MBA 604 Introduction Probaility and Statistics Lecture Notes

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3 Numerical methods Measures of Central Measures of Dispersion Tendency (Variability) 1. Sample mean 1. Range 2. Sample median 2. Mean Absolute Deviation (MAD) 3. Sample mode 3. Sample Variance 4. Sample St<strong>and</strong>ard Deviation I. Measures of Central Tendency Given a sample of measurements (x1,x2, ···,xn) where n = sample size xi = value of the ith observation in the sample 1. Sample Mean (arithmetic average) x = x1+x2+···+xn or x = x Example 1: Given a sample of 5 test grades (90, 95, 80, 60, 75) then x = 90 + 95 + 80 + 60 + 75 = 400 x = x n n n = 400 5 =80. Example 2: Letx = age of a r<strong>and</strong>omly selected student sample: (20, 18, 22, 29, 21, 19) x = 20 + 18 + 22 + 29 + 21 + 19 = 129 x = x n = 129 6 =21.5 2. Sample Median The median of a sample (data set) is the middle number when the measurements are arranged in ascending order. Note: If n is odd, the median is the middle number 9
If n is even, the median is the average of the middle two numbers. Example 1: Sample (9, 2, 7, 11, 14), n =5 Step 1: arrange in ascending order 2, 7, 9, 11, 14 Step 2: med = 9. Example 2: Sample (9, 2, 7, 11, 6, 14), n =6 Step 1: 2, 6, 7, 9, 11, 14 Step 2: med = 7+9 2 =8. Remarks: (i) x is sensitive to extreme values (ii) the median is insensitive to extreme values (because median is a measure of location or position). 3. Mode The mode is the value of x (observation) that occurs with the greatest frequency. Example: Sample: (9, 2, 7, 11, 14, 7, 2, 7), mode = 7 10
Page 1 and 2: MBA 604 Introduction Probaility and
Page 3 and 4: Contents 1 Data Analysis 5 1 Introd
Page 5 and 6: 10 Simple Linear Regression and Cor
Page 7 and 8: 7. How to interpret polls. How many
Page 9: Formulas: Note: w = 28.6−5.4 6 w
Page 13 and 14: II. Measures of Variability Given:
Page 15 and 16: x x 2 90 8100 85 7225 65 4225 75 56
Page 17 and 18: (iii) Approximation: s range 4 (iv
Page 19 and 20: z = x − µ σ Example. A set of g
Page 21 and 22: (i) Complete all entries in the tab
Page 23 and 24: Chapter 2 Probability Contents. Sam
Page 25 and 26: nA = frequency of the event A nA n
Page 27 and 28: provided P (B) > 0. Similarly, P (B
Page 29 and 30: Thus only 32 percent of those perso
Page 31 and 32: (which is equal to Combinations For
Page 33 and 34: 2. Suppose that S = {1, 2, 3, 4, 5,
Page 35 and 36: (Hint: Start by defining the events
Page 37 and 38: The variable X transforms the probl
Page 39 and 40: 3 Discrete Distributions Binomial.
Page 41 and 42: of D elements of the first kind and
Page 43 and 44: One equation is redundant. Choose t
Page 45 and 46: 4. A random variable X has the foll
Page 47 and 48: 1. List the properties for a binomi
Page 49 and 50: Chapter 4 Continuous Distributions
Page 51 and 52: Z-score: OR (simply) Conversely, X
Page 53 and 54: Exercise. Specialize the above resu
Page 55 and 56: 3. Let Z be a standard normal distr
Page 57 and 58: Chapter 5 Sampling Distributions Co
Page 59 and 60: σ ˆP = S.E.( ˆ pq P )= n (iii)
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(ii) Find the probability that the
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Single Quantitative Population: µ
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where σ is estimated by s. Note: I
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The width of the CI decreases. The
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Please show all work. No credit for
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Chapter 7 Large-Sample Tests of Hyp
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Conclusion: At 100α% significance
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1. Large sample (np ≥ 5,nq≥ 5)
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Test: Sample 2: n2, x2, ˆp2 = x2 n
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orders were recorded, with a sample
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1. Sampled population is normal 2.
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Sample data: Sample 1: n1, x1,s1 Sa
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SUBC> alternative 1. Note: alternat
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RR: Reject H0 if t>2.776 or t X 2
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Q1: Do the data present sufficient
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Training Group 1 2 3 4 65 75 59 94
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GT: Grand Total. Computational Form
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Treatments t1 t2 t3 Bi s1 17 34 23
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Solution to (ii) Test. H0 : µ1 =
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Chapter 10 Simple Linear Regression
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3. The r.v. ɛ has a normal distrib
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Optional material Ad Sales Calculat
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Estimator mean: µ β1 ˆ = β1 Est
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(ii) The population coefficient of
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The regression equation is y=46.5 +
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Source DF SS MS F P Regression 7626
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4. The random components of any two
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MINITAB. Use REGRESS command to reg
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Q1. What is the prediction equation
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MBA 604 Introduction Probaility and Statistics Lecture Notes

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