City.Both polls agree that the proportion of voters' who say they would vote "yes" is 0.84.However, the school district's research dept reports a margin of error of .025, while a citizens' group reports a margin of error of .03. Which of the reasons below, if any, might explain this discrepancy?

Accepted Answer

A) The citizens' group is reporting with a smaller confidence level. 
B) The citizens' group is reporting with a larger sample size. 
C) The citizens' group has a smaller estimated standard error. 
D) The citizens' group has a larger point estimate of π. 
E) None of the above would account for this discrepancy. 
A) The citizens' group is reporting with a smaller confidence level. 
B) The citizens' group is reporting with a larger sample size. 
C) The citizens' group has a smaller estimated standard error. 
D) The citizens' group has a larger point estimate of π. 
E) None of the above would account for this discrepancy.

A treatment that has no active ingredients is a(n)

The term used to describe the bias that occurs if some segment of a population is systematically excluded from a sample is

A point is called an influential point if:

When constructing a 95% confidence interval, the confidence level is:

The sampling frame is the

A characteristic whose value may change from one individual to another is a:

The proportion of values in a normal population distribution that fall within 2 standard deviations of the mean is:

An experiment is a planned intervention undertaken to observe the effects of

The fit of the data indicates that on average the estimates of the logs of the proportion returning are declining as the logarithm of the distance increases. The number in the table that indicates this is:

In a randomized block design with 4 treatments and 3 blocks there are

The slope of the regression line and the correlation between two variables is related in the following way:

In a study of male / female differences in carnivores, the height of the canine teeth in the lower jaws were measured.The data below are graphic representations of these data. Use these graphs to answer questions below. -The median of the lower canine tooth heights is:

The single number in the computer output above that will indicate whether the null hypothesis should be rejected at the .05 level is:

The Role of Statistics and the Data Analysis Process

Collecting Data Sensibly

Graphical Methods for Describing Data

Numerical Methods for Describing Data

Summarizing Bivariate Data

Probability

Random Variables and Probability Distributions

Sampling Variability and Sampling Distributions

Estimation Using a Single Sample

Hypothesis Testing Using a Single Sample

Comparing Two Populations or Treatments

The Analysis of Categorical Data and Goodness-Of-Fit Tests

Simple Linear Regression and Correlation: Inferential Methods

Multiple Regression Analysis

Analysis of Variance

Filters

Exam 17: Statistics and Probability Questions

A treatment that has no active ingredients is a(n)

The term used to describe the bias that occurs if some segment of a population is systematically excluded from a sample is

A point is called an influential point if:

When constructing a 95% confidence interval, the confidence level is:

The sampling frame is the

A characteristic whose value may change from one individual to another is a:

The proportion of values in a normal population distribution that fall within 2 standard deviations of the mean is:

An experiment is a planned intervention undertaken to observe the effects of

The fit of the data indicates that on average the estimates of the logs of the proportion returning are declining as the logarithm of the distance increases. The number in the table that indicates this is:

In a randomized block design with 4 treatments and 3 blocks there are

The slope of the regression line and the correlation between two variables is related in the following way:

In a study of male / female differences in carnivores, the height of the canine teeth in the lower jaws were measured.The data below are graphic representations of these data. Use these graphs to answer questions below. -The median of the lower canine tooth heights is:

The single number in the computer output above that will indicate whether the null hypothesis should be rejected at the .05 level is:

The Role of Statistics and the Data Analysis Process

Collecting Data Sensibly

Graphical Methods for Describing Data

Numerical Methods for Describing Data

Summarizing Bivariate Data

Probability

Random Variables and Probability Distributions

Sampling Variability and Sampling Distributions

Estimation Using a Single Sample

Hypothesis Testing Using a Single Sample

Comparing Two Populations or Treatments

The Analysis of Categorical Data and Goodness-Of-Fit Tests

Simple Linear Regression and Correlation: Inferential Methods

Multiple Regression Analysis

Analysis of Variance

Filters