total sum of the value of the squares and divide by the number of values minus one. The standard deviation is .55. Construct a 95% confidence interval for the ounces in the bottle. The 95% confidence interval can be found by using the t distribution. The sample mean plus and minus (2.045) times the standard deviation/ square root of 30. The confidence interval is 95% in Table F and the df = 29 which is 2.045. 14.87 – 2.045 times .55/square root of 30 = 14.66 14.87 + 2.045 time .55/square root
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Mean =AVERAGE() Weighted Mean =SUMPRODUCT(weights, values) / n Where n = SUM(weights) Median =MEDIAN() Mode =MODE() Range =MAX()-MIN() Class Width =range / number of classes All Versions of Excel Excel 2010 Variance Sample: =VAR() =VAR.S() Population: =VARP() =VAR.P() Standard Deviation (SD) Sample: =STDEV() =STDEV.S() Population: =STDEVP() =STDEV.P() Or,=SQRT(variance) Or, =variance^0.5 Skewness =3*(AVERAGE() - MEDIAN()) / SD Coefficient of Variation =SD / AVERAGE()
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selling price on the variable in the data set to determine which are significant and how the significant variables affect the price. Please note the following: • All analysis is based on the given data set. • All hypotheses are based on a confidence level of 95%. • Each variable group is tested against the same selling price data. Part I Variable 1 Convertible against selling price Null hypothesis: There is no relationship between convertible and selling price. Alternate hypothesis:
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statistic, 6. level of significance for testing 3. TEST STATISTIC (or Confidence Interval Structure) 1. structure to be used to test significance levels or set of confidence intervals (be sure to include the equations & notation) 2. special conditions to be met by statistic 4. REJECTION REGION (or Probability statement) Expected measure of the test statistic as generated from tables or critical valve for a confidence interval. Yes, before you start the calculations you should inform the reader
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Anti piracy law enforcement: H0: Anti piracy law enforcement does not influence laptop computer market in Bangladesh. H1: Anti piracy law enforcement influences laptop computer market in Bangladesh. Here the confidence interval, α = 0.05 (95%) One-Sample Test Test Value = 3 95% Confidence Interval of the Difference t anti piracy law enforcement df -.740 Sig. (2-tailed) 29 Mean Difference .465 -.167 Lower Upper -.63 .29 Statistical Statement: From the above table we see that probability is
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9.1 | The Constant-Growth-Rate Discounted Dividend Model, as described equation 9.5 on page 247, says that:xx P0 = D1 / (k – g) | | A. | rearrange the terms to solve for: i. g; and ii. D1. As an example, to solve for k, we would do the following: 1. Multiply both sides by (k – g) to get: P0 (k – g) = D1 2. Divide both sides by P0 by to get: (k – g) = D1 / P0 3. Add g to both sides: k = D1 / P0 + g (8 marks) | 9.2 | Notation: Let Pn = Price at time nDn = Dividend
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following. Show your work (by hand or software output). Calculate appropriate descriptive statistics. Create a histogram and assess normality. What are the raw scores that correspond to +/- 1.96σ and +/-3σ? Calculate a CI for the mean. You pick the interval, e.g., 95%. Test µ = 10.0. You select the Type I error rate. Calculate appropriate descriptive statistics. The data follows: Product
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population mean for the confidence interval with a lower bound of 25 and an upper bound of 35. 3) _____ A) 35 B) 25 C) 30 D) 31 4) Compute the critical value z* that corresponds to a 94% level of confidence. 4) _____ A) 1.96 B) 1.645 C) 2.33 D) 1.88 5) In a sample of 10 randomly selected employees, it was found that their mean height was 63.4 inches. From previous studies, it is assumed that the standard deviation, σ, is 2.4. Compute the 95% confidence interval for μ. 5) _____ A) (59
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value liesZ score = data value – mean Standard deviation | Metric Data = ExploreCategory = Frequencies | Bigger sample size will give a narrower confidence interval range (more specific) outliers affect the mean but not the median – this is why the median is preferred here. | | Reports -Only give confidence interval if signicant-All values to 2 dec pts except the p-value Experimental = IV is manipulated to see the effect on the DV Observational = Information just observed &
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sier!™ ing Everything Ea Mak ta t i s t i c s S e nt ia l s Ess Learn: • Exactly what you need to know about statistical ideas and techniques • The “must-know” formulas and calculations • Core topics in quick, focused lessons Deborah Rumsey, PhD Auxiliary Professor and Statistics Education Specialist, The Ohio State University Statistics Essentials FOR DUMmIES ‰ by Deborah Rumsey, PhD Statistics Essentials For Dummies® Published by Wiley Publishing, Inc. 111 River St
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