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business
business statistics communicating

Questions and Answers of Business Statistics Communicating

Thirty people were given an employment screening test, which is supposed to produce scores that are distributed according to a bell-shaped distribution. The following data reflect the scores of those
Suppose mortgage interest tax deductions average$8,268 for people with incomes between $50,000 and$200,000 and $365 for those with incomes of $40,000 to $50,000. Suppose also the standard deviations
Lockheed Martin is a supplier for the aerospace industry. Suppose Lockheed is considering switching to Cirus Systems, Inc., a new supplier for one of the component parts it needs for an assembly. At
The Jones and McFarlin Company provides call center support for a number of electronics manufacturers.Customers call in to receive assistance from a live technician for the products they have
The owner of a clothes store wants to determine whether salespeople make more sales if they spend more time with customers. She randomly selects two salespersons from her shop and records the times
Consider the following population:71 89 65 97 46 52 99 41 62 88 73 50 91 71 52 86 92 60 70 91 73 98 56 80 70 63 55 61 40 95a. Determine the mean and variance.b. Determine the percentage of data
Consider the following sample:22 46 25 37 35 84 33 54 80 37 76 34 48 86 41 13 49 45 62 47 72 70 91 51 91 43 56 25 12 65a. Calculate the mean and standard deviation for this data.b. Determine the
The following data represent random samples taken from two different populations, A and B:A 31 10 69 25 62 61 46 74 57 B 1,030 1,111 1,155 978 943 983 932 1,067 1,013a. Compute the mean and standard
If a sample mean is 1,000 and the sample standard deviation is 250, determine the standardized value fora. x = 800b. x = 1,200c. x = 1,000
Given two distributions with the following characteristics:Distribution A Distribution B m = 45,600 m = 33.40 s = 6,333 s = 4.05 If a value from Distribution A is 50,000 and a value from Distribution
Two distributions of data are being analyzed.Distribution A has a mean of 500 and a standard deviation equal to 100. Distribution B has a mean of 10 and a standard deviation equal to 4.0. Based on
You are given the following parameters for two populations:Population 1 Population 2 m = 700 m = 29,000 s = 50 s = 5,000a. Compute the coefficient of variation for each population.b. Based on the
Consider the following set of sample data:78 121 143 88 110 107 62 122 130 95 78 139 89 125a. Compute the mean and standard deviation for these sample data.b. Calculate the coefficient of variation
The mean time that a certain model of light bulb will last is 400 hours, with a standard deviation equal to 50 hours.a. Calculate the standardized value for a light bulb that lasts 500 hours.b.
A population of unknown shape has a mean of 3,000 and a standard deviation of 200.a. Find the minimum proportion of observations in the population that are in the range 2,600 to 3,400.b. Determine
Efficient Hiring, Inc., assists companies in hiring people to fill jobs. The file called Hired contains data on a sample of the placements made by the company.The two variables in the file are the
The placement center at a southern university tracks starting salaries. The data file called BI SALARIES lists the starting salaries for the 25 graduates in Information Technology who completed one
Suppose there is an investigation to determine whether the increased availability of generic drugs, Internet drug purchases, and cost controls have reduced out-ofpocket drug expenses. As a part of
The First City Real Estate Company managing partner asked the office administrator to provide a descriptive analysis of the asking prices of the homes the company currently has listed. This list
The file MBA Analysis contains data on several variables for eight MBA graduates. The variables include pre– and post–MBA salary, percentage salary increase, undergraduate GPA, average GMAT
The manager of a cell phone store in the Valley Mall recently collected data on a sample of 50 customers who purchased a cell phone and a monthly call plan.The data she recorded are in the data file
A bus company provides shuttle bus services for a university from 6 a.m. to 8 p.m. Each passenger pays$1 for a ride. The company decides to adjust the fee based on variations in the numbers of
Employers typically provide Internet access to assist employees in work-related activities. An IT department officer is monitoring the Internet data usage in a company. She collects the daily amount
Students in a communications class studied network television programming and found the average nonprogramming minutes in an hour of prime-time broadcasting for network television was 15:48
Alice is the jewelry designer for Diamond & Platinum and she is designing a new diamond collection. Before she starts her design, she is checking on the width of the diamond provided by the company.
