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Quantative Analysis of Data

Simple random sample of weights of women

7-9. Use the simple random sample of weights of women from a data set, we obtain these sample statistics: N= 35 X = 141.38 lbs Research from other sources suggest that the population of weights of women has a standard deviation given by o = 31.95 lb. a. Find the best point estimate of the mean weight of all women. (The

Statistics: Test freshmen and juniors for stressful events

Reasearchers were interested in examining the number of stressful events experienced by college students. They collected data from 2 groups of students: freshmen and juniors. The instrument they used to collect the data was a simple checklist that asked the student to check every item that that has occurred to you in the last th

Calculating the Average Availability of a System

Question: A system has a constant failure rate lambda = 0.0002 failures/hour. When an item fails, it is repaired to be as good as new condition. The associated mean downtime is 6 hours. The system is supposed to be in continuous operation. a) Find the Aav average availability of the system. b) How many hours per year will

Statistical Analysis: Graphical Representation of Data and Report

Federal Aviation Administration In January 2003, the FAA ordered that passengers be weighed before boarding 10-19 seat passenger airplanes. The order was instituted in response to a crash that occurred on January 8, 2003 in Charlotte, North Carolina, in which all 21 passengers, including the pilot and co-pilot, of a 19-seat

Statistics 8 questions

1. What is the relationship between the value for degrees of freedom and the shape of the t distribution? What happens to the critical value of t for a particular alpha level when df increases in value 2. The following sample was obtained from a population with unknown parameters Scores: 8, 0, 8, 8 a. Compute the sample me

Statistics

PROBLEM 1 NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded. A random sample of 35 stations in the Milwaukee, WI, area revealed that the mean price was $1.52 per gallon and that the standard deviation was $0.05 per gallon

Prof. Hardtack gave four Friday quizzes: Statistically assess the scores

Individual Assignment: Exercises From the E-Text ? Resource: Applied Statistics in Business and Economics ? Prepare answers to the following exercises from Applied Statistics in Business and Economics: ? Chapter 4: Exercises 4.4 Page 125; with modifications. The following problem is similar to exercise 4

Six Sigma Analysis: Tolerance Limits and Cpk

Suppose one of the key dimensions of U-bolts manufactured for a particular customer is 10.75 +/- 0.25. To qualify the process, you built 120 u-bolts and obtained the following data. Statistic U-Bolt Measurement Mean 10.717 Standard Error 0.00793 Median 10.7 Mode 10.65 Standard Deviation 0.0868 Sample Variance 0.007

Mean, median, mode, range and standard deviation of sample data

1. Calculate the (A) mean, (b) median (c) mode and (d) Range and (e) Standard Deviation for the data below. You may use full functions of Excel. Hint. Copy and paste the data into an Excel spread sheet. Copy, then click one cell in Excel, and paste. Excel will fill the proper cells below the one you selected. Mean______;

Random & Discrete Variable/ Continuous Probability Distributions

See attached files. See attached Practice Business Statistics for Management and Economics ch 7 & 8. The answers are highlighted in yellow. I have difficulty setting up the steps in Excel to come up with the correct answers. I need to see how the answers are derived in Excel. I have found the data required for problems

Measures of Central Tendency and Variation and their Interpretation

A quality characteristic of interest for a tea-bag-filling process is the weight of the tea in the individual bags. If the bags are under filled, two problems arise. First, customers may not be able to brew the tea to be as strong as they wish. Second, the company may be in violation of the truth-in-labeling laws. In this ex

Collect data and analyze mean, mode, median, standard deviation

Your specific assignment for this week is to select a type of quantitative data to collect from your own life. Please divide the day into two parts: AM and PM and get the data on one of these items for each part. Describe the data you are going to collect. Collect data starting today so you can have at least 20 observations

Measures of Central Tendency and Standard Deviation

A. Calculate all measures of central tendency for data that are interval or ratio in measurement b. Calculate the standard deviation for data that are interval or ratio in measurement c. Assume this is a sample of students, calculate a t-test that compares boys and girls on the number of absences (you can assume equal vari

Statistical calculations to determine if to fire salesperson

A salesperson in a small appliance store sells the following number of air conditioners each month (starting in January) throughout the year. 3, 5, 5, 6, 12, 17, 14, 9, 4, 2, 1, 1. The store owner did a few calculations using one of his statistics books and concluded the salesperson should be fired. Using the knowledge you have

Normal Distribution, Mean, Median, Mode, Middle

1. Describe the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution? 2. Does all statistical data have a mean, median, or mode? Why? When is the mean the best measure of central tendency? When is the median the b

Unemployment Study

Case Problem #2 Unemployment Study See this link for the general problem. Make sure to use the attached data set, not the one in the book. http://books.google.com/books?id=_sOSAXTuy8cC&lpg=PA386&ots=24jaKDjmjL&dq=case%20problem%202%20Unemployment%20Study&pg=PA386#v=onepage&q=case%20problem%202%20Unemployment%20Study&f=fal

Descriptive statistics & Confidence Interval: Oil spill

Please see attached file for data. Owing to several major ocean oil spills by tank vessels, Congress passed the 1999 Oil Pollution Act, which requires all tankers to be designed with thicker hulls. Further improvements in the structural design of a tank vessel have been proposed since then, each of which the objective of redu

Statistics

1. Find the mean of the distribution shown. x 1 2 P(x) 0.31 0.69 A) 0.96 B) 1.42 C) 1.18 D) 1.69 2. For a normal distribution with mean 5 and standard deviation 6, the value 11 has a z value of A) -1 B) 1 C) 2 D) 3 3. If the standard deviation of a probability dis

Stephanie's Baskets quantitative analysis: Order quantity

Stephanie's Baskets sells wicker baskets at home parties. Stephanie sells 120 baskets/year, carries an ordering cost of $20/order, and an annual holding cost of 25. She currently orders 25 baskets at a time without using discounts. She has the opportunity to purchase at a discount. Given the following pricing sheet, what qua

Quantitative analysis of inventory: Optimal production lot size

Powell Industries produces its best-selling wPhone on a production line that has an annual capacity of 160,000 units. Williams Industries estimates the annual demand for this product to be at 60,000 units. The cost to set up the production line is $2345 and the annual holding cost is $20/unit. Current practice calls for pro

Statistics: Find Mean and Standard Deviation of Sample Data

For the data in the following sample: 8, 1, 5, 1, 5 A. Find the mean and the standard deviation B. Now change the score of x = 8 to X = 18, and find the new mean and standard deviation. C. Describe how one extreme score influences the mean and standard deviation.

Leadership Styles: Mean, Standard deviation, variance, mode

See attached file. The CEO of your company has asked you, the human resource manager, to conduct a study to determine whether or not male managers and female managers perceive leadership styles differently and, if differences are found, to develop a training program that will benefit gender differences in leadership. To this