lowest production of milk is Tasmania contributing only approximately 3% of to the total milk production in 2007-08. QUESTION 4 Net profit after tax ($000) Descriptive Statistics | | Mean | 1105558.87 | Standard Error | 350420.60 | Median | 258170.50 | Mode | #N/A | Standard Deviation | 2575055.01 | Sample Variance | 6630908324092.04 | Kurtosis | 21.74 | Skewness | 4.38 | Range | 15812994.00 | Minimum | -3594.00 | Maximum | 15809400.00 | Sum | 59700179.00 |
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Chapter 10: Comparing Two Groups Bivariate Analysis: Methods for comparing two groups are special cases of bivariate statistical methods – Two variables exist: Response variable – outcome variable on which comparisons are made Explanatory variable – binary variable that specifies the groups Statistical methods analyze how the outcome on the response variable depends on or is explained by the value of the explanatory variable Independent Samples: Most comparisons of groups use independent samples
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parameter values involved in a t-test. The t-test is more sensitive to minor differences between sample and population. With the t-test one can be confident of the normality of the data. The t-test requires no parameter standard error of the mean. Points Received: 0 of 1 Comments: Question 2. Question : If a certifying agency raises the requirements for real estate agents, what sort of decision error is the agency protecting against? Student Answer:
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BSuppose that 5000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1000 invoices, and stratum 4 contains 3450 invoices. A sample of 500 sales invoices is needed. a) what type of sampling should you do? why? A stratified random sampling is suitable for this study. This is because the population of invoices is heterogenous which results in increase in the variance of the estimators. When the population is divided
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This essay is based on the 2007 book The Black Swan: The Impact of the Highly Improbable by Nassim Nicholas Taleb (1960 - ). It is hardly an obscure tome, having been on the New York Times bestseller list for several weeks. Before I get to the essence of this essay I believe explaining what the term “Black Swan” means and saying a few words about the author would be in order. It was once thought in the Old World that only white swans existed. Then from Australia came the realization that there
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best completes the statement or answers the question. Provide an appropriate response. 1) The following frequency distribution analyzes the scores on a math test. Find the class boundaries of scores interval 40-59. Scores 40-59 60-75 76-82 83-94 95-99 Number of students 2 4 6 15 5 1) A) 39.5, 58.5 B) 40.5, 59.5 C) 39.5, 59.5 D) 40.5, 58.5 2) 2) The frequency distribution below summarizes employee years of service for Alpha Corporation. Determine the width of each class. Years of
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= 52.643, sx = 17.922, sy = 25.430, r = 0.718 ∑(yi–ŷi)2 = 27278.82 We had calculated: The slope and intercept of the sample line of best fit: * sample line of best fit: y= -16.443 + 1.019 x An estimate for σ (standard deviation about the population line): se Given SSE = ∑(yi–ŷi)2 = 27278.82 : se2=SSEn-2=27278.8288-2=317.196 →σ≈se=317.196=17.810 Stat 141 R1 - Lecture #35 page 3 Inference for the population slope β1 When the 4 basic assumptions
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STATISTICAL TABLES CONTENT TABLE 1: CUMULATIVE DISTRIBUTION FUNCTION OF THE STANDARD NORMAL DISTRIBUTION TABLE 2: CRITICAL VALUES OF THE t DISTRIBUTION AND CONFIDENCE LEVELS TABLE 1: CUMULATIVE DISTRIBUTION FUNCTION OF THE STANDARD NORMAL DISTRIBUTION F(Z) F(Z) THE CUMULATIVE STANDARDISED NORMAL DISTRIBUTION TABLE: VALUES DENOTE AREA TO THE RIGHT OF THE Z SCORE P (Z ≥ z0) Z | Second decimal place in z | | 0.00 | 0.01 | 0.02 | 0.03 | 0.04 | 0.05 | 0.06 | 0.07 | 0.08 | 0.09
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Tests of Hypotheses: z-test and t-test 0801-HypothesisTests.doc Page 1 of 4 NOTES TESTS OF HYPOTHESES As was mentioned earlier, sometimes we cannot survey or test all persons or objects; therefore, we have to take a sample. From the results of analysis from the sample data, we can predict the results from the population. Some questions that one may want to answer are 1. Are unmarried workers more likely to be absent from work than married workers? 2. Are the sixth graders in a certain school
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DATA ANALYSIS for MANAGERS MScBA Instituto Universitário de Lisboa (ISCTE-IUL) JOSÉ DIAS CURTO dias.curto@iscte.pt 2015/2016 i Contents Contents 1 Math introductory concepts 1 1.1 The real numbers system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 The concept of sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Relations and functions . . . . . . . . . . . . . . . . . . . . . . .
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