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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Elementary Statistics Chapter 1 Test - Form A Name:___________________________ Course Number: __________ Section Number: _____ SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 1) Define the terms population‚ sample‚ parameter and statistic. How does a census compare to a sample? MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Identify the number as either
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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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Cell Phone Statistics There is little doubt about the appeal of cellular telephones. They enable us to stay connected with friends and family through voice calls‚ email and texts. They can access the Internet for local and world news‚ help us navigate to a desired location‚ play games‚ take photographs or record videos‚ and many other capabilities. A report by the Australian Telecommunications Association and the Australian National University (Wajcman‚ Bittman‚ Jones‚ Johnstone
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CHAPTER 1 Introduction 1.1 Background to the Study Solid waste is material that has no economic value at present‚ or material perceived as not having value at any given time and to a particular society (Ambasht 1999). Waste‚ garbage‚ trash‚ junk and refuse are all names given to that “stuff” that is no longer useful in its current form. In contemporary society‚ many of the items used daily are designed to be used and discarded. Thus‚ with the increased availability of disposables has come
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□ EXERCISE 16 Questions to be Graded 1. The researchers analyzed the data they collected as though it were at what level of measurement? d. Experimental 2. What was the mean posttest empowerment score for the control group? The mean posttest empowerment score for the control group was 97.12 3. Compare the mean baseline and posttest depression scores of the experimental group. Was this an expected finding? Provide a rationale for your answer. The mean baseline depression score of
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Class: _Statistics____________Date: □ EXERCISE 16 Questions to be Graded 1. The researchers analyzed the data they collected as though it were at what level of measurement? d. Experimental 2. What was the mean posttest empowerment score for the control group? The mean posttest empowerment score was 97.12 3. Compare the mean baseline and posttest depression scores of the experimental group. Was this an expected finding? Provide a rationale for your answer. The mean baseline depression score
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STATISTICS PROJECT The balance is a interval‚ numerical and continuous variable. The ATM is a ratio‚ numerical‚ discrete variable. Services is a ratio‚ numerical‚ discrete variable. Debit‚ interest and city are a categorical‚ nominal variable. As the graph‚ shows below‚ the balance of the typical customer‚ otherwise known as the mean is equal to 1499.87. 12 customers have more than $2‚000 in their account. This number is relatively high because the account balances tend to cluster
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