smaple

Consider the following chart.

(a) Dot plot. (b) There are 15 observations in the study. (c) Maximum = 7 Minimum = 1 (d) The values cluster on 2 or 3.

Silver Springs Moving and Storage Incorporated is studying the relationship between the number of rooms in a move and the number of labor hours required for the move. Compute a correlation coefficient.

.83

A bottling company offers three kinds of delivery service: instant, same day, and within five days. The profit per delivery varies according to the kind of delivery. The profit for an instant delivery is less than the other kinds because the driver has to go directly to a grocery store with a small load and return to the bottling plant. To find out what effect each type of delivery has on the profit picture, the company summarized the data in the following table based on deliveries for the previous quarter: Type of DeliveryFrequency per QuarterProfit per DeliveryInstant100160Same day3070Within five days7070

115

The Thomas Supply Company Incorporated is a distributor of gas-powered generators. As with any business, the length of time customers take to pay their invoices is important. Listed below, arranged from smallest to largest, is the time, in days, for a sample of the Thomas Supply Company Incorporated invoices. 131313202626273134343535363738414141424344474849515556626782

1Q= 30 3Q= 48.25 2D= 26.20 8D= 50.60 67th P= 43.77

Assume a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 4 credit-hour courses, Statistics is a 4 credit-hour course, and Spanish is a 4 credit-hour course. If 4 grade points are assigned for an A, 3 for a B, and 2 for a C, what is the weighted mean grade for the semester?

2.75

In June, an investor purchased 200 shares of Oracle (an information technology company) stock at $18 per share. In August, she purchased an additional 250 shares at $28 per share. In November, she purchased an additional 450 shares at $28. What is the weighted mean price per share? (Round your answer to 2 decimal places.)

25.78

The unemployment rate in the state of Alaska by month is given in the table below: JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember8.19.59.06.08.38.87.58.97.38.17.27.0

Arithmetic mean: 7.98 Median Mode. 8.10, 8.10 Mean Median. 8.4, 8.55 higher unemployment

The personnel files of all eight employees at the Pawnee location of Acme Carpet Cleaners Incorporated revealed that during the last 6-month period they lost the following number of days due to illness: 66412141 All eight employees during the same period at the Chickpee location of Acme Carpets revealed they lost the following number of days due to illness: 92021215

Pawnee location R/M- 5, 3.13 Chickpea location R/M- 9, 2.75 Chickpea PAWNEE

Explain the difference between qualitative and quantitative variables.

Qualitative data is not numerical, whereas quantitative data is numerical.

When pharmaceutical companies try a new vaccine on a portion or part of a population, this is called a:

Sample

A chain of sport shops catering to beginning skiers, headquartered in Aspen, Colorado, plans to conduct a study of how much a beginning skier spends on his or her initial purchase of equipment and supplies. Based on these figures, it wants to explore the possibility of offering combinations, such as a pair of boots and a pair of skis, to induce customers to buy more. A sample of 44 cash register receipts revealed these initial purchases:

Smallest Class Interval: 28.8 Better Class Interval: 30 Organize class limit: 70up to 100 4 100up to 130 12 130up to 160 12 160up to 190 8 190up to 220 8

Which of the following is an example of a qualitative variable?

The industry category that a company is in

Speedy Swift is a package delivery service that serves the greater Atlanta, Georgia, metropolitan area. To maintain customer loyalty, one of Speedy Swift's performance objectives is on-time delivery. To monitor its performance, each delivery is measured on the following scale: early (package delivered before the promised time), on-time (package delivered within 15 minutes of the promised time), late (package delivered more than 15 minutes past the promised time), or lost (package never delivered). Speedy Swift's objective is to deliver 99% of all packages either early or on-time. Another objective is to never lose a package.

What kind of variable is delivery performance? Qualitative What scale is used to measure delivery performance? Ordinal Construct a frequency table for delivery performance for the last month. 19, 72, 8, 1 Construct a relative frequency table for the delivery performance last month. .19, .72, .08, .01

Wendy's offers eight different condiments (mustard, ketchup, onion, mayonnaise, pickle, lettuce, tomato, and relish) on hamburgers. A store manager collected the following information on the number of condiments ordered and the age group of the customer. What can you conclude regarding the information? Who tends to order the most number of condiments?

Younger people order more

The Director of Planning for Devine Dining Incorporated wishes to study the relationship between the time of day a customer dines and whether the guest orders dessert. To investigate the relationship, the manager collected the following information on 200 recent customers. Dessert OrderedTime of DayTotalLunchDinnerYes3285117No681583Total100100200

a) Both variables are normal. b) The given table is called contingency table. c) Yes, 58.5% or more than half of the customers order dessert. d) No, only 32% of lunch customers are likely to order dessert. e) Yes, 85% of customers at dinner time are more likely to order dessert.

The following cumulative frequency polygon shows the hourly wages of a sample of certified welders in the Atlanta, Georgia, area.

a. How many welders were studied? 40 b. What is the class interval? 5 c. About how many welders earn less than $11 per hour? 13 d. About 75% of the welders make less than what amount? 20 e. 20% of the welders studied made less than what amount? 15 f. What percent of the welders make less than $10 per hour? 30%

The annual report of Dennis Industries cited these primary earnings per common share for the past 5 years: $2.22, $1.25, $2.21, $4.19, and $2.44. If we assume these are population values.

arith mean: 2.46 Variance: .92

An example of a qualitative variable is

color of ink in a pen.

Identify whether the table given below is a frequency table or a frequency distribution.

