VCU STAT 210 - Test 1 Practice Test #3(1) (3 pages)

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Test 1 Practice Test #3(1)



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Test 1 Practice Test #3(1)

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Pages:
3
School:
Virginia Commonwealth University
Course:
Stat 210 - Basic Practice of Statistics
Basic Practice of Statistics Documents
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Test 1 Practice Test 3 The Commonwealth of Virginia has a contract with Enterprise so that state employees can rent vehicles for official use at an agreed upon reduced rate Of interest is to gather information about all state employees in the Commonwealth of Virginia including whether they have ever rented a vehicle through Enterprise and if so their satisfaction with the rental and the types of vehicles rented It is known that in 2011 out of all state employees a total of 1645 employees rented vehicles for official use through the special contract with Enterprise To gather more information about all employees in the Commonwealth of Virginia a sample of 50 state employees was selected Nine of these 50 state employees had rented a vehicle for official use through Enterprise and 4 of the 9 employees who had rented a vehicle had received Toyota Corollas Of the 50 employees in the sample only 14 or 28 knew about the Commonwealth s contract with Enterprise and that with approval they could make use of the agreed upon reduced rate 1 The population of interest is described in the paragraph above State the population of interest A one sentence answer that begins with The population of interest is is sufficient 2 As indicated above 28 of the employees in the sample knew about the contract with Enterprise and that with approval they could make use of the reduced rate In this scenario is 28 an example of a parameter or a statistic A Parameter B Statistic 3 As indicated above in 2011 a total of 1645 state employees rented vehicles for official use through the contract with Enterprise In this scenario is 1645 an example of a parameter or a statistic A Parameter B Statistic 4 What type of characteristic is number of employees in a state agency that rented a vehicle through Enterprise for official use A Constant B Categorical variable C Discrete quantitative variable D Continuous quantitative variable 5 What type of characteristic is calculated satisfaction score for an employee who rented from Enterprise A Constant B Categorical variable C Discrete quantitative variable D Continuous quantitative variable 6 What type of characteristic is type of vehicle rented through Enterprise A Constant B Categorical variable C Discrete quantitative variable D Continuous quantitative variable To select the sample of 50 state employees on which additional information was gathered the following three methods were proposed For each of questions 7 8 and 9 identify the type of sampling procedure described 7 A postcard was mailed to all state employees and they were asked to call a number on the card if they wanted more information about the contract and were willing to participate in the study 50 state employees voluntarily called the number and information was collected only on these 50 state employees What type of sampling procedure is this an example of A Stratified random sampling B Volunteer response sampling C Simple random sampling D Multistage random sampling E Haphazard sampling 8 A list of all state employees in the Commonwealth of Virginia was created and each employee on the list was assigned a unique number Fifty numbers were randomly selected and each number was matched to an employee on the list These 50 state employees make up the sample What type of sampling procedure is this an example of A Stratified random sampling B Volunteer response sampling C Simple random sampling D Multistage random sampling E Haphazard sampling 9 10 Among the largest state agencies are state supported colleges and universities Suppose that when the sample of 50 state employees was selected all employees at state supported colleges and universities were excluded from consideration If the responses of employees at state supported colleges and universities are different from those of the 50 employees from other agencies that were chosen for the sample what type of bias could this cause A Confounding bias B Nonresponse bias C Response bias D Selection bias 11 Suppose the sample as described in question 8 was selected but with the following modification Actually 100 employees were randomly selected and contacted but only 50 of them responded and answered the questions If the characteristics of those who did respond and those who did not respond are different what type of bias would this create A Confounding bias B Nonresponse bias C Response bias D Selection bias 12 Enterprise is interested in conducting a study to determine if a state employee s satisfaction with the rental vehicle is affected by whether the vehicle is manufactured by a company based in the United States or if it is produced by a foreign company Each of the 50 employees participating in the study was randomly assigned to drive either a vehicle produced by a company based in the United States or one produced by a foreign company When the vehicle was returned they completed the satisfaction survey and the satisfaction score was calculated In this scenario which of the following is the treatment of interest A The agency the employee works for B The number of days the employee rented the vehicle C Whether the vehicle was produced by a company based in the United States or produced by a foreign company D The calculated satisfaction score 13 Consider the information provided in question 12 In this scenario which of the following is the response variable A The agency the employee works for B The number of days the employee rented the vehicle C Whether the vehicle was produced by a company based in the United States or produced by a foreign company D The calculated satisfaction score 14 Consider the information provided in question 12 As described is this an example of a controlled experiment or an observational study A Controlled experiment B Observational study 15 There are many state agencies in the Commonwealth of Virginia A random sample of five of these state agencies was selected and then from each of these five state agencies ten state employees were selected This produced the sample of 50 state employees What type of sampling procedure is this an example of A Stratified random sampling B Volunteer response sampling C Simple random sampling D Multistage random sampling E Haphazard sampling As mentioned prior to question 1 1645 state employees rented Enterprise vehicles for official use in 2011 Your job is now to select a simple random sample of five 5 of these 1645 employees Assuming that you could be provided with a list of the names of the 1645


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