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Study Resources (Statistics)

  Multiple Choice - Quiz C     EU (European Union) countries report that 46% of their labour force is female. The United Nations wants to determine if the percentage of females in the Canadian labour force is the same. Representatives from Statscan plan to check a random sample of over 10,000 employment records.
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  Multiple Choice - Quiz C     Insurance companies track life expectancy information to assist in determining the cost of life insurance policies. Last year the average life expectancy of all policyholders was 77 years. ABI Insurance wants to determine if their clients now have a longer life expectancy, on average, so they.
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Short Answer - Quiz A   1) What are the 2 assumptions and 3 conditions of the Central Limit Theorem? Explain these.           2) It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. a.  Describe the sampling distribution.
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  Short Answer - Quiz B   1) Data on Internet usage (per 100 inhabitants) and population were collected for a sample of 52 countries (United Nations database). The data resulted in the following scatterplot.     a.  Do you think there is a clear pattern? Describe the association between Internet usage and population. b.  Comment on.
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  Short Answer - Quiz A     A mid-sized company has decided to implement an enterprise resource planning (ERP) system and management suspects that many of its employees are concerned about the planned implementation. They are considering holding informational workshops to help decrease anxiety levels among employees. In order to determine whether such.
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  Short Answer - Quiz B     An operations manager was interested in determining if there is a relationship between the amount of training received by production line workers and the time it takes for them to trouble shoot a process problem. A sample of recently trained line workers was selected. The number.
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  Short Answer - Quiz B     An army depot that overhauls ground mobile radar systems is interested in improving its processes. One problem involves troubleshooting a particular component that has a high failure rate after it has been repaired and reinstalled in the system. The shop floor supervisor believes that having standard.
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  Short Answer - Quiz A     Consider the following to answer the question(s) below:   A land owner is considering a community development project. Even though he realizes that the current market for housing is not very favorable, he believes that there will be an influx of retirees into the area within the next.
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  Short Answer - Quiz B     A large software development firm recently relocated its facilities. Top management is interested in fostering good relations with their new local community and has encouraged their professional employees to engage in local service activities. They believe that the firm's professionals volunteer an average of more than.
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  Short Answer - Quiz A     Insurance companies track life expectancy information to assist in determining the cost of life insurance policies. Last year the average life expectancy of all policyholders was 77 years. ABI Insurance wants to determine if their clients now have a longer life expectancy, on average, so they.
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Short Answer - Quiz A     EU (European Union) countries report that 46% of their labour force is female. The United Nations wants to determine if the percentage of females in the Canadian labour force is the same. Representatives from Statscan plan to check a random sample of over 10,000 employment records.
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  5) What is the associated P-value?   6) State your conclusion using α = .05.   7) For more accurate cost determination, ABI Insurance wants to estimate the average life expectancy to within one year with 95% confidence. How many randomly selected recently paid policies would they need to sample?   8) Suppose ABI samples 100.
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  Top management of a large multinational corporation wants to create a culture of innovativeness and change. A consultant hired to assess the company's organizational culture finds that only 15% of employees are open to new ideas and approaches toward their work. One of his recommendations is for the company to.
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  1) Consumer Reports Health routinely compares drugs in terms of effectiveness and safety.  Suppose that in the summer 2010 they reviewed drugs used to treat arthritis.  Information was reported on convenience of use (how many pills required each day), possible side effects (e.g., dizziness, stomach upset), cost, and ratings of.
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  Short Answer - Quiz A   1) A large automobile parts supplier, keeps track of the demand for a particular part needed by its customers, automobile manufacturers. The time series plot below shows monthly demand for this part (in thousands) for a five year period. a.  Identify the dominant time series component (s).
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  Multiple Choice - Quiz C     Vending machines on a college campus offer a variety of drinks. The purchasing agent believes that each type of drink is equally preferred by students and consequently, orders equal quantities. The number of drinks sold from vending machines on this campus for the last six months.
