Examples of population and sample statistics
[DOCX File]Purdue University - Department of Statistics
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(a) population: a. ll . Stat 113. s. tudents. this semester (b) individual: a . Stat 113. s. tudent. this semester (c) variable: whether or not a student will. end up with an A. The mean income of all subscribers to a particular magazine is . $26000. We draw a random sample of 100 subscribers and find that their mean income is . $27300 ...
[DOC File]CHAPTER 8 INTRODUCTION TO HYPOTHESIS TESTING
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This is a very strong assumption in Statistics. Independent samples . A test of difference of population means can be one-tailed or two-tailed depending on the alternate hypothesis. For lower-tail tests: Ho: 1> 2 or 1 - 2 > 0. Ha: 1< 2 or 1 - 2 < 0. Use Zstatistic, when population variances are known ( …
[DOCX File]Describing and Interpreting Data
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Examples: US Census describes the US population at a given point in time - presents information re the population such as gender, race, income… Inferential . statistics are used to make generalizations about the population by investigating a sample from the population. Identify the Experimental unit /variable(s) of interest
[DOC File]Sampling Reese’s Pieces Activity
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Mean of a sample: or . Population proportion: Sample proportion: Standard Deviation of population: Standard Deviation of sample: or . 1. Classify each underlined number as a parameter or a statistic. Give the appropriate notation for each. Forty-five percent of all Reese’s Pieces are orange. You take a sample of 30 Reese’s Pieces and find ...
[DOC File]The Practice of Statistics
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Explain how the behavior of the sample mean and standard deviation are similar to the sample proportion. The mean and standard deviation of a population are parameters. What symbols are used to represent these parameters? The mean and standard deviation of a sample are statistics. What symbols are used to represent these statistics?
[DOC File]Sampling Reese’s Pieces Activity
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As the sample size increases, what happens to how well the sample statistics resemble the population parameter? Now, describe the effect of sample size on the distributions of sample statistics. Note: When we generate sample statistics and graph them we are generating an estimated SAMPLING DISTRIBUTION, or a distribution of the sample statistics.
[DOC File]STAT 515 --- Chapter 3: Probability
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• Typically a parameter cannot be calculated from sample data. • A statistic is a function of random variables. • Given the data, we can calculate the value of a statistic. Examples of statistics: Order Statistics • The k-th order statistic for a sample X1, X2, …, Xn is denoted X(k) and is the k-th smallest value in the sample.
[DOC File]Example 1: Sampling Words
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sample. from this population. In most studies, we do not have access to the entire population and can only consider results for a sample from that population. The goal is to learn something about a very large population (e.g., all American adults, all American registered voters) by studying a sample.
[DOC File]HYPOTHESIS TESTING: AN EXAMPLE
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To test the effectiveness of the herbal mix, a researcher obtains a sample of 8 participants and asks each person to take the suggested dosage each day for 4 weeks. At the end of the 4-week period, each individual takes a standardized memory test. In the general population, the standardized test is known to have a mean of μ = 7. Step 1.
[DOC File]STATISTICS - SUMMARY
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Correlation coefficients from a sample tell how strong the relationship is in the sample, not whether you can generalize this to the population. There is a test of whether a correlation coefficient is significantly different from zero that evaluates generalizability from the sample correlation to the population …
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