The Government of Malaysia has ended the petrol and diesel subsidies that were introduced in December 1, 2014. The government sets pump prices based on the average cost of refined oil (MOPS fuel) of
A college registrar has been asked to prepare a report about the graduate students. Among other things, she wants to analyze the ages of the students. She has taken a sample of ten graduate students
Gold’s Gym selected a random sample of ten customers and monitored the number of times each customer used the workout facility in a one-month period. The following data were collected:10 19 17 19
A random sample of 20 pledges to a public radio fundraiser revealed the following dollar pledges:90 85 100 150 125 75 50 100 75 60 35 90 100 125 75 85 50 100 50 80a. Compute the range, variance,
Easy Connect, Inc., provides access to computers for business uses. The manager monitors computer use to make sure that the number of computers is sufficient to meet the needs of the customers. The
The following set of data are the ages of people who attended a five-day seminar:45 21 38 48 28 34 26 53 29 27a. Calculate the range and interquartile range for the data set. Assume the data set is a
Consider the following two separate samples:27 27 25 12 15 10 20 37 31 35 and 1 3 2 16 18 16 16 4 16 118a. Calculate the range, variance, standard deviation, and interquartile range for each data
The following data show the number of hours spent watching television for 12 randomly selected freshmen attending a liberal arts college in the Midwest:Hours of Television Viewed Weekly 7.5 11.5 14.4
The amount of sugar (in gram) contained in a milk-based drink selected from a production line is as follows:15.5 14.6 14.3 14.8 13.5 14.2 13.4 14.6 13.3 12.2 14.1 14.1 14.3 13.8 13.6 Determine the
The following data are the population of ages of students who have recently purchased a sports video game:16 15 17 15 15 15 14 9 16 15 13 10 8 18 20 17 17 17 18 23 7 15 20 10 14 14 12 12 24 21a.
The following data reflect the number of times a population of business executives flew on business during the previous month:4 6 9 4 5 7a. Compute the range for these data.b. Compute the variance
Google is noted for its generous employee benefits.The following data reflect the number of vacation days that a sample of employees at Google have left to take before the end of the year:3 0 2 0 1 3
In order to practice law in Nebraska, individuals are required to pass the Nebraska bar exam. The exam is challenging, and most attorneys who attempt to take the exam spend a substantial amount of
Suppose a random sample of 137 households in Detroit was taken as part of a study on annual household spending for food at home. The sample data are contained in the file Detroit Eats.a. For the
A proposal in a South Carolina county calls for all homeowners over the age of 65 with incomes at or below the 20th percentile to get a reduction in property taxes. A random sample of 50 people over
In an effort to track housing prices, the National Association of Realtors developed the Pending Home Sales Index (PHSI), a leading indicator for the housing market. An index of 100 is equal to the
Japolli Bakery tracks sales of its different bread products on a daily basis. The data for 22 consecutive days at one of its retail outlets in Nashville are in a file called Japolli Bakery. Calculate
Dynamic random-access memory (DRAM) chips are routed through fabrication machines in an order that is referred to as a recipe. The data file DRAM Chips contains a sample of processing times, measured
Each year, Bloomberg Businessweek publishes information and rankings of master of business administration (MBA) programs. The data file MBA Analysis contains similar data on several variables for
One of the conditions for measuring health is having a healthy body weight. An ideal body weight range is based on the height, gender, and age of a person. A recent study on health selected two
The following table exhibits base salary data obtained from a survey of over 170 benchmark positions, including finance positions. It reports the salaries of a sample of 25 human resource directors
To obtain the average retail cost of a 55 HD flatscreen TV in 2015, a survey yielded the following data(in U.S. dollars):606.70 558.12 625.82 533.70 464.37 511.15 400.56 538.20 531.64 632.14 474.86
Samara Hauser is planning to buy a new car and she hopes to save on her expenses in petrol. Thus, before her purchase, she studied the mileage (in km) a car can travel at full tank oil capacity (in
Toys “R” Us, Inc., is the leading store for children’s toys and other play material. The company’s financial officer is determining the previous month’s sales revenues. The following data
A librarian for Monfast University is checking the number of books borrowed by university students. He recorded the daily number of books borrowed by students during the past 30 days. The data are
The La Costa Corporation operates five manufacturing plants in South America. The company tracks the medical costs that are directly attributed to accidents that occur at the plants each year. The
Vistaprint is a digital printing company that prints items like business cards, calendars, and posters. It owns a certain number of printing machines. To ensure the machines operate properly, the
A food manufacturer recently found that there is a huge variation in the weight of chickens supplied by a local farm. To justify their suspicion, the manufacturer randomly selects 20 chickens and
A professor wishes to develop a numerical method for giving grades. He intends to base the grade on homework, two midterms, a project, and a final examination. He wishes the final exam to have the
Consider the following scores for a statistics test that has been selected from students who attend Bright University:65 82 73 91 95 86 78 69 80 88 55 46 58 67 66 73 81 48 59 70a. Determine the
Examine the following data:23 65 45 19 35 28 39 100 50 26 25 27 24 17 12 106 23 19 39 70 20 18 44 31a. Compute the quartiles.b. Calculate the 90th percentile.c. Develop a box and whisker plot.d.
