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Why would there be different published values for the normal range of a particular measurement?
Different people or organizations may have made slightly different measurements. Measurements are never 100% accurate.
What does a line graph in which the data points do not fall along a straight line mean?
There are several possible answers: The line is actually meant to be a curved line and not a straight line. The relationship between the two variables is not a linear function. Discovering this can be one of the main reasons for drawing the graph. The data points are empirical measurements (from an experiment, for example) and there are errors associated with the observations. The errors may be systematic or random. You have made mistakes - either in recording the data or in plotting them.
When is data considered invalid?
Data is considered invalid when it is wrong or has changed. Data represents facts that are recorded, so any alterations made to it can make it invalid.
What trend can you see in the graph you made from the data table about the distance traveled by a car?
That question can only be answered by the person who made the graph from the data table, referred to as "you" in the question. Get busy!
Explain the different stages of planning a statistical survey?
Stages of Planning a statistical survey 1. Nature of the problem to be investigated should be clearly defined in an un-ambigous manner. 2. Objectives of investigation should be stated at the outset. Objectives could be to obtain certain estimates or to establish a theory or to verify a existing statement to find relationship between characteristics etc. 3. The scope of investigation has to be made clear. It refers to area to be covered, identification of units to be studied, nature of characteristics to be observed, accuracy of measurements, analytical methods, time, cost and other resources required. 4. Whether to use data collected from primary or secondary source should be determined in advance. 5. The organization of investigation is the final step in the process. It encompasses the determination of number of investigators required their traning, supervision work needed, funds required.
