year the following relationships are possible: Economic Status Probability Rate of Return Weak Economy .15 -5% Static Economy .60 5% Strong Economy .25 15% 9 What is your expected rate of return [E(Ri)] for next year? 10 Compute the standard deviation of the rate of return for the one year period. 11 Compute the coefficient of variation for your portfolio. USE THE FOLLOWING INFORMATION FOR THE NEXT TWO PROBLEMS Assume that during the past year the consumer price index increased by 1.5 percent
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(20 points) Find and compare the standard deviations of the salaries and ages of the employees in the sales and advertising departments. Tell how you would you explain the meaning of these values when you present them to the owner.Answer: sales department the deviations for the salaries of the sales department is:16.6 the deviations for the ages of the sales department is: 7.1 advertising department the deviation for the salaries of the advertising department is: 17
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An experiment investigating the effects of interference on speed estimates during the Stroop task Nicharee Thamsirisup (Nid) IB Psychology Standard Level Abstract: This experiment is to investigate the effect of color interference in speed estimates of the Stroop task which was first researched by John Ridley Stroop in 1935. This can be investigated by seeing the time difference between the task of identifying colors when color words are printed in the same color as their semantic meaning
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Part 1 Alan Green needs to answer the decision problem of whether charging fees for online banking use is more profitable for Pilgrim Bank than offering incentives to promote wider use of the online channel. To begin solving the problem‚ Mr. Green first must address the following research issues: how much more/less profit do online users generate; is this difference significant‚ what are the measures of customer profitability‚ what are the characteristic of the bank’s online users and profitable
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highest income‚ the minimum being 4‚018.44 and the maximum being 995‚610.14. Statistics Household Income N Valid 70 Missing 0 Std. Deviation 291786.49129 Variance 85139356497.915 Standard deviation and variance: The average distance of the observations from the mean is 291786.49129 and the variance is simply the square of the standard deviation. This denotes that the household incomes are extremely dispersed from each other. Statistics Household Income N Valid 70
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Statistics – Case Chapter 9 1. It is not proper to multiply the average order size by the number of addresses (1.3 million people = population) in the target mailing because the sample is representative of the 600‚000 people in the database‚ not the 1.3 million target population‚ thus you cannot use the average of the sample as an estimate for the population. Also‚ multiplying by 1.3 million would suggest that the entire 1.3 million people would be purchasing. 2. It is better to multiply the endpoints
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+ 0.35(18%) + 0.3(-10%) + 0.15(10%) = 7.2% The standard deviation is: 2J = 0.2(0.12 – 0.072)2 + 0.35(0.18 – 0.072)2 + 0.3(-0.1 – 0.072)2 + 0.15(0.1 – 0.072)2 = 0.0135 J = = 11.63% 2. Answers: The average return and standard deviation of Large co. stock return is: Sum of Large co. stock = -14.69 – 26.47 + 37.23 + 23.93 – 7.16 + 6.57 = 19.41 Mean = Sum/N = 3.235 Large = = The average return and standard deviation of T-bill return is: Sum of T-bill = 7.29 + 7.99 + 5.87 + 5.07 +
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of Standard Deviation In statistics and probability theory‚ standard deviation shows how much variation or "dispersion" exists from the average (mean‚ or expected value). A low standard deviation indicates that the data points tend to be very close to the mean‚ whereas high standard deviation indicates that the data points are spread out over a large range of values 2.3 Definition of Coefficient of Varience The coefficient of variation represents the ratio of the standard deviation to the mean‚
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Gender Discrimination: A Statistical Analysis Gender discrimination‚ or sex discrimination‚ may be characterized as the unequal treatment of a person based solely on that person ’s sex. . It is apparent that gender discrimination is pervasive in the modern workplace‚ however‚ its presence and effects are often misrepresented and misunderstood. Statistical testing plays an important role in cases where the existence of discrimination is a disputed issue and has been used extensively to compare expected
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Statistics: Median‚ Mode and Frequency Distribution Given a list of numbers‚ The median is the “middle value” of a list. It is the smallest number such that at least half the numbers in the list are no greater than it. If the list has an odd number of entries‚ the median is the middle entry in the list after sorting the list into increasing order. If the list has an even number of entries‚ the median is equal to the sum of the two middle (after sorting) numbers
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