Exam 1: Describing Data: Graphical

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Errors which arise even if the entire population is used are called nonsampling errors.

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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The time (in hours)that a sample of 20 students studied for a statistics test are shown below THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The time (in hours)that a sample of 20 students studied for a statistics test are shown below    -Construct a cumulative frequency,cumulative relative frequency and cumulative percent distributions of the data. -Construct a cumulative frequency,cumulative relative frequency and cumulative percent distributions of the data.

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Which of the following statements involve inferential statistics as opposed to descriptive statistics?

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What percentage of the students in the sample went partying the weekend before the final exam and did well in the exam?

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A time-series plot measures time along the vertical axis and the numerical values of the variable of interest along the horizontal axis.

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Sampling error results from the fact that information is available on only a subset of all the population members.

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There are four levels of measurement within qualitative and quantitative data.

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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: At New York State University,800 students are randomly selected and asked the distance of their commute to campus.From this group a mean of 14.6 miles is computed. -What is the variable of interest?

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What is the correct ranking of data from weakest or lowest level to strongest or highest level?

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Find the percentage for "chip" defect items.

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In completing a survey,respondents use the following code numbers to indicate marital status: 1 = Single (never married), 2 = Married, 3 = Divorced, 4 = WidowedIs this data qualitative or quantitative? Explain.

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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Suppose you own a DVD rental store. -Give an example of a question concerning a possible relationship between two variables of interest to your DVD business.

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Convert the data to overall percentages.What patterns do you see in this table?

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Decisions are often based on incomplete information in an uncertain environment.

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We can describe graphically the shape of a distribution by a:

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If the sample is a good representation of the population,what percentage of the students in the population should we expect to spend the weekend studying and do poorly on the final exam?

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Which of the following is most likely a continuous numerical variable?

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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A paper company is interested in estimating the proportion of trees in a 600-acre forest with diameters exceeding 2 feet.The company selects 30 plots (100 feet by 100 feet)from the forest and utilizes the information from the 30 plots to help estimate the proportion for the whole forest. -What statistical term describes the 600-acre forest?

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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: An office supply warehouse has boxes of pencils,100 pencils to the box.Information about the entire warehouse as well as a sample of the boxes is shown below: THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: An office supply warehouse has boxes of pencils,100 pencils to the box.Information about the entire warehouse as well as a sample of the boxes is shown below:    -What is the population size? -What is the population size?

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One important principle that must be followed in the sample selection process is randomness.

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