8b_More_Hypothesis_Testing_Outline_Slides

8b_More_Hypothesis_Testing_Outline_Slides - You should know...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
More About Hypothesis Testing You should know . . . • Significance 4 possible outcomes Type I and Type II error Alpha; Beta; Power Effect and distributions – when H 0 is false – when H 0 is true – calculating effect size More about z tests — assumptions Statistical Significance When the difference between means is large enough for us to reject the null hypothesis ( H 0 ), we say that the difference is “significant” Decisions vs. Reality The decision made in a hypothesis test is based on probability — it may be wrong If we compare reality with the decision that we make, we logically have 4 possible outcomes...
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Possible Outcomes • 1. Correct rejection of H 0 the difference is real; you rejected H 0 , and you should have • 2. Incorrect rejection of H 0 Type I error your test pointed you to a significant difference, but it was just a result of sampling error (that is, chance) 4 Possible Outcomes • 3. Correctly retain H 0 there isn’t really a difference (perhaps the treatment did nothing), and the test pointed to that assessment • 4. Incorrectly retain H 0 Type II error there actually is a difference, but sampling error related to the other population (e.g., Facebook users) caused a failure to detect it 4 possible outcomes of a hypothesis test Status of H 0 True H 0 False H 0 Decision: Retain H 0 Correct Decision Type II Error Reject H 0 Type I Error Decision matches reality 4 possible outcomes of a hypothesis test Status of H 0 True H 0 False H 0 Decision: Retain H 0 Correct Decision Type II Error Reject H 0 Correct Rejection “False Alarm” Decision does not match reality
Image of page 2
4 possible outcomes of a hypothesis test Status of H 0 True H 0 False H 0 Decision: Retain H 0 Type II Error Reject H 0 Type I
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern