Types of T-Test and Effect Size
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In a t-test, what is the purpose of comparing the means of two groups?

  • To determine if the variance of the two groups is equal
  • To find out if the two groups have the same standard deviation
  • To investigate whether a process or treatment has an effect on the population of interest (correct)
  • To determine if the two groups have the same sample size

    • What is the null hypothesis in the context of the anxiety level example given?

  • There is a significant difference in anxiety levels between Group A and Group B
  • The anxiety levels of Group A and Group B are different
  • The anxiety levels of Group A and Group B are equal
  • There is no significant difference in anxiety levels between Group A and Group B (correct)

    • What does a p-value of 0.02 indicate in the context of the t-test?

  • The null hypothesis is proven to be true
  • The significance level should be increased to 0.10
  • The null hypothesis can be rejected at a significance level of 0.05 (correct)
  • The null hypothesis cannot be rejected at a significance level of 0.05

    • What is the alternative hypothesis regarding anxiety levels in the given example?

    <p>There is a significant difference in anxiety levels between Group A and Group B</p> Signup and view all the answers

    What is the significance of comparing the obtained p-value with the chosen alpha level?

    <p>To assess whether the result is statistically significant</p> Signup and view all the answers

    What is the purpose of ANOVA?

    <p>To determine differences between research results from three or more unrelated samples or groups</p> Signup and view all the answers

    When would you use one-way ANOVA?

    <p>When examining the relationship between an independent variable and one quantitative dependent variable</p> Signup and view all the answers

    What type of variables do discrete variables represent?

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

    In ANOVA, what is considered a quantitative dependent variable?

    <p>Customer satisfaction ratings</p> Signup and view all the answers

    What is the most basic form of ANOVA?

    <p>One-way ANOVA</p> Signup and view all the answers

    In the context of simple random sampling, what does it mean for the selection of one member to be independent of every other member?

    <p>Picking one member does not affect the probability of picking any other member.</p> Signup and view all the answers

    What is the characteristic of a simple random sampling strategy?

    <p>Each member of the population has an equal chance of being selected into the sample.</p> Signup and view all the answers

    In the given example, what is important for the researcher to consider when making statistical generalizations?

    <p>The National Twin Registry may not be representative of all twins.</p> Signup and view all the answers

    What is the most straightforward sampling strategy mentioned in the text?

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

    What does simple random sampling require in terms of picking members from the population?

    <p>Pure chance</p> Signup and view all the answers

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