Frequency distribution

Describe the differences between a histogram and a dot plot. When might a dot plot be better than a histogram?

Histogram is better for large data sets and dot plot is better for small data sets.

The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting Incorporated during the most recent quarter. Frequent Flier Miles (000) Number of Employees 0 up to 3- 6 3 up to 6- 11 6 up to 9- 25 9 up to 12- 9 12 up to 15- 1 Total 52

How many employees were studied?: 52 What is the midpoint of the first class? 1.5 A frequency polygon is to be drawn. What are the coordinates of the plot for the fourth class? x=10.5, y=9

Listed below are the commissions earned ($000) last year by a sample of 15 sales representatives at Furniture Patch Incorporated $ 4.4$ 6.2$ 7.5$ 10.8$ 12.0$ 13.6$ 14.7$ 15.4$ 16.9$ 17.4$ 18.8$ 22.3$ 36.2$ 43.2$ 79.7

Mean $21.27 Median $15.40 Standard deviation $19.26 .914 2.301

A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year: 769729749752680692713690743759745719748746721683716685757744710689769738762

Mean$728.32 Median$738 Mode$769 Range: 89 SDev: 29 670.30 to 786.34

Exits along interstate highways were formerly numbered successively from the western or southern border of a state. However, the Department of Transportation changed most of them to agree with the numbers on the mile markers along the highway. a. What level of measurement were data on the consecutive exit numbers? b. What level of measurement are data on the milepost numbers? c. The newer system provided information on the distance between exits.

a. ordinal b. ratio c. true

A sample of assistant professors on the business faculty at state-supported institutions in Ohio revealed the mean income to be $72,000 for nine months, with a standard deviation of $3,000. Using Chebyshev's theorem, what proportion of the faculty earns more than $66,000, but less than $78,000?

at least 75%

An auto insurance company reported the following information regarding for the age of a driver and the number of accidents reported for that driver last year.

decreased

When statisticians analyze sample data in order to draw conclusions about the characteristics of a population, this is referred to as

statistical inference.

The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called

statistics

The main purpose of descriptive statistics is to

summarize data in a useful and informative manner.

The Grand City Water and Sewer Company selected a random sample of 20 residential customers. Following are the amounts, to the nearest dollar, the customers were charged for water and sewer last month:

54.45 Statistic

A poll solicits a large number of college undergraduates for information on the following variables: the name of their cell phone provider (AT&T, Verizon, and so on), the numbers of minutes used last month (200, 400, for example), and their satisfaction with the service (Terrible, Adequate, Excellent, and so forth). What is the level of measurement for each of these three variables?

The cell phone provider: Nominal The number of minutes used: Ratio Satisfaction with the service: Ordinal

For the following situations, would you collect information using a sample or a population?

To compare the salary of software and hardware technicians in Washington. Sample b. To find the number of countries in the world with nuclear weapons. Population c. To find the percentage of users of a soap that a company manufactures. Sample d. To find how many students in a particular class of a college in New York own PCs. Population

The distribution of the weights of a sample of 1,300 cargo containers is symmetric and bell-shaped.

95, 47.5 2.5

2,000 frequent business travelers were asked which midwestern city they prefer: Indianapolis, Saint Louis, Chicago, or Milwaukee. 105 liked Indianapolis best, 405 liked Saint Louis, 1,290 liked Chicago, and the remainder preferred Milwaukee. Develop a frequency table and a relative frequency table to summarize this information.

City Frequency Relative Frequency Indianapolis- 105 0.053 Saint Louis- 405 0.203 Chicago- 1,290 0.645 Milwaukee- 200 0.100

The number of families who used the Minneapolis YWCA day care service was recorded over a 30-day period. The results are as follows: 6053674067514433495938546034523532534205618855555524553750

Class Cumulative Frequency 0up to15 2 15up to30 7 30up to45 14 45up to60 26 60up to75 30

Molly's Candle Shop has several retail stores in the coastal areas of North and South Carolina. Many of Molly's customers ask her to ship their purchases. The following chart shows the number of packages shipped per day for the last 100 days. For example, the first class shows that there were 5 days when the number of packages shipped was 0 up to 5.

Histogram 100 5 10 .10 7.5 95

The following is the number of minutes to commute from home to work for a group of 25 automobile executives. 34493436445444504643344331453934474425385453473740

How many classes would you recommend? 5 What class interval would you suggest? 6 Organize the data and plot a frequency distribution on a piece of paper. It IS FAIRLY SYMETRIC

The American Society of PeriAnesthesia Nurses (ASPAN; www.aspan.org) is a national organization serving nurses practicing in ambulatory surgery, preanesthesia, and postanesthesia care. The organization consists of the 40 components listed below.

Mean 340.43 Median 265.00 Standard deviation 278.32 CSkew= 1.36 Mild First quartile 129.50 Third quartile 483.50 -402, 1015 Two

The box plot shows the undergraduate in-state tuition per credit hour at four-year public colleges.

Median- 450 Q1- 300 Q3- 750 IR- 450 Less than 0, more than 1425 Outlier is 1500 Positively Skewed

A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, or inferior. The descriptive summary showed the following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0% inferior.

Most students rated the instructor as poor or average.

Which one of the following is not an example of discrete data?

Number of miles between New York City and Chicago

Explain the difference between a discrete and a continuous variable.

Discrete variables can assume only certain values, but continuous variables can assume any values within some range.

The length of a bridge, measured in meters, is an example of

quantitative data.