A random sample of the miles driven by 20 rental car customers is shown as follows:90 85 100 150 125 75 50 100 75 60 35 90 100 125 75 85 50 100 50 80 Develop a box and whisker plot for the sample
The ages of 15 employees selected from a company are as follows:53 32 61 27 39 44 45 57 25 28 33 35 36 33 41 Calculate the mean, median, first quartile, and third quartiles for the sample
A European cereal maker recently sampled 20 of its medium-size oat cereal packages to determine the weights of the cereal in each package. These sample data, measured in ounces, are as follows:14.7
The following data reflect the number of defects produced on an assembly line at the Dearfield Electronics Company for a period of 8 days:3 0 2 0 1 3 5 2 5 1 3 0 0 1 3 3 4 3 1 8 4 2 4 0a. Compute the
A random sample of 15 articles in Fortune revealed the following word counts per article:5,176 6,005 5,052 5,310 4,188 4,132 5,736 5,381 4,983 4,423 5,002 4,573 4,209 5,611 4,568 Compute the mean,
The file titled Diesel$ contains the average nationwide diesel price on the last Friday of the month for the years 2013–2015.a. Construct a histogram with 11 classes.b. What are the possible
Elliel’s Department Store tracks its inventory on a monthly basis. Monthly data for 2008 through 2012 are in the file called Elliels.a. Construct a line chart showing the monthly inventory over the
The file Home-Prices contains information about single-family housing prices in 100 metropolitan areas in the United States.a. Construct a frequency distribution of median single-family home prices.
The data in the file titled Digital provide the brand of digital devices owned by a sample of consumers.Produce a pie chart that represents the market shares obtained from the referenced sample.
The file titled Diesel$ contains the average on-highway diesel prices for the last Friday of the month in the years 2013–2015. Develop a line chart that shows the trend in diesel prices, and write
DLT is an authorized dealer for selling desktops, laptops, tablets, and other computer accessories for certain computer technology companies. The following table shows the sales of DLT’s three
A computer software company has been looking at the amount of time customers spend on hold after their call is answered by the central switchboard. The company would like to have at most 2% of the
Catherine just graduated and received a Bachelor’s Degree. She wants to determine whether she needs to continue pursuing a Master’s Degree or start working.She did a study on the monthly income
Dave is doing a study on recycling. He visited the civic amenity site (CA site) and household waste recycling center (HWRC) where the public can dispose of household waste to collect his
A museum is planning to adjust the price of its entry tickets. The management recorded a group of visitors’ages for a specific day. The sample collected by the museum is as follows:34 24 14 23 56
Barbara is going to Tokyo for a business trip that will last for a period of 10 days. To make sure she brings enough clothes for the trip, she checks the weather report to estimate the general
As it has become more popular to stream movies over the Internet at home from such sources as Hulu and Netflix, ticket sales at movie theaters have been affected.The following data reflect annual
State the differences between a line chart and a scatter plot.
What are the characteristics of a data set that would lead you to construct a pie chart?
