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# Descriptive Statistics

### Poisson Distribution and Interpretation of the Mean

The local police department must write on average 5 tickets a day to keep department revenue at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with a mean of 6.5 tickets per day. Which of the following statements is the best interpretation of the value of the mean? A. The number

### Describing the Shape of a Distribution

The following is a five-number summary calculated from observations of the percentage of calories that come from fat in 23 items advertised as "reduced" fat from a sample of fast food chain restaurants. Form the box-and-whisker plot, select the phrase below which best describes the shape of the distribution. 15 20 22 26

Given that f(x)=x/2, where 0 < x < 2, please prove that the moment generating function is M(z)=[(2z-1)exp(2z)+1]/2z^2, and please use it to prove that the kth moment about the origin is 2^(k+1)/(k+2) by expanding exponentials.

### Salaries of baseball players

I would like your HELP in answering these questions. The questions are related to the same subject SALARIES OF BASEBALL PLAYERS; 1. Are you looking at average teams, payrolls or individual player's salaries? I would answer TEAMS SALARIES 2. And if the latter, then what is the logic for any variation? 3. Is there a caus

### Descriptive Statistics in Customs & Immigration

I need help answering questions on descriptive statistics: 1. Please give three examples of how descriptive statistics are used in Customs & Immigration. 2. Are these statistics misleading in any way? 3. Could they be? 4. Are there any improvements of which you can think? Can you give me the sources.

### Choosing the sample size

A bank wants to estimate the mean dollars that each card holder will spend each month. It would like to be within plus or minus \$10 of the true mean with a 98% confidence level. The standard deviation is thought to be \$500. How many card holders should be sampled, and if we decided it will cost us \$5 per sample only planning to

### Descriptive Statistics : Mean, Median, Mode and Standard Deviation

Please see the attached file for the fully formatted problems. Unit 9: Critical Thinking Exercise Data Collection and Data Analysis The Tastee-Yummy Dog Bone Company has developed four new commercials for their line of flavored dog cookies. Before selecting one of the commercials for production, they conducted research to a

### v

Suppose that a sample of 150 new home owners indicated the following information as to whether they possessed a Visa Card or an American Express Card. American Express Card YES NO TOTAL 60 40

### Determining Coefficients of Correlation and Determination

The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year. Car Age (years) Selling Price (\$000) Car Age (years) Selling Price (\$000) 1 9 8

### Production Department of NDB Electronics

The production department of NDB Electronics wants to explore the relationship between the number of employees who assemble a sub-assembly and the number produced. As an experiment, two employees were assigned to assemble the sub-assemblies. They produced 15 during a one-hour period. Then four employees assembled them. They

### Descriptive statistics and z-scores

1.Senator Hayes is considering a a run for the U.S. presidency, but she is only 35 years of age, which is the minimum required age. While investigating this issue, she finds the ages of past presidents when they were inaugurated, and those ages are listed below. Using the ages listed find the (a) mean; (b) median; (c) mode; (d)

### Scatter Diagram for "Best Small Companies" Sales and Earnings

A recent article in Business Week listed the "Best Small Companies." We are interested in the current results of the companies' sales and earnings. A random sample of 12 companies was selected and the sales and earnings, in millions of dollars, are reported below. Sales Earnings

### Percentage of Air Conditioned Rooms

One night a certain motel rented 3/4 of its rooms, including 2/3 of its air-conditioned rooms. If 3/5 of its rooms were air-conditioned, what percent of the rooms that were not rented were air-conditioned?

### Are Confidence intervals part of descriptive statistics or inferential statistics- why?

Are Confidence intervals part of descriptive statistics or inferential statistics- why? Why would we use confidence intervals instead of point estimates? Give an example of the use of a confidence interval and why you would prefer it over point estimates in your example.

### Statistics - Descriptive Data

Kimble Products: Is There a Difference In the Commissions? At the January national sales meeting, the CEO of Kimble Products was questioned extensively regarding the company policy for paying commissions to its sales representatives.The company sells sporting goods to two major markets. There are 40 sales representatives who

### Statistics Problem: level of measurement. What is the level of measurement for these items related to the newspaper business?

