Weight Reducers International‚ advertises that those who join will lose‚ on the average‚ 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of significance‚ can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value. Answer: H0: = 10 pounds H1: < 10 pounds Reject the null hypothesis
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Pakistan Journal of Meteorology Vol. 9‚ Issue 17: Jul 2012 Rainfall Trends in Different Climate Zones of Pakistan Salma‚ S.1‚ S. Rehman1‚ M. A. Shah2 Abstract In this paper‚ the study was conducted across the country to assess the rainfall trend in different climate zones of Pakistan over the past three decades. For this purpose dataset comprising 30 years for the period 1976 to 2005 were acquired from 30 meteorological observatories from different parts of the country. The whole data was
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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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theorists‚ the mean winning bid price in the “rigged” market will exceed the mean winning bid price in the competitive market for each year in which collusion occurs. In addition‚ the difference between the competitive average and the “rigged” average tends to grow over time when collusionary tactics are employed over several consecutive years. Comparison of difference in mean winning bid price between Tri-county and surrounding area per year per product YEAR | Difference in mean winning bid
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1. A radio station that plays classical music has a “By Request” program each Saturday night. The percentage of requests for composers on a particular night are listed below: Composers Percentage of Requests Bach 5 Beethoven 26 Brahms 9 Dvorak 2 Mendelssohn 3 Mozart 21 Schubert 12 Schumann 7 Tchaikovsky 14 Wagner 1 a. Does the data listed above comprise a valid probability distribution? Explain.
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sample. 2) Data Analysis From X-bar chart of Figure 2‚ there are only five points (12.5833‚ 18.6667‚ 12.9167‚ 17.9167‚ and 12.9167) are close to the UCL or LCL‚ others are fluctuating around the average of sample mean. Given that X-bar chart monitors the changes in the mean of a process‚ we can conclude that the tendencies of the average grind time are centralized. More importantly‚ we have to pay attention on the R-chart of the grind time. We can see that there are up to 16/37 points close
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the gas mileage. What does it mean? 4- Compute the correlation coefficient between the speed and the gas mileage. What does it mean? 5- Graph a histogram of speed. Comment on the distribution of the speed. 6- Graph a histogram of gas mileage. Comment on the distribution of the mileage. II. Descriptive Statistics 1. For each variable (speed and mileage) in the table above‚ find mean‚ median‚ and mode. Mean Speed = Median X = Mode X = Mean Mileage = Median Y = Mode Y
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Step 1- Identify the problem Develop a problem statement- What are you going to investigate (use the 6 characteristics of a good problem statement) 1. Be interested in the problem 2. Have a manageable scope 3. Be comfortable in terms of the knowledge‚ time‚ and resources needed to investigate the problem 4. Be able to collect and analyze numerical data 5. Must be a practical or theoretical reason for you to research the problem 6. It must be ethical for you to investigate the problem
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1. How many respondents said they drink because their friends drink? _________________ 2. What is the mean age of the respondents? _________________ 3. What is the modal response (most common response) to the question about when drinking occurs on Saturday? _________________________________ Create a new variable SENIORS from CLASS: 1 for those who are seniors‚ 2 for all others. Be sure to use the “All others” choice. There is no need to specify “system-missing to system-missing”
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Relative to the median‚ where would you expect the mean of the distribution to lie? Explain briefly. The distribution is skewed left‚ so the mean will be left of the median. d. What percent of the observations lie below 0.5? Above 1.5? 2. The following are the salaries of employees in a small business: 15‚000 15‚000 17‚500 23‚500 23‚750 25‚000 26‚000 27‚500 29‚000 45‚000 a. Before using your calculator‚ do you think that the mean or the median for these values will be higher? Why do you think so
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