Hypothesis Testing for Average Age of Heart Disease Patients
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Questions and Answers

In the first scenario, what is the null hypothesis (H0) for the test?

  • χ̅ ≤ 50
  • µ > 50
  • µ = 50 (correct)
  • χ̅ = 50
  • What is the decision rule for rejecting the null hypothesis in the first scenario?

  • Reject H0 if Z ≥ 1.96
  • Reject H0 if Z ≥ 1.64 (correct)
  • Reject H0 if Z ≤ 1.64
  • Reject H0 if Z ≤ 1.96
  • In the second scenario, what is the alternative hypothesis (H1) for the test?

  • p > 0.75 (correct)
  • p ≤ 0.75
  • p = 0.75
  • p < 0.75
  • What is the sample proportion (p) in the second scenario?

    <p>0.80</p> Signup and view all the answers

    What is the calculated Z value in the second scenario?

    <p>3.57</p> Signup and view all the answers

    What does rejecting the null hypothesis at alpha = 0.05 indicate in both scenarios?

    <p>The average age is greater than 50.</p> Signup and view all the answers

    In a hypothesis test H0: p=0.55 versus H1: p< 0.55 where p is a population proportion, what is the value of the test statistics closest to?

    <p>-4.45</p> Signup and view all the answers

    The distribution is negatively skewed if the arithmetic mean is:

    <p>Less than the median</p> Signup and view all the answers

    What type of graphical presentation is most common for discrete data?

    <p>Bar chart, frequency polygon</p> Signup and view all the answers

    What measure of central tendency cannot be used with skewed data?

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

    The value set for α is known as:

    <p>The significance level</p> Signup and view all the answers

    Which hypothesis is the analyst trying to prove in a hypothesis test?

    <p>Alternative hypothesis</p> Signup and view all the answers

    What type of t-test will be used to compare the number of hours of sleep after taking a placebo and after taking a pill claiming to be better than a placebo for 50 patients?

    <p>A paired sample t-test</p> Signup and view all the answers

    If a calculated t value is less than the tabulated t value, what decision would be made in the hypothesis test?

    <p>Accept the null hypothesis</p> Signup and view all the answers

    25

    <p>The significance level</p> Signup and view all the answers

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