Sampling and Descriptive Statistics Quiz
31 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the formula for the range of a distribution?

  • Highest value - Lowest value (correct)
  • Average distance between each score and the mean
  • Difference between two percentiles
  • Standard deviation / Mean
  • Which measure of spread is sensitive to extreme values?

  • Percentile
  • Range
  • Mode
  • Standard deviation (correct)
  • In the formula for standard deviation, what does 'N' represent?

  • Difference between two percentiles
  • Sum of scores
  • Average distance between each score and the mean
  • Number of scores (correct)
  • What does a z-score of 0 indicate in a normal distribution?

    <p>The score is equal to the mean</p> Signup and view all the answers

    What does a correlation coefficient of -0.85 indicate about the relationship between two variables?

    <p>Strong negative relationship</p> Signup and view all the answers

    In multiple regression, what does R^2 represent?

    <p>The amount of shared variance between independent variables</p> Signup and view all the answers

    What does a scattergram plot in relation to two variables?

    <p>The strength and direction of the relationship</p> Signup and view all the answers

    Who were the individuals involved in the correspondence on fair division of the stake in an interrupted game of chance?

    <p>Gerolamo Cardano, Pierre de Fermat, and Blaise Pascal</p> Signup and view all the answers

    What is the formula for probability in terms of frequency?

    <p>$Probability = \frac{Frequency}{Total Frequency}$</p> Signup and view all the answers

    What type of distribution is the normal (Gaussian) distribution?

    <p>Continuous probability distribution</p> Signup and view all the answers

    What is the normal (Gaussian) distribution also known as?

    <p>The bell curve</p> Signup and view all the answers

    What does the area under the normal distribution represent?

    <p>100% (or $p = 1$)</p> Signup and view all the answers

    Who ordered the French troops to spare Gottingen because 'the greatest mathematician of all times is living there'?

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

    Which sampling technique involves dividing the population into subgroups and then taking a random sample from each subgroup?

    <p>Stratified random sampling</p> Signup and view all the answers

    What influences sample sizes?

    <p>Population size, accuracy required, variability of the population, and the number of variables to be examined</p> Signup and view all the answers

    Which type of sampling is often used due to practical limitations and ethical considerations?

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

    What do descriptive statistics help manage and interpret?

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

    What are key descriptors for frequency distributions?

    <p>Measures of central tendency</p> Signup and view all the answers

    What type of statistics are used to draw inferences from samples to populations?

    <p>Inferential statistics</p> Signup and view all the answers

    What does random (probability) sampling provide the best representation of?

    <p>The population</p> Signup and view all the answers

    What can lead to inaccuracies in generalizing findings from a sample to a population?

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

    What can increasing the sample size do in terms of representing the population?

    <p>Increase its fidelity to represent the population</p> Signup and view all the answers

    What does random sampling not guarantee about the sample?

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

    What do repeated random samplings yield closer approximations to?

    <p>The mean</p> Signup and view all the answers

    What does the mean of the normal distribution approximate with more independent scores?

    <p>The true mean</p> Signup and view all the answers

    What is the best way to ensure a sample represents a population?

    <p>Conducting random (probability) sampling</p> Signup and view all the answers

    How does increasing the sample size affect its representation of the population?

    <p>It increases fidelity to represent the population</p> Signup and view all the answers

    What is the impact of sampling bias on generalizing findings?

    <p>It can lead to inaccuracies in generalizing findings</p> Signup and view all the answers

    What happens to the mean of a normal distribution with more independent scores?

    <p>It approximates the true mean more closely</p> Signup and view all the answers

    What is the effect of repeated random samplings on approximations to the mean?

    <p>They yield closer approximations to the mean</p> Signup and view all the answers

    How are outliers in the data determined in relation to the mean and standard deviation?

    <p>By the number of standard deviations from the mean</p> Signup and view all the answers

    Study Notes

    Understanding Sampling and the Wisdom of Crowds

    • The normal distribution is divided by the mean and standard deviation
    • Independent scores often tend towards a normal distribution
    • The mean of the normal distribution approximates the true mean with more independent scores
    • An ad hoc in-class experiment with 33 independent estimates was conducted
    • The data were coded from paper to spreadsheet on a "first come first served" basis
    • There were outliers in the data, as determined by the number of standard deviations from the mean
    • Sampling is done to represent the population and generalize findings
    • Sampling bias can lead to inaccuracies in generalizing findings
    • Random (probability) sampling provides the best representation of a population
    • Increasing the sample size increases its fidelity to represent the population
    • Random sampling does not guarantee that the sample will be representative
    • Repeated random samplings yield closer approximations to the mean

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    3001-5.pptx

    Description

    Test your knowledge of sampling and descriptive statistics with this quiz. Explore confidence intervals, different sampling techniques, sample sizes, inferential statistics, non-probability sampling methods, and descriptive statistics. Understand the importance of sample size and the impact of sampling bias on generalizing findings.

    More Like This

    Sampling Methods Quiz
    6 questions
    Statistical Concepts and Sampling Methods
    53 questions
    Sampling Methods Quiz
    13 questions

    Sampling Methods Quiz

    ImpartialAlbuquerque avatar
    ImpartialAlbuquerque
    Psychology Sampling Methods Flashcards
    24 questions
    Use Quizgecko on...
    Browser
    Browser