In its Industry Norms and Key Business Ratios,Dun & Bradstreet reported that Q1,Q2,and Q3 for 2,037 gasoline service stations' sales to inventory ratios were 20.8,33.4,and 53.8,respectively. From this we can conclude that ____________.

A) 68% of these service stations had sales to inventory ratios of 20.8 or less B) 50% of these service stations had sales to inventory ratios of 33.4 or less C) 50% of these service stations had sales to inventory ratios of 53.8 or more D) 95% of these service stations had sales to inventory ratios of 33.4 or more E) 99% of these service stations had sales to inventory ratios of 53.8 or more A) 68% of these service stations had sales to inventory ratios of 20.8 or less B) 50% of these service stations had sales to inventory ratios of 33.4 or less C) 50% of these service stations had sales to inventory ratios of 53.8 or more D) 95% of these service stations had sales to inventory ratios of 33.4 or more E) 99% of these service stations had sales to inventory ratios of 53.8 or more

Exam 3: Descriptive Statistics

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 median of their salaries is approximately

(Multiple Choice)

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Question 41

Shaun Connor,Human Resources Manager forAmerican Oil Terminals (AOT),is reviewing the operator training hours at AOT nationally. His staff compiled the following table of national statistics on operators training hours. What can Shaun conclude from these statistics?

(Multiple Choice)

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Question 42

The following frequency distribution was constructed for the wait times in the emergency room. The frequency distribution reveals that the wait times in the emergency room are _______.

(Multiple Choice)

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Question 43

David Desreumaux,VP of Human Resources of American First Banks (AFB),is reviewing the employee training programs of AFB banks. His staff reports several statistics for teller training hours. The mean is 20 hours,the standard deviation is 5 hours,the median is 15 hours,and mode is 10 hours.The Pearsonian coefficient of skewness-or Pearson's second skewness coefficient,defined as (3 × (μ - median)/σ)-for teller training hours is __________.

(Multiple Choice)

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Question 44

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 45

David Desreumaux,VP of Human Resources of American First Banks (AFB),is reviewing the employee training programs of AFB banks. His staff compiled the following table of regional statistics on teller training hours. What can David conclude from these statistics?

(Multiple Choice)

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Question 46

An outlier of a data set is determined from the lower and upper quartile

(True/False)

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Question 47

The ages of students in a class have been put into the frequency distribution below. What is the average age of these students?

(Multiple Choice)

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Question 48

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 49

The most appropriate measure of central tendency for nominal-level data is the median.

(True/False)

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Question 50

In its Industry Norms and Key Business Ratios,Dun & Bradstreet reported that Q₁,Q₂,and Q₃ for 2,037 gasoline service stations' sales to inventory ratios were 20.8,33.4,and 53.8,respectively. From this we can conclude that ____________.

(Multiple Choice)

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Question 51

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 52

The empirical rule says that approximately what percentage of the values would be within 2 standard deviations of the mean in a bell shaped set of data?

(Multiple Choice)

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Question 53

An instructor is evaluating the performance of students on a test. He records the number of points that each student missed and created a frequency distribution. This is provided below: What is the mean number of points missed?

(Multiple Choice)

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Question 54

Average deviation is a common measure of the variability of data containing a set of numbers.

(True/False)

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Question 55

Your company is testing a new auto engine in a race car.The race car is going in a 2-mile track.If the first lap was exactly at 2 minutes,so that the average speed for the first lap was 1.00 mile per minute,what would be the time required for the second lap so that the overall average speed will be 2 miles per minute?

(Multiple Choice)

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Question 56

The ages of the machines in one of the production lines in your company are exhibited in the frequency distribution table below. What is the minimum number of 6-year-old machines that you need to retire to change the median age of the machines?

(Multiple Choice)

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Question 57

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 58

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.Approximately 99.7% of the batteries will last between ________________.

(Multiple Choice)

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Question 59

If the median of a distribution is greater than mean,then the distribution is skewed to the left.

(True/False)

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Question 60

Showing 41 - 60 of 81

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 median of their salaries is approximately

Shaun Connor,Human Resources Manager forAmerican Oil Terminals (AOT),is reviewing the operator training hours at AOT nationally. His staff compiled the following table of national statistics on operators training hours. What can Shaun conclude from these statistics?

The following frequency distribution was constructed for the wait times in the emergency room. The frequency distribution reveals that the wait times in the emergency room are _______.

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 _______.

David Desreumaux,VP of Human Resources of American First Banks (AFB),is reviewing the employee training programs of AFB banks. His staff compiled the following table of regional statistics on teller training hours. What can David conclude from these statistics?

An outlier of a data set is determined from the lower and upper quartile

The ages of students in a class have been put into the frequency distribution below. What is the average age of these students?

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 most appropriate measure of central tendency for nominal-level data is the median.

In its Industry Norms and Key Business Ratios,Dun & Bradstreet reported that Q₁,Q₂,and Q₃ for 2,037 gasoline service stations' sales to inventory ratios were 20.8,33.4,and 53.8,respectively. From this we can conclude that ____________.

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 _______.

The empirical rule says that approximately what percentage of the values would be within 2 standard deviations of the mean in a bell shaped set of data?

An instructor is evaluating the performance of students on a test. He records the number of points that each student missed and created a frequency distribution. This is provided below: What is the mean number of points missed?

Average deviation is a common measure of the variability of data containing a set of numbers.

The ages of the machines in one of the production lines in your company are exhibited in the frequency distribution table below. What is the minimum number of 6-year-old machines that you need to retire to change the median age of the machines?

If the median of a distribution is greater than mean,then the distribution is skewed to the left.

Introduction to Statistics

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

A Nalysis 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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