What is the level of measurement for these items related to the newspaper business? a. The number of papers sold each Sunday during 2004. b. The departments, such as editorial, advertising, sports, etc. c. A summary of the number of papers sold by county. d. The number of years with the paper for each employee.

### Mean, standard deviation, standard error of the mean & confidence interval

I took a random sample of eight cities and their low temperatures for today. Now I need to find the sample mean, sample standard deviation, and standard error of the mean and calculate a 95% confidence interval. The temperatures were: 35,39,49,36,49.53,41,46

### Sexually Transmitted Diseases and Statistical Analysis

General K. is concerned about sexually transmitted disease (STD) among the troops. In random inspection of 100 soldiers, 31 were found to have a venereal disease. To reduce the incidence, soldiers were shown an educational film on preventing STDs. In a second inspection of 200 soldiers, 43 had STDs. Calculate the following s

### Length of time to complete 1040 tax form

According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time to prepare, copy, and electronically file form 1040 is 80 minutes. a) What assum

### Independent variable/dependent variable

What is the independent variable and the dependent variable?

### Sample size

You are to conduct a sample survey to determine the mean family income in a rural area of central Florida. The question is, how many families should be sampled? In a pilot sample of 10 families, the standard deviation of the sample was \$500. The sponsor of the survey wants you to use the 95 percent confidence level. The estimate

### Calculating A-C as described

A study is made by the recording industry in the US of the number of music CDs owned by senior citizens and young adults. The information is reported below Seniors 28 35 41 48 52 81 97 98 98 99 118 132 133 140 145 147 153 158 162 174 177 180 180 187

### Stats for social sciences

Data collected by the highway patrol indicate that the average speed on the stretch of an interstate is 63mph with a standard deviation of 15. What is the likelihood of observing a vehicle traveling 80 mph or more?

### Uncertainty in the Resistance

The resistance of a resistor is measured 10 times, and the values determined are 100.0, 100.9, 99.3, 99.9, 100.1, 100.2, 99.9, 100.1, 100.0, and 100.5. Calculate the uncertainty in the resistance. Please show all steps to help my understanding. Thanks.

### Descriptive Statistics Case Studies

What are the standard deviations of the returns for stocks A and B? Suppose you want to use this history as a guide to making an investment decision for the long run. Based on this history, and assuming that standard deviation of return is the appropriate measure of risk, does it make any differ

### How could you use descriptive statistics at work?

1. How could you use descriptive statistics at work? 2. How could you use descriptive statistics in your personal life? 3. The median home price in your area has increased in the last 10 years, how does this differ from the mean home price in your area? 4.When might coefficient of variation be a better measure of dis

### Can we conclude that more than 40 call are made on the average in a week by the Rocky Mountain district sales manager?

The Rocky Mountain district sales manager of JCM, Inc., a college book publishing company, claims that each of his sales representatives makes 40 calls on professors per week. Several reps said that this estimate is too low. To research the claim, a random sample of 28 reps revealed that the mean number of calls made last week

### Weighted percentages

A business operates with 9 locations. Each year, each location is allotted an overtime budget based on the previous years' activity. The total overtime budget for all 9 locations is \$10 million. Each activity is also weighted more in the overtime budget. ( ex: production numbers a weighted more than sales because production mos

### Public Debt in Germany

It is not clear what data is being measured here and I do not understand the missing variable information. I need to prepare a brief summary outline with any important trends. I am not clear on this case study, I am very confused. When Germany was reunited after the Berlin wall fell, two dramatically different social, econo

### Minimizing cost using Excel Solver

Each day, workers at the Gotham City Police Department work two 6-hour shifts chosen from midnight to 6AM, 6AM to noon, noon to 6PM and 6PM to midnight. The following numbers of workers are needed during each shift: 1. 15 from midnight to 6AM 2. 5 from 6AM to noon 3. 12 from noon to 6PM 4. 6 from 6PM to midnight W