for each question (no explanation is needed)‚ put your answers in the table on page 4. 1. Suppose you have a sample x1 ‚ x2 ‚ . . . ‚ xn from a population. Which of the following has different unit as sample mean? (A). population mean (B). sample variance (C). standard error (D). single observation xi for i = 1‚ 2‚ . . . ‚ n 2. In paired t-test with sample size n1 = n2 = 20‚ you have H0 : µ = 0 vs. Ha : µ < 0‚ the t-statistic is 3.4. what is the p-value? (A). 1 - pt(3.4‚ 20) (B). 1 - pt(3.4‚ 19)
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24.32% 3.15% Foreign Equity 14.44% 12.42% 30.87% 3.83% Bonds 11.10% 5.40% 10.83% 0.58% REITs 13.54% 9.44% 9.91% 0.94% Commodities 18.43% 10.05% 24.07% 2.42% Total 100.00% 10.92% 0.815960738 Portfolio Mean Return 10.92% Portoflio Variance 0.90% Portfolio S.D 9.46% Calculation of Covariance (Do Not Alter Formula) Correlation Matrix US Equity Foreign Equity Bonds REITs Commodities US Equity 1 0.62 0.25 0.56 -0.02 Foreign
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M2 Group Assignment Instructions Complete the Assignment‚ name it as GroupXX_Assign2.xls (where XX is your Group Name)‚ and upload and submit to the instructor through Dropbox. Do not enter anything in the spreadsheet cells that are black‚ labeled “Grader”. You must complete this assignment without the assistance of persons other than the members of your Group. You may use any other resources you deem necessary. Answer the questions below by placing the appropriate graph and/or answers in the designated
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to a camp. If 15% of the children in the school are first graders‚ and the 18 children are selected at random from among all 6 grades at the school‚ find the mean and variance of the number of first graders chosen? The mean is 2.7‚ and the variance is 2.3. n = 18 p = .15 q = .85 Mean = np = 18 x .15 = 2.7 Variance = npq = (18 x .15 x .85) = 2.295 ≈ 2.3 3. A producer plans an outdoor regatta for May 3. The cost of the regatta is $8000‚ which includes advertising‚ security‚ printing
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following is a random sample of six entertainment expenses (dinner costs for four people) from expense reports submitted by members of the sales force. $157‚ $132‚ $109‚ $145‚ $125‚ $139. Calculate the mean and sample variance(s^2) and standard deviation. Mean = 807/6 = 134.5. Sample Variance = (109925 – (807^2/6)/6-1 = (109925 – 108541)/5 = 1384/5 = 276.8. Standard Deviation = √276.8 = 16.6373. ***the 109925 is all values of x individually squared and then summed together. ***the 6-1 is because it
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half fall above). Middle number in a sorted list. If population is an even number‚ divide between neighbors on the midpoint. Mode = most frequent score Deviation = (X - M) Sum of Squares (SS) = ∑ (X - M)^2 Variance = ∑ (X - M)^2 / N (mean squares) Standard Deviation = sqrt of variance Pearson product-moment correlation coefficient (r): degree to which X and Y vary together‚ relative to the degree to which they vary independently Sum of cross products SPxy: Measure of the degree to which
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probability that it will rain‚ we move from pure simulation to Monte Carlo. The reason for this distinction is that there may be other ways to define A that make it easier to estimate. This process is called variance reduction‚ since most of the error in A is statistical. Reducing the variance of A reduces the statistical error. We often have a choice between Monte Carlo and deterministic methods. For example‚ if X is a one dimensional random variable with probability density f (x)‚ we can estimate
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Grenoble Ecole de Management | Research Methodology Project | Correlation between social media and emotional stability | | Christian Morris Karla LukicXinyun MA | 2014/5/5 | Research Question Does social media has impact on the emotional stability of students? Hypotheses: H1: Females have the same ability to handle personal problems as males. H2: There is higher proportion of females that frequently use social media applications for personal reasons than males. H3: Frequency
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2nd Individual Variable is Income: Knowing the income of customers gives us an idea of what socio-economic group is shopping at the AJ Davis department store. Descriptive Statistics: Income ($1000) Variable Mean SE Mean StDev Variance Minimum
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STA304 H1 S/1003 H S Winter 2013 Dragan Banjevic (I) Note: A lot of material will be used from Internet‚ some with reference‚ some without. 2 CITY OF TORONTO NEIGHBOURHOODS 1 West Humber-Clairville 19 Long Branch 36 Newtonbrook West 54 O’Connor-Parkview 2 Mount Olive-SilverstoneJamestown 20 Alderwood 37 Willowdale West 55 Thorncliffe Park 3 Thistletown-Beaumond Heights 21 Humber Summit 38 Lansing-Westgate 56 Leaside-Bennington 4 Rexdale-Kipling
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