The following data give the gains in weight of eight pairs of experimental animals matched with respect to growth factors. One of each pair, selected by chance, was given a supplement of vitamin B to its regular diet. Use the matched pairs technique to test whether B had no influence on weight. The following data give the gai
The operations manager at a light bulb factory wants to determine whether there is a difference in the average life expectancy of bulbs manufactured on two different types of machines. The process standard deviation of Machine I is 110 hours and of Machine II is 125 hours. A random sample of 25 lights bulbs obtained from Machi
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.
(See attached file for full problem description) Please provide step-by-step solution to figure out these types of problems.
For a sample size 16, the sampling distribution of the mean will be approximately normally distributed: A. regardless of the shape of the population B. if the shape of the population is symmetrical C. if the sample standard deviation is known D. if the sample is normally distributed
For air travelers, one of the biggest complaints is of the waiting time between when the airplane taxis away from the terminal until the flight takes off. This waiting time is known to have a skewed-right distribution with a mean of 10 minutes and a standard deviation of 8 minutes. Suppose 100 flights have been randomly sampled
The following ordered array (from left to right) depicts the amount of money (in dollars) withdrawn from a cash machine by 25 customers at a local bank: 40 50 50 70 70 80 80 90 100 100 100 100 100 100 110 110 120 120 130 140 140 150 160 160 200 Compute descriptive summary meas
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
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.
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
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.
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
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
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
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
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
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)
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
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? 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.
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
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.
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
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
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
What is the independent variable and the dependent variable?
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
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
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?