A) After sampling 1000 members of a normal population, you find xbar = 15,500 and s = 9,950. Estimate the population mean with 90% confidence. b) Repeat part a assuming that you know that the population standard deviation is σ = 9,950 c) Explain why the interval estimates were virtually identical.
The UN must evacuate an aid team and their belongings from Iraq. They can hire two types of planes to handle the evacuation. One is an Airbus 201 which can handle 25 passengers and 10 tons of cargo for $800 per day. The other is a Boeing 179 which can handle 40 passengers and 4 tons of cargo at a cost of $1000 per day. The ev
A) A statistics practitioner took a random sample of 50 observations from a population whose standard deviation is 25 and computed the sample mean to be 100. Estimate the population mean with 90% confidence. b) Repeat part a using a 95% confidence level c) Repeat part a using a 99% confidence level d) Describe the effec
Administrators at a university are planning to offer a summer seminar. It costs $3000 to reserve a room, hire an instructor, and bring in the equipment. Assume it costs $25 per student for the administrators to provide the course materials. If we know that 20 people will attend, what price should be charged per person to break e
Please see the attached file. You already have the trendline and you need to predict the sales for 2006. Show your work in an Excel spreadsheet.Please show all work in the excel spreadsheet attached.Also please show the trendline.
Suppose the population mean is 50.6 pounds with a population standard deviation of 1.62 pounds. Suppose we take thousands of samples with a sample size of 5. What will the mean of these sample means be? What will the standard deviation of the sample means be?
What do we mean when we mention ordinal level scales vs. interval level scales? Can we contrast the two differences?
What is your age today? Explain why the descriptive stats could be important to your college, how might the college use the info to determine their market. ... [Please see the attached question file].
During the "Spring Fling", the bumper car amusement attraction has a problem of cars becoming disabled and in need of repair. Repair personnel can be hired at the rate of $20 per hour, but they only work as one team. Thus, if one person is hired, s/he works alone whereas two or three people would work together on the same broken
The problem is about Roche brothers expanding their super market - and the incremental cash flows associated with it. See the attached file.
A store (open 24 hours a day, every day) sells 8-roll packs of paper towels, at the rate of approximately 420 packs per week. Because the towels are so bulky, the annual cost to carry them in inventory is estimated at $.50 per 8-roll pack. The cost to place an order is $20. It takes four days for an order to arrive. Currently, S
A company distributes a printed guide for the approximate 22,000 visitors it has each year. Holding costs for the brochures are 10% of purchase cost - and it costs $30 to place an order with the printer (unless you order the largest discount category in which case the order cost drops to $25). . The printer has a discounted p
The Executive Camera Company provides full expenses for its sales force. When attempting to budget automobile expenses for its employees, the financial department uses mileage figures to estimate gas, tire, and repair expenses. Distances driven average 5,650 miles a month, and have a standard deviation of 120. The financial depa
Women in the U.S. Air Force have hands that are 6.9 inches on the average (from the tip of the middle finger to the heel of the hand). The standard deviation is 0.34 inches. Assume that hand length is normally distributed. (10 points) a. What proportion has hands longer than 7 inches? b. What proportion would have hands sh
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were: 3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477 (a) Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to esti
A large sporting goods store is placing an order for bicycles with its supplier. Four models can be ordered: the adult Open Trail, the adult Cityscape, the girl's Sea Sprite, and the boy's Trail Blazer. It is assumed that every bike ordered will be sold, and their profits, respectively, are 30, 25, 22, and 20. The LP model shoul
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Using
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. a. What is the value of the population mean? What is the best estimate of this value? b. Explain why we need to use the
The internal revenue service is auditing the operators of some 13,000 private airports by taking a random sample of 100 of them. The IRS discovers an average error in reported taxable income of $14,750, and the population standard deviation is known to be $3,600. Determine a 90 percent confidence interval for the average error m
A team of introductory statistics students (with too much free time) when to Marsh and recorded the calories and fat for various kinds of soup. Write a succinct summary of the central tendency, dispersion, and shape of the data. [See the attached Data File.]
Listed on the MEGASTAT attachment is the average daily circulation for the 50 U. S. newspapers with the largest circulation. Please show all work/outputs. a. Find the mean, median, Q1, and Q3. b. Find the 15th and the 90th percentiles. c. Find the coefficient of skewness and interpret the result. d. Develop a box plot a
The cost of one serving of peanut butter (in cents) for a random sample of 19 jars of peanut butter was found to be: 22 27 32 26 26 19 16 26 14 21 20 21 20 17 12 32 17 9 16 a) Give the five-number summary (low, Q1, median, Q3, high) b) Calculate the IQR.
Please see the attachment. 12. Table 1. Results of a screening test for diabetes, using a cutoff point of 160 mg.dl. True Diagnosis Test result Diabetic Not Diabetic Total Positive 34 20 54 Negative 116 9,830 9,946 Total 150 9,850 10,000 The specificity of the screening test for diabetes is a. 0.3% b.
Considering all of the day to day activities you are engaged in at work and in your personal lives, write a 200 (or more) word paper that describes at least three (3) different statistical usages that you see regularly. For each, describe how the statistics enhance the understanding of an issue or problem for the reader. Finally
Using the approximation For small x, find a simple algebraic relationship between FKA(t) and FNA(t) Comment briefly on the relationship you have found. ^ ^ ^ F KA (t) = 1 - ∏ (1 - λj) where λj = ^
2. What is the level of measurement for these items related to the newspaper business? (page 14) 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
Use the following problem to determine the binding constraints for the optimal solution. MAX P = 30X + 40Y 4X + 2Y < 16 A 2X - Y > 2 B Y < 1 C X , Y > 0 Constraint A Constraints
Cal and Becky have known each other since high school. Two years ago, they entered the same university, and today they are taking undergraduate courses in the business school. Both hope to graduate with degrees in finance. In an attempt to make extra money and to use some of the knowledge gained from their business courses, C
2. A math test was given with the following results: 80, 69, 92, 75, 88, 37, 98, 92, 90, 81, 32, 50, 59, 66, 67, 66 Find the range, standard deviation, and variance for the scores. 3. For a particular sample of 50 scores on a psychology exam, the following results were obtained. Mean = 78 Midrange = 72 Third quartile = 94
The average diameter of sand dollars on a certain island is 3.00 centimeters with a standard deviation of 0.70 centimeters. If 9 sand dollars are chosen at random for a collection, find the probability that the average diameter of those sand dollars is more than 2.790 centimeters. Assume that the variable is normally distribute