One question on a student survey asks: In a typical week, how many times do you eat at a fast food restaurant? The following frequency distribution table summarizes the results for a sample n = 20 students. Number of times per week f __________________________________ 5 or more
1.A random sample of 35 days taken at a large hospital shows that an average of 44 patients was treated in the emergency room per day. The standard deviation of the population is 6. Find the 99% confidence interval of the mean number of ER patients treated each day at the hospital. What is the interval lower limit? What is t
A psychologist interested in political behavior measured the square footage of the desks in the official office of four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations. The figures for the governors were 44, 36, 52, and 40 square feet. The figures for the CEOs were 32, 60, 48, and 36 square
Section 2.1: Frequency Distributions and their Graphs (Note: Scatter plots will be revisited on Unit 8.) 1.The Young Republicans Club asked its members how many hours they had worked during the previous week in part-time jobs. The following data lists the number of hours spent working during the previous week. 6 6 6 4 6 6
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 best measure of central tendency?
If the process variablity steadily increases, we would observe: An alternation pattern of high value followed by a low value on the R-chart, An upward trend on the R-chart, A downward trend on the R-Chart or A increasing gradual funnel pattern on the R-Chart
= - (Show all work) if X = 2.0144, R = 0.0972, and 25 subgroups of size 5 - a. Find the UCL and the LCL for the X chart. b. Find the UCL and the LCL for the R - chart.
Levels of Measurement/Scaling Identify which level of scaling is present in the examples below N = Nominal, O = Ordinal, I = Interval, R = Ratio _____ A high temperature of 83 degrees Fahrenheit _____ A survey result that 24 students work full time, 36, part time. _____ Bill is consistently rated most effective commun
You are a quality analyst with John and Sons Company. Your company manufactures fax machines, copiers, and printers that use plain paper. The CEO of the company wants the machines to handle 99.5 percent of all the paper that is used in them without the paper getting jammed. The CEO asks you to determine the thickness of pape
The number of widgets produced by 9 employees in an eight hour shift is recorded below. Find the mean number of widgets produced. 135, 120, 116, 119, 121, 125, 135, 131, 123 What is the range of widgets produced given in problem presented above? What is the mode of the number of widgets produced presented abo
1. A large mass of data can best be summarized pictorially by means of: a. the range b. a histogram c. the frequency table d. mean and standard deviation 2. For a symmetric distribution, the mean and median are a. the same b. always different c. possi
1. The mean price of 5 items is $7.00. The prices of the first four items are $6.50, $8.00, $5.50 and $6.00. How much does the fifth item cost? 2. The range of a set of numbers is 1,362. The greatest number is 2,172. What is the least number? 3. The mean of a set of 7 numbers is 13. What is the sum of the numbers? 4.
Two workers on the same job show the following results over a long period of time. Worker Worker A B --------------------------------------------------------------------------------
Each response must include your calculations. Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $110,000. This distribution is positively skewed. The standard deviation of the population is not known. PLEAS
Simultaneous equations are a set of equations containing multiple variables. What are two examples of how simultaneous equations are used in business? What are some of the different ways you can satisfy these equations? Please give me a business example, and how you would solve it.
Mean, median, and mode: Computations The following list contains the average annual total returns (in percentage points) for 8 mutual funds. The mutual funds appear in an online brokerage firm's "all-star" list. 23, 16, 9, -5, 40, 36, 16, 21 A - What is the mean of this data set? If the answer is not an integer, roun
Please see the attached file. What Quantitative method / technique is used to determine the attached? Using the attached data, what are the limits for xbar- and R-charts, is this process in control?
What is the weighted mean profit per delivery - a bottling company offers three kinds of delivery service - instant, same day and within 5 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 out directly to a grocery
Refer to the Real Estate data, which reports information on homes sold in the Denver, Colorado, area last year. a. Select the variable selling price. 1. Find the mean, median, and the standard deviation. 2. Write a brief summary of the di
How can the mean and median be used to estimate how well a class does on a test? Explain how extreme value changes each and when each one is appropriate.
Vail Resorts pays part-time seasonal employees at ski resorts on an hourly basis. At a certain mountain, the hourly rates have a normal distribution with standard deviation of $3.00. If 20% of all part-time seaonal employees make more than $13.16 an hour, what is the average hourly pay rate at this mountain? A) $16.16 B) $
1. Distinguish between descriptive statistics and inferential statistics. 2. Distinguish between and independent and a dependent variable - give example. 3. The annual incomes of the five vice presidents of Erlen industries are 75000 78000 72000 83000 90000 a. What is the range? b. What is the arithmetic mea
Assignment I. Automobiles traveling on the New York state Thruway are checked for speed by a state police radar system Compute variance, standard deviation, mean, median, mode, 25 percentile, 75 percentile and 50 percentile for the data. Dinner Check ($) f 25-34 2 35-44 6 45-54 4
For the data in the following matrix: No treatment Treatment Male M=5 M=3 Overall M=4 Female M=9 M=13 Overall M=11 Overall M=7 Overall M=8 A: Describe the mean difference that is the main effect for the treatme
Weighted mean: Tabular data The table below summarizes the number of children per household for a sample of 41 middle-income families. Number of households Number of children 3 4 16 2 12 3 10 6 What is the mean number of children per household for these fam
Weighted mean: Tabular data The following summarizes the number of fiction books read last summer by a sample of 36 students at a certain college. Number of students Number of books 2 1 11 3 12 4 11 7 What is the mean number of books read? Round your answer
Weighted mean: Tabular data The scores on a test for a sample of 40 statistics students are summarized in the following table. Number of students Score 10 90 17 80 13 70 Find the mean score. Round your answer to at least one decimal place.
The data in DJIA.XLS (CD-> browse->Excel_Data_Files) represent the closing value of the Dow Jones Industrial Average (DJIA) over the 24-year period 1979 through 2002. See Problem 15.17. Using EXCEL or PHStat2, answer the following: 1. Find a linear trend equation to these data. a) Y^ = -934.2717 + 452.5928X b) Y^ = 934.2717
Comparing Variations: 1. For the following exercise, complete the following: Find the mean, median, and range for each of the two data sets. Find the standard deviation using the rule of thumb for each of the data sets. Compare the two sets and describe what you discover. The following data sets shows t
What is meant by "central tendency" of data? Use 8 hypothetical data values that might be observed at your workplace and calculate the significant measures of central tendency (mean, median, and standard deviation).