What are the characteristics of a data set that would lead you to construct a bar chart?
Discuss the advantages of constructing a relative frequency distribution as opposed to a frequency distribution.
The sub-prime mortgage crisis that hit the world economy also affected the real estate market. Both new and existing home sales were affected. A file titled EHSales contains the number of existing
Federal flood insurance underwritten by the federal government was initiated in 1968. This federal flood insurance coverage has, according to USA Today(“How you pay for people to build in flood
The data in the file called Gasoline Prices reflect the average price of regular unleaded gasoline in the state of California for 36 consecutive years. The first price column is the actual average
Japolli Bakery tracks sales of its different bread products on a daily basis. The data are located in a data file called Japolli Bakery. Develop a line chart that displays these data. Discuss what,
As an analyst for one of the major airlines, you have been asked to analyze the relationship between passenger capacity and fuel consumption per hour.Data for 17 commonly flown planes are presented
Wilson Green started a lawn service business in 1997 with 15 customers. By 2015 his customer list had grown to 6,530 customers across three cities. The file WilsonGreen contains data showing the
Having a Major League Baseball team in a city is generally considered to provide an economic boost to the community. The data file MLB Attendance-2015 contains data for both home and road game
On July 31, 2015, usatoday.com reported on big oil profits. The file BIGOIL contains the quarterly combined net incomes of the oil companies that are part of the S&P 500 Index for 2006 through the
At a local clinic, a doctor has been receiving complaints from the nurse that the clinic needs more staff members due to the increasing number of patients.Before the doctor makes a decision, he
The following data show worldwide computer/video game sales:Year Sales (billions)2000 $48.2 2001 $45.4 2002 $48.3 2003 $41.9 2004 $54.6 2005 $44.3 2006 $48.4 2007 $62.9 2008 $77.2 2009 $64.5 2010
A mechanic is determining the weight of a car affecting gas mileage. He measures and records 10 various cars’ weight (in pounds) and their miles per gallon (MPG) in the following table:Weight MPG
Azuria Inc. recorded its every half an hour stock prices during a day from 9:30 a.m. to 4:00 p.m., represented in the following data:Time 9:30 a.m. 10 a.m. 10:30 a.m. 11 a.m. 11:30 a.m. 12 noon 12:30
The year-end net income (in millions) for a company for the years 2004–2015 are shown below:Year 2004 2005 2006 2007 2008 2009 Net Income 25.9 31.5 31.7 31.7 34.5 36.8 Year 2010 2011 2012 2013 2014
The following data have been selected for two variables, y and x. Construct a scatter diagram for these two variables and indicate what type of relationship, if any, appears to be present.y x 100
You have the following sales data for the past 12 months. Develop a line graph for these data.Month Jan Feb Mar Apr May Jun Sales 200 230 210 300 320 290 Month Jul Aug Sep Oct Nov Dec Sales 300 360
The following data represent 11 observations of two quantitative variables:x = contact hours with client, y = profit generated from client.x y x y x y x y 45 2,345 54 3,811 34 -700 24 1,975 56 4,200
In your capacity as assistant to the administrator at Freedom Hospital, you have been asked to develop a graphical presentation that focuses on the insurance carried by the geriatric patients at the
Amazon.com has become one of the success stories of the Internet age. Its growth can be seen by examining its increasing sales volume (in $billions) and the net income/loss during Amazon’s
A health insurance company selected a random sample of hospitals from each of four categories of hospitals: university related, religious related, community owned, and privately owned. At issue is
The manager for a credit union has selected a random sample of 300 of the credit union’s credit card customers. The data are in a file called Capital. The manager is interested in graphically
Suppose that cars with high consumer satisfaction ratings have a tendency to stay on dealers’ lots a shorter period of time. As an example, suppose the Honda Ridgeline had stayed on dealers’ lots
A survey conducted at a state university that asked students what brand of digital music device they owned yielded the following data:Corporation Apple Samsung LG Nokia HTC Percentage 74% 6.4% 3.9%
The following data represent the seat capacity for major airlines on an annual basis:Airline Seat Capacity (in Billions)Airline Capacity United Delta Northwest U.S. Airways ATA 145 130 92 54 21a.

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