Liz Chapa manages a portfolio of 250 common stocks.Her staff compiled the following performance statistics for two new stocks. $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $$\text { Rate of Return }$ \[\begin{array} { | l | l | l | } \hline { \text { Stock } } & \\ & \text { Mearn } & \text { Starndard Deviation } \\ \hline \text { Salas Products, Inc. } & 15 \% & 5 \% \\ \hline \text { Hot Boards, Inc. } & 20 \% & 5 \% \\ \hline \end{array}\] The coefficient of variation for Salas Products, Inc.is __________.

A) 300% B) 100% C) 33% D) 5% E) 23% A) 300% B) 100% C) 33% D) 5% E) 23%

Liz Chapa manages a portfolio of 250 common stocks.Her staff compiled the following performance statistics for two new stocks. $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $ $\quad $$\text { Rate of Return }$ \[\begin{array} { | l | l | l | } \hline { \text { Stock } } & \\ & \text { Mearn } & \text { Starndard Deviation } \\ \hline \text { Salas Products, Inc. } & 15 \% & 5 \% \\ \hline \text { Hot Boards, Inc. } & 20 \% & 5 \% \\ \hline \end{array}\] The coefficient of variation for Hot Boards, Inc.is __________.

A) 400% B) 100% C) 33% D) 40% E) 25% A) 400% B) 100% C) 33% D) 40% E) 25%

Exam 3: Descriptive Statistics

A statistics student made the following grades on the first 6 tests: 76, 82, 92, 95, 79, 86.The total number of tests for the semester is 7.What could be her median score for the whole semester?

(Multiple Choice)

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Question 21

A business analyst is considering a data set reflecting the number of products purchased at one time, there is a mean of 159 and a standard deviation of 43.2.Given that the data set the number of products purchased for 5,791 purchases and is mound shaped, the analyst would expect 68% of the data points to be ________.

(Multiple Choice)

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Question 22

The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 50 hours.It can be concluded that at least 89% of this brand of bulbs will last between _______.

(Multiple Choice)

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Question 23

According to Chebyshev's Theorem, approximately how many values in a large data set will be within 2 standard deviations of the mean?

(Multiple Choice)

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Question 24

The average starting salary for graduates at a university is $33,000 with a standard deviation of $2,000.If a histogram of the data shows that it takes on a mound shape, the empirical rule says that approximately 95% of the graduates would have a starting salary between _______.

(Multiple Choice)

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Question 25

Liz Chapa manages a portfolio of 250 common stocks.Her staff compiled the following performance statistics for two new stocks. $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\text { Rate of Return }$ Stock Mearn Starndard Deviation Salas Products, Inc. 15\% 5\% Hot Boards, Inc. 20\% 5\% The coefficient of variation for Salas Products, Inc.is __________.

(Multiple Choice)

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Question 26

A commuter travels many miles to work each morning.She has timed this trip 5 times during the last month.The time (in minutes)required to make this trip was 44, 39, 41, 35, and 41.What is the standard deviation for these sample data?

(Multiple Choice)

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Question 27

A statistics student has a mean score of 92 in the first 3 tests.Suppose there are a total of 4 tests and all of them have equal weight.You can also assume that there is no extra credit in the last test.What is the best possible final average this student can get?

(Multiple Choice)

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Question 28

The average of the squared deviations about the arithmetic mean is called the variance.

(True/False)

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Question 29

A box-and-whisker plot for last year's data is compared with a box-and-whisker plot for this year's data.The biggest change is that the median is moved from the left side of the box to the right side of the box.The other elements of the plot remained fairly constant.Based on this change, it can be concluded that ___________.

(Multiple Choice)

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Question 30

The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 75 hours.Tests show that the life of the bulb is approximately normally distributed.It can be concluded that approximately 68% of the bulbs will last between _______.

(Multiple Choice)

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Question 31

The average starting salary for graduates at a university is $33,000 with a standard deviation of $2,000.If a histogram of the data shows that it takes on a mound shape, the empirical rule says that approximately 68% of the graduates would have a starting salary between _______.

(Multiple Choice)

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Question 32

Jessica Salas, President of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries.Life tests performed on a sample of 100 batteries indicated: (1)an average life of 75 months, (2)a standard deviation of 5 months, and (3)a bell-shaped battery life distribution.What percentage of the batteries will fail within the first 65 months of use?

(Multiple Choice)

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Question 33

The sample standard deviation is calculated by taking the square root of the population standard deviation.

(True/False)

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Question 34

If the mean, median, and mode are equal, then the distribution is positively skewed.

(True/False)

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Question 35

A statistics student made the following grades on 7 tests: 76, 82, 92, 95, 79, 86, and 92.What is the mode?

(Multiple Choice)

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Question 36

A sample was taken of the salaries of four employees from a large company.The following are their salaries (in thousands of dollars)for this year: 33, 36, 41, and 47.The variance of their salaries is approximately

(Multiple Choice)

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Question 37

Liz Chapa manages a portfolio of 250 common stocks.Her staff compiled the following performance statistics for two new stocks. $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\text { Rate of Return }$ Stock Mearn Starndard Deviation Salas Products, Inc. 15\% 5\% Hot Boards, Inc. 20\% 5\% The coefficient of variation for Hot Boards, Inc.is __________.

(Multiple Choice)

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Question 38

It is inappropriate to use the mean to analyze data that are not at least interval level in measurement.

(True/False)

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Question 39

The sum of deviations about the arithmetic mean for a given set of data is always equal to zero.

(True/False)

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Question 40

Showing 21 - 40 of 88

A statistics student made the following grades on the first 6 tests: 76, 82, 92, 95, 79, 86.The total number of tests for the semester is 7.What could be her median score for the whole semester?

The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 50 hours.It can be concluded that at least 89% of this brand of bulbs will last between _______.

According to Chebyshev's Theorem, approximately how many values in a large data set will be within 2 standard deviations of the mean?

The average starting salary for graduates at a university is $33,000 with a standard deviation of $2,000.If a histogram of the data shows that it takes on a mound shape, the empirical rule says that approximately 95% of the graduates would have a starting salary between _______.

A commuter travels many miles to work each morning.She has timed this trip 5 times during the last month.The time (in minutes)required to make this trip was 44, 39, 41, 35, and 41.What is the standard deviation for these sample data?

A statistics student has a mean score of 92 in the first 3 tests.Suppose there are a total of 4 tests and all of them have equal weight.You can also assume that there is no extra credit in the last test.What is the best possible final average this student can get?

The average of the squared deviations about the arithmetic mean is called the variance.

The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 75 hours.Tests show that the life of the bulb is approximately normally distributed.It can be concluded that approximately 68% of the bulbs will last between _______.

The average starting salary for graduates at a university is $33,000 with a standard deviation of $2,000.If a histogram of the data shows that it takes on a mound shape, the empirical rule says that approximately 68% of the graduates would have a starting salary between _______.

The sample standard deviation is calculated by taking the square root of the population standard deviation.

If the mean, median, and mode are equal, then the distribution is positively skewed.

A statistics student made the following grades on 7 tests: 76, 82, 92, 95, 79, 86, and 92.What is the mode?

A sample was taken of the salaries of four employees from a large company.The following are their salaries (in thousands of dollars)for this year: 33, 36, 41, and 47.The variance of their salaries is approximately

It is inappropriate to use the mean to analyze data that are not at least interval level in measurement.

The sum of deviations about the arithmetic mean for a given set of data is always equal to zero.

Introduction to Statistics and Business Analytics

Visualizing Data With Charts and Graphs

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

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