Exam 3: Descriptive Statistics and Analytics: Numerical Methods

Researchers wish to study fuel consumption rates based on speed. The data from the test car at 10 speeds are below. It can be shown that for these data: = 41.9, = 17.8, = 2352.9, = 267.6, ( − ) = −270.2. Calculate b₁.

(Short Answer)

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Question 81

A correlation coefficient close to −1 says x and y are highly related.

(True/False)

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Question 82

Following a factor analysis of 15 personality characteristic ratings of politicians by a random sample of 40,000 registered voters, the following table of the first 7 factors and their corresponding eigenvalues and percentage of explained variation was produced. Which factors should an analyst choose when defining the characteristics of politicians?

(Short Answer)

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Question 83

In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the mean?

(Multiple Choice)

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Question 84

The ________ is the positive square root of the sample variance.

(Multiple Choice)

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Question 85

In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the 65th percentile?

(Multiple Choice)

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Question 86

Using Chebyshev's Theorem, find the interval that contains at least 93.75 percent of all measurements when the mean = 2.549 and s = 1.828.

(Multiple Choice)

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Question 87

When calculating the geometric mean, a quantity of 1 is added to the nth root of the product (1 + R₁)(1 + R₂) . . . (1 + R_n).

(True/False)

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Question 88

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 What is the first quartile?

(Multiple Choice)

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Question 89

The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 9. An airplane arrived 13 minutes after the stated arrival time. Calculate the z-score for the lateness of this particular airplane.

(Multiple Choice)

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Question 90

The following table shows the Price-to-Earnings ratio for a stereo equipment manufacturing company between 1998 and 2002. The annual percentage growth rate of the P/E ratios is also calculated and given below. Calculate the geometric mean growth rate increase or decrease over the period from 1998 to 2002.

(Multiple Choice)

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Question 91

At the end of 2007, the IRA owned by Joe Smith had a value of $1.2 million. With a rate of return of −29.75 percent in 2008 and a rate of return of 2.98 percent in 2009, calculate the geometric mean rate of return for the two-year period.

(Short Answer)

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Question 92

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 What are the lower and upper limits of a box-and-whiskers display of this data?

(Multiple Choice)

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Question 93

If the median of a data set is 760, the third quartile is 950, and the first quartile is 650, what is the interquartile range?

(Multiple Choice)

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Question 94

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mode?

(Multiple Choice)

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Question 95

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes). 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118 What is the IQR?

(Multiple Choice)

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Question 96

As the coefficient of variation , risk .

(Multiple Choice)

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Question 97

The median is the value below which and above which approximately 50 percent of the measurements lie.

(True/False)

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Question 98

In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the third quartile?

(Multiple Choice)

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Question 99

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the range?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 145

Researchers wish to study fuel consumption rates based on speed. The data from the test car at 10 speeds are below. It can be shown that for these data: = 41.9, = 17.8, = 2352.9, = 267.6, ( − ) = −270.2. Calculate b₁.

A correlation coefficient close to −1 says x and y are highly related.

In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the mean?

The ________ is the positive square root of the sample variance.

In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the 65th percentile?

Using Chebyshev's Theorem, find the interval that contains at least 93.75 percent of all measurements when the mean = 2.549 and s = 1.828.

When calculating the geometric mean, a quantity of 1 is added to the nth root of the product (1 + R₁)(1 + R₂) . . . (1 + R_n).

The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 9. An airplane arrived 13 minutes after the stated arrival time. Calculate the z-score for the lateness of this particular airplane.

At the end of 2007, the IRA owned by Joe Smith had a value of $1.2 million. With a rate of return of −29.75 percent in 2008 and a rate of return of 2.98 percent in 2009, calculate the geometric mean rate of return for the two-year period.

If the median of a data set is 760, the third quartile is 950, and the first quartile is 650, what is the interquartile range?

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mode?

As the coefficient of variation , risk .

The median is the value below which and above which approximately 50 percent of the measurements lie.

In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the third quartile?

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the range?

An Introduction to Business Statistics and Analytics

Descriptive Statistics and Analytics: Tabular and Graphical Methods

Probability and Probability Models

Predictive Analytics I: Trees, K-Nearest Neighbors, Naive Bayes,

Discrete Random Variables

Continuous Random Variables

Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Predictive Analytics Ii: Logistic Regression, Discriminate Analysis,

Time Series Forecasting and Index Numbers

Nonparametric Methods

Decision Theory

Filters

Exam 3: Descriptive Statistics and Analytics: Numerical Methods

Researchers wish to study fuel consumption rates based on speed. The data from the test car at 10 speeds are below. It can be shown that for these data: = 41.9, = 17.8, = 2352.9, = 267.6, ( − ) = −270.2. Calculate b1.

A correlation coefficient close to −1 says x and y are highly related.

In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the mean?

The ________ is the positive square root of the sample variance.

In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the 65th percentile?

Using Chebyshev's Theorem, find the interval that contains at least 93.75 percent of all measurements when the mean = 2.549 and s = 1.828.

When calculating the geometric mean, a quantity of 1 is added to the nth root of the product (1 + R1)(1 + R2) . . . (1 + Rn).

The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 9. An airplane arrived 13 minutes after the stated arrival time. Calculate the z-score for the lateness of this particular airplane.

At the end of 2007, the IRA owned by Joe Smith had a value of $1.2 million. With a rate of return of −29.75 percent in 2008 and a rate of return of 2.98 percent in 2009, calculate the geometric mean rate of return for the two-year period.

If the median of a data set is 760, the third quartile is 950, and the first quartile is 650, what is the interquartile range?

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mode?

As the coefficient of variation ________, risk ________.

The median is the value below which and above which approximately 50 percent of the measurements lie.

In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the third quartile?

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the range?

An Introduction to Business Statistics and Analytics

Descriptive Statistics and Analytics: Tabular and Graphical Methods

Probability and Probability Models

Predictive Analytics I: Trees, K-Nearest Neighbors, Naive Bayes,

Discrete Random Variables

Continuous Random Variables

Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Predictive Analytics Ii: Logistic Regression, Discriminate Analysis,

Time Series Forecasting and Index Numbers

Nonparametric Methods

Decision Theory

Filters

Researchers wish to study fuel consumption rates based on speed. The data from the test car at 10 speeds are below. It can be shown that for these data: = 41.9, = 17.8, = 2352.9, = 267.6, ( − ) = −270.2. Calculate b₁.

When calculating the geometric mean, a quantity of 1 is added to the nth root of the product (1 + R₁)(1 + R₂) . . . (1 + R_n).

As the coefficient of variation , risk .