Descriptive Statistics is used when describing certain aspects of an immediate group within the population. For example‚ we may want to describe a math class and compare it to a class of science. Things that we may want to use for comparison would be age‚ gender‚ and even math skills. Descriptive statistics would allow us to analyze all those different areas and provide a comparison to view similarities‚ differences and ratios. Before any study is to be observed certain factors would have to be ascertained
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Research‚ Statistics‚ and Psychology PSY 315 Amber Lupo November 8‚ 2010 Amber Nelson “The definition of scientific method is a method of research in which a hypothesis is tested by means of a carefully documented control experiment that can be repeated by any other researcher” (yourdictionary.com‚ 2010.) “Research is the scholarly or scientific investigation or inquiry” (American Heritage Dictionary‚ 2000.) Primary and secondary data are dependent to each other‚ but also completely
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Population variance = σ2 = Σ ( Xi - μ )2 / N * Variance of population proportion = σP2 = PQ / n * Standardized score = Z = (X - μ) / σ * Population correlation coefficient = ρ = [ 1 / N ] * Σ { [ (Xi - μX) / σx ] * [ (Yi - μY) / σy ] } Statistics Unless otherwise noted‚ these formulas assume simple random sampling. * Sample mean = x = ( Σ xi ) / n * Sample standard deviation = s = sqrt [ Σ ( xi - x )2 / ( n - 1 ) ] * Sample variance = s2 = Σ ( xi - x )2 / ( n - 1 ) * Variance
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were randomly and independently chosen from the populations‚ population distributions are normal for each group; and population variances are equal for all groups. The assumptions of ANOVA are identical to the t-test and the calculated statistic is called an F-value which has a probability value associated with it. As with the t-test‚ if our probability value is less than 0.05 we reject our null hypothesis (in this case that there is no difference among the treatment groups). This p-value
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1 Why probability and statistics? Is everything on this planet determined by randomness? This question is open to philosophical debate. What is certain is that every day thousands and thousands of engineers‚ scientists‚ business persons‚ manufacturers‚ and others are using tools from probability and statistics. The theory and practice of probability and statistics were developed during the last century and are still actively being refined and extended. In this book we will introduce the basic notions
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independent observations by the number of observations in the group that represent one of two outcomes. For example‚ the proportion of individuals in a random sample who support one of two political candidates fits this description. In this case‚ the statistic is thecount X of voters who support the candidate divided by the total number of individuals in the group n. This provides an estimate of the parameter p‚ the proportion of individuals who support the candidate in the entire population. The binomial
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Sampling and Data Collection Plan Amy Nguyen QNT/561 November 3‚ 2014 Dr. Anthony Matias Sampling and Data Collection Plan Population and Size The population would be the customers of Starbucks. The size of the population is 300. Target Population The target population would be the senior‚ middle‚ and young customers of the organization as it would help to find out that how much coffee effect their life. The customers would have more knowledge about the effects of drinking too much coffee daily
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Misunderstandings in Communication Amber Marino BCOM/275 July 17‚ 2012 Mr. John Mago Misunderstandings in Communication Misunderstanding #1 Who was the sender? My Sargent Who was the receiver? Myself What was the message? My Sargent was trying to communicate directions to me of the medical building I had to drop this urgent lab paperwork off to. What channel was used to send the message? Face to face conversation What was the misunderstanding that occurred? His directions on how to get
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STATISTICS - Lab #6 Statistical Concepts: Data Simulation Discrete Probability Distribution Confidence Intervals Calculations for a set of variables Open the class survey results that were entered into the MINITAB worksheet. We want to calculate the mean for the 10 rolls of the die for each student in the class. Label the column next to die10 in the Worksheet with the word mean. Pull up Calc > Row Statistics and select the radio-button corresponding to Mean. For Input variables:
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Declining Fish Stock One major problem we are facing as a country is the rapid decline in several different species of fish in the ocean. Some specialist have actually looked into this to determine the cause for the decline in fish in the ocean. One of the major causes is that some species of fish are being fished more than others. It is even stated that more fish than the species are being able to actually reproduce. This alone could eventually lead some of the species into extinction. This is
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