Basics of Statistics Jarkko Isotalo 30 20 10 Std. Dev = 486.32 Mean = 3553.8 N = 120.00 0 2400.0 2800.0 2600.0 3200.0 3000.0 3600.0 3400.0 4000.0 3800.0 4400.0 4200.0 4800.0 4600.0 5000.0 Birthweights of children during years 1965-69 Time to Accelerate from 0 to 60 mph (sec) 30 20 10 0 0 Horsepower 100 200 300 1 Preface These lecture notes have been used at Basics of Statistics course held in University
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Table of Contents 1.1 plan for the collection of primary and secondary data In order to understand the response or view of the customers about the store‚ primary and secondary data needed for Shark Spin are as follows: Primary Data: In order to do whatever survey needs to be conducted is known as primary data (Bpp‚ 2004‚ p7). Survey can be done to investigate Customer’s response information. What customers expect from the firm. What they think needs to be
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be analyzed is how to measure forecast error by using three of the most popular measures. Forecast error shows “how well the model performed against itself using past data” (Heizer & Render‚ 2010). One measure will be looking at the mean absolute deviation (MAD) which
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Group 7 MOTION PICTURES INDUSTRY- CASE STUDY The data collected for a sample of 100 motion pictures produced in 2005 is given below. A survey is carried out to analyze how different variables of the Motion Picture Industry contribute to the success of its motion pictures. The study focuses on four major variables‚ Opening Gross Sales‚ Total Gross Sales‚ Number of Theatres and weeks in top 60. Motion Picture Opening Gross Sales( $millions) Total Gross Sales ($ millions) Number of Theaters
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mode; range; quartiles; variance; standard deviation. Solution: A sample is a subset of a population. A population consists of every member of a particular group of interest. The variance and the standard deviation require that we know whether we have a sample or a population. 2. The following numbers represent the weights in pounds of six 7year old children in Mrs. Jones ’ 2nd grade class. {25‚ 60‚ 51‚ 47‚ 49‚ 45} Find the mean; median; mode; range; quartiles; variance; standard deviation. Solution:
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Statistics Project Average Annual Price of Gasoline from 1990 to 2010 Adjusted For Inflation Purpose: To analyze the price fluctuations of gasoline over a period of time between 1990 and 2010 using the annual average across all regions and gasoline grades and adjusted to today’s dollar. Procedure: Historic gasoline prices are maintained by the Department of Energy on a weekly basis dating back between 16 and 21 years depending on the grade of gasoline and region of the United States where
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Natural Products Experiment Niki Robinson 10008562 Practical 2: Identification and quantification of taxifolin from milk thistle Aim: to Identify and quantify the amount of taxifolin from three samples Silymarin stock solution‚ taxifolin and silybum marianum extract. ` Methodology: Using auto-pipette (20-100 microlitre)‚ pipetted 0.06 mg of Taxifolin was added to 10ml conical flask and made up to the mark (10ml) with H2O.This procedure was repeated with the same amounts foe silymarin stock
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minimum age to maximum from ages 35 to 55. Mock data for the independent variables for Melks. Descriptive statistics Income Age Count 300 300 Mean 56‚426.45 45.91 sample standard deviation 3‚876.30 7.23 sample variance 15‚025‚706.87 52.29 Minimum 50000 34 Maximum 60000 55 Range 10000 21 confidence interval 95.% lower 54‚135.75 41.64 confidence
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Statistics @ SNU‚ 2013 Spring Thursday‚ March 21‚ 13 QuantPsych Questions IQ is intended to be normally distributed with a mean of 100 and a standard deviation of 15 • • • • Generate a data set of 400 imaginary subjects’ IQ Report the following descriptive statistics of the generated data set • • mean‚ variance‚ range‚ quartile scores‚ interquartile range Tip. summary() can be helpful Draw a histogram and a box plot Based on the above analyses‚ how many data points of your data
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of centre and spread‚ and any other points you feel may be of interest. b) The survey results were described as being symmetrically distributed. What does this mean‚ and what evidence is there below to support this claim? c) The standard deviation of the ratings for the Private Account holders is 1.336. What does this value mean? d) Verify the value of the standard error of the mean (SE Mean) for the Business Account holders. e) Determine a 90% confidence interval for the true mean
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