Math 120 Practice Exam Chapter 1 – Flashcards
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statistic
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In a poll of a 12,000 adults in a certain city, 12% said they left for work before 6 am
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statistic
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in a national survey of high school students, 25% if respondent reported that someone had offered, sold, or given them an illegal drug on school property.
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parameter
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Following the election, 18% of the governors of all 50 states were female
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Qualitative
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address
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Quantitative
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gallon of water in a swimming pool
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quantitative
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Amount of money won in a lottery
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discrete
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numbers of cars owned
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continuous
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Amount of rainfall in a city in one year
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discrete
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Number of days of rainfall in one year
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What is the population in this study?
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The Gallup Organization contacts 2542 undergraduates who attend a college and live outside the U.S. and asks whether or not they had taken a course in conversational English during their studies. A. All undergraduates students who attend the college and live outside the U.S.
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What is the sample in this study?
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The Gallup Organization contacts 2542 undergraduates who attend a college and live outside the U.S. and asks whether or not they had taken a course in conversational English during their studies. A. The 2542 undergraduates who attend college and live outside the U.S.
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Experiment
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50 patients with colon cancer are divided into two groups. One group recieves an experimental drug to fight cancer, the other gets a placebo. After one year the spread of cancer is measured.
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Observational study
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While shopping, 275 people are asked to perform a taste test in which they eat two placed, unmarked soups. They are asked which soup they prefer.
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What is the responce variable?
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Researchers wanted to determine if there was an asscosiation between daily coffee consumption and the occurance of skin cancer. The researchers looked at 94,383 woman and asked them to report nonmelanoma skin cancer. After their analysis, the researchers, concluded that consumption of six or more cups caffinated per day was associated in nonmelnoma skin cancer. A. nonmelanoma skin cancer
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What is explanatory variable in this study?
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Researchers wanted to determine if there was an asscosiation between daily coffee consumption and the occurance of skin cancer. The researchers looked at 94,383 woman and asked them to report nonmelanoma skin cancer. After their analysis, the researchers, concluded that consumption of six or more cups caffinated per day was associated in nonmelnoma skin cancer. A. daily coffee consumption
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Can the researchers say that the consumption of six or more cups of caffinated coffee per day will cause a reduction in nonmelanoma skin cancer?
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Researchers wanted to determine if there was an asscosiation between daily coffee consumption and the occurance of skin cancer. The researchers looked at 94,383 woman and asked them to report nonmelanoma skin cancer. After their analysis, the researchers, concluded that consumption of six or more cups caffinated per day was associated in nonmelnoma skin cancer. A. No, this is an observational we cannot claim causation only association
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Determine the sample of the 5 faculty members
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A small community college employs 58 full time faculty members. To gain faculty opinions about upcoming contract negotiations, the president of the faculty union wishes to obtain a simple random sample that will consist of 5 faculty measures. Using the table start with row 19,column A. 12, 39,29,9,58
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Systematic Sampling
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To estimate the percentage of defects in the a recent manufacturing branch, a quality control manager at GE selects every 15th refrigerator that comes off the assembly linestarting with the second until she obtains a sample of 100 refridgerator.
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Cluster
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To determine customer opinion of their safty features, Toyata randomly selcts 30 dealerships during a certain week and surveys all customers visiting the dealership.
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Convinence
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A newspaper asks its readers to call in their opinion regarding the number of books they have read this month.
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Stratified
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Thirty-five sophmores, 23 juniors and 38 seniors are randomly selected to participate in a study from 574 sophmores, 543 juniors, and 542 seniors.
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simple random
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Ford wants to administer a satisfaction survey to its current customers. Using their customer database, the company randomly selects 40 customers and asks them about their level of satisfaction with the company.
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Sampling Bias
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The owner of a shopping mall wishes to expand