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  Short Answer - Quiz B     One division of a large defense contractor manufactures telecommunication equipment for the military. This division reports that 12% of non-electrical components are reworked. Management wants to determine if this percentage is the same as the percentage rework for electrical components manufactured by the company. The Quality.
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  Multiple Choice - Quiz C     A mid-sized company has decided to implement an enterprise resource planning (ERP) system and management suspects that many of its employees are concerned about the planned implementation. They are considering holding informational workshops to help decrease anxiety levels among employees. In order to determine whether such.
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  Multiple Choice - Quiz C     In determining the best companies to work for, a number of variables are considered, including size, average annual pay, and turnover rate, etc. Moreover, employee surveys are conducted in order to assess aspects of the organization's culture, such as trust and openness to change. In an.
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  5) What is the associated P-value?   6) State your conclusion using α = .05.   7) For a more accurate determination, top management wants to estimate the average number of hours volunteered per month by their professional staff to within one hour with 99% confidence. How many randomly selected professional employees would they.
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  Short Answer - Quiz B     Suppose that a report indicates that 28% of Canadians have experienced difficulty in making mortgage payments. Further suppose that a news organization randomly sampled 400 Canadians from 10 cities and found that 136 reported such difficulty. Does this indicate that the problem is more severe among.
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Short Answer - Quiz A       A company manufacturing computer chips finds that 8% of all chips manufactured are defective. Management is concerned that high employee turnover is partially responsible for the high defect rate. In an effort to decrease the percentage of defective chips, management decides to provide additional training to.
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  Multiple Choice - Quiz C   1) A large automobile parts supplier keeps track of the demand for a particular part needed by its customers, automobile manufacturers. The time series plot below shows monthly demand for this part (in thousands) for a five-year period. The dominant component in this time series is     A).
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Short Answer - Quiz A   1) Management styles differ among organizations and may potentially affect employee's job satisfaction. A sample of employees was randomly selected from each of three companies with different management styles (Authoritarian, Laissez faire and Participative) and asked to rate their level of job satisfaction on a 10-point.
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  Multiple Choice - Quiz C   1) Monthly closing stock prices for a utility company were obtained from January 2007 through August 2008. A regression model was estimated to describe the trend in closing stock prices over time. What does the plot of residuals below suggest?     A) An outlier is present in the.
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  72.Exhibit 9-4. A school teacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 4pCi/L. The school samples the air for 36 days and finds an average concentration of 4.4pCi/L with a standard deviation of 1pCi/L.Refer to Exhibit 9-4..
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  62.Exhibit 9-3. The Boston public school district has had difficulty maintaining on-time bus service for its students ("A Year Later, School Buses Still Late," Boston Globe, October 5, 2011). Suppose the district develops a new bus schedule to help combat chronic lateness on a particularly woeful route. Historically, the bus.
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  Multiple Choice - Quiz C     A sales manager was interested in determining if there is a relationship between college GPA and sales performance among salespeople hired within the last year. A sample of recently hired salespeople was selected and the number of units each sold last month was recorded. Relevant data.
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  Multiple Choice - Quiz C   1) Which of the following is not an assumption or condition for the distribution of sample proportions? A) The independence assumption. B) The sample size assumption. C) The randomization condition. D) The 10% condition E) The large enough sample condition.   2) Which of the following is not an assumption or condition for.
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  A company that sells eco-friendly cleaning products is concerned that only 19.5% of people who use such products select their brand. A marketing director suggests that the company invest in new advertising and labeling to strengthen its green image. The company decides to so but in a test market so.
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  Multiple Choice -  Quiz C   1) Which of the following statements is false regarding nonparametric methods? A) Nonparametric methods are appropriate when we want to treat the data as ordinal. B) Compared to the correlation coefficient r, Spearman rho is less affected by outliers in the data. C) The Wilcoxon rank sum test is.
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  Multiple Choice - Quiz C     A company manufacturing computer chips finds that 8% of all chips manufactured are defective. Management is concerned that high employee turnover is partially responsible for the high defect rate. In an effort to decrease the percentage of defective chips, management decides to provide additional training to.
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