choices: a. true b. false c. others (specify) 1. The single coefficient α is not enough when there a trend is present in a series 2. The smoothing parameter α cannot be 1. 3. If the smoothing parameter α is high the latest observations has more weights compared to past observations.
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choices:
a. true
b. false
c. others (specify)
1. The single coefficient α is not enough when there a trend is present in a series
2. The smoothing parameter α cannot be 1.
3. If the smoothing parameter α is high the latest observations has more weights compared to past observations.
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- Which of the following statements are true: (1) If both the actual and seasonally adjusted dairy production figures increase then the actual increase was bigger than it usually is. (2) Increases and decreases in seasonally adjusted series cannot be caused by regular seasonal events. (3) If New Zealand suffers a widespread drought this coming summer then a decrease in the actual value of agricultural output is possible but there would be no change in the seasonally adjusted value. Select one: a.(1) and (2) b.(1) and (3) c.(2) and (3) d.(1), (2) and (3)From the graph below relating the holding-period returns for Aram Inc. (in the Y-axis) to the S&P 500 Index (in the X-axis), estimate the firm's beta. Aram's beta is estimated to be about?The population, P, of the city of Hazelton has grown according to the mathematical model P = 65,000(1.075)*, where t is the number of years since 2005. a) At what percentage is the population growing? b) If this trend continues, during which year will the population reach approx. 100,000?
- With the gasoline time series data from table 17.1, show the exponential smoothing forecasts using a = .1.a. applying the MSe measure of forecast accuracy, would you prefer a smoothing constant of a = .1 or a = .2 for the gasoline sales time series?b. are the results the same if you apply Mae as the measure of accuracy?c. What are the results if Mape is used?Suppose that a new company begins its operations in 2020 and the size of the company over the next 10 years is predicted by N ( t ) = t3 − 12t2 + 45 t + 5, 0 ≤ t ≤ 10 where N is the number of employees t years past 2020. In what year the number of employees will be the highest?he "Dogs of the Dow" are the stocks listed on the Dow with the highest dividend yield. The following table shows the top 10 stocks of the "Dogs of the Dow" list for 2015, based on their performance the preceding year. Symbol Company Price ($) Yield T AT&T 33.59 5.48% VZ Verizon 46.78 4.70% CVX Chevron 112.18 3.82% MCD McDonald's 93.70 3.63% PFE Pfizer 31.15 3.60% GE General Electric 25.27 3.48% MRK Merck 56.79 3.17% CAT Caterpillar 91.53 3.06% XOM ExxonMobil 92.45 2.99% KO Coca-Cola 42.22 2.89% You decide to make a small portfolio consisting of a collection of 3 of the top 10 Dogs of the Dow. (a) How many portfolios are possible? portfolios (b) How many of these portfolios contain VZ and MCD but neither KO nor XOM? portfolios (c) How many of these portfolios contain at least two stocks with yields above 3.5%? portfolios
- The best fit line for a time series, {yt : t = 1,2,...,518} is found to be f (t) = 3.4025t + 199.3715. Based on the best fit line, what is the forecast value, when t = 518?1. Pretend that in a certain city the number of new cases of COVID was reported to be 200 new cases on Sunday. Let’s pretend that the number of new cases grows by 22% on Monday, and then after that falls by 22% on Tuesday Question C: What percent would the percent increase have to be on Monday to have a total change of zero% from Sunday to Tuesday? i.e. new covid cases go up by ???% on Monday and then down 22% on Tuesday for a total change of 0%. (Use decimals in answer if needed)Suppose that you just bought a painting for $1million. You plan to sell it exactly one year fromnow. You don’t know what the exact price will bewhen you sell. Nevertheless, you believe thatthere’s a 65% chance that you can sell it for$1.2million, and a 35% chance that you can sell itfor only $900,000. What is your expected gain orloss for this investment?
- Suppose that a particular company estimates its growth income from sales by the formula:dS/dt = 2(t − 1)^2/3where S millions of dollars is the gross income from sales t years. If the gross income from the current year’s sales is $8 million, what would be the expected gross income from sales 2 years from now?Storrs Cycles has just started selling the new Cyclonemountain bike, with monthly sales as shown in the table. First,co-owner Bob Day wants to forecast by exponential smoothingby initially setting February’s forecast equal to January’s saleswith a = .1. Co-owner Sherry Snyder wants to use a three-periodmoving average. a) Is there a strong linear trend in sales over time?b) Fill in the table with what Bob and Sherry each forecast forMay and the earlier months, as relevant.c) Assume that May’s actual sales figure turns out to be 405.Complete the table’s columns and then calculate the meanabsolute deviation for both Bob’s and Sherry’s methods.d) Based on these calculations, which method seems moreaccurate?For each situation, formulate the appropriate null and alternative hypotheses H0 and Ha. 1) The average final grade of past STATPRO students is known to be 82%. It is believed that there has been an increase in the average grade in the term that just ended. 2) A certain chemical pollutant in the Pasig River has been constant for several years with mean μ = 34 ppm (parts per million). A group of industry representatives claim that their waste management programs have lowered this average significantly. 3) An actress would like to try a diet program. She intends to adopt the diet only if the average weight loss after the program is greater than 15 pounds. 4) Lobbyists of cigarette manufacturing firms claim that the average nicotine content of their cigarettes is less than 3 mg. 5) A bank employee claims that, on the average, their non-ATM customers wait for at most ten minutes before they are served. To disprove this claim, Alex randomly selected 20 customers during banking hours…