Statistics Sampling Methods and Forecasting
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Questions and Answers

Which sampling method involves selecting members based on convenience rather than random selection?

  • Convenience Sampling (correct)
  • Judgment Sampling
  • Snowball Sampling
  • Quota Sampling
  • In which sampling method does each member of the population have an equal and known chance of being selected?

  • Judgment Sampling
  • Quota Sampling
  • Stratified Random Sampling
  • Simple Random Sampling (correct)
  • What is a characteristic of stratified random sampling?

  • It always results in a biased sample.
  • Population is divided into subgroups before sampling. (correct)
  • Members are selected based on convenience.
  • It requires complex mathematical software for selection.
  • Which sampling approach is likely to produce more purposeful and less costly surveys?

    <p>Multiphase Sampling</p> Signup and view all the answers

    Which of the following sampling methods is characterized by using existing networks to recruit participants?

    <p>Snowball Sampling</p> Signup and view all the answers

    What is the focus of qualitative forecasting models?

    <p>Subjective judgments made by the forecaster</p> Signup and view all the answers

    Which characteristic is true regarding forecasting accuracy?

    <p>Aggregated data tends to provide more accurate forecasts than individual items</p> Signup and view all the answers

    What is a step in the forecasting process?

    <p>Monitoring forecast accuracy over time</p> Signup and view all the answers

    Which of the following is NOT a type of data in statistics?

    <p>Temporal</p> Signup and view all the answers

    The Naïve Forecasting method predicts that the next period's forecast will be based on what?

    <p>The last period's actual data</p> Signup and view all the answers

    What does 'Composition of Time Series Data' include according to forecasting?

    <p>A combination of historic pattern and random variation</p> Signup and view all the answers

    Which is an example of a quantitative forecasting technique?

    <p>Trend analysis over multiple years</p> Signup and view all the answers

    In statistical measures, which term indicates the average of a set of values?

    <p>Mean</p> Signup and view all the answers

    What is the effect of using a smaller N in moving averages?

    <p>Makes the forecast more responsive</p> Signup and view all the answers

    What is the formula for the Mean Absolute Deviation (MAD)?

    <p>MAD = sum of absolute errors / total periods</p> Signup and view all the answers

    Which of the following best describes a tracking signal?

    <p>Exposes bias in forecasting errors</p> Signup and view all the answers

    In weighted moving averages, what must the sum of the weights equal?

    <p>1</p> Signup and view all the answers

    What is the primary purpose of using sampling techniques?

    <p>To make inferences about a population</p> Signup and view all the answers

    What type of sample has a known non-zero probability of selection for each member?

    <p>Probability Samples</p> Signup and view all the answers

    What does a larger value of N in moving averages typically do?

    <p>Stabilizes the forecast</p> Signup and view all the answers

    Which method is NOT a type of probability sampling?

    <p>Judgmental sampling</p> Signup and view all the answers

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