PSYC123 Workbook 2019 - STUDENT V2 (Repaired).docx

# Conduct the appropriate hypothesis test using an

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Conduct the appropriate hypothesis test using an alpha of .05 Show all working, attach sheets if you run out of space, and follow the layout given in your tutorial. Data collected: 6 5 7 4 6 8 3 0 6 7 1. Analyse the question and extract all relevant information 2. Determine the test type required and whether the assumptions are met for that test 3. State the Hypotheses 57

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Workbook 2019: Answers V2 4. Set a Decision Rule 5. Conduct the statistical test, using: SS = Σx 2 ( Σx ) 2 N ^ s 2 = SS N 1 ^ s = ^ s 2 ^ s ´ X = ^ s N t = ( ´ X μ ) ^ s ´ X 58
Workbook 2019: Answers V2 6. Make a decision and conclusion 59

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Workbook 2019: Answers V2 10. You are investigating if academics have lower or higher stress levels than the general population. The population mean for stress levels is 13 (Fake & Citation, 2013) on the Fake Stress Levels Scale (Fake, 2005). You take a random sample of 12 academics and administer the Fake Stress Levels Scale (Fake, 2005). The resulting data is below. Conduct the appropriate hypothesis test using an alpha of .05 Show all working, attach sheets if you run out of space, and follow the layout given in your tutorial. Data 15 18 13 12 16 14 16 17 13 15 14 14 1. 2. 3. 4. 60
Workbook 2019: Answers V2 5. 61

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Workbook 2019: Answers V2 6. 62
Workbook 2019: Answers V2 Week 10: Chi-squared Practice questions (answer before tutorial). Read Chapter 15 (pages 472 -484) J&B and Chapter 15 in GH (may also help). Methods: 1. What is the chi-squared test and what values may it take? 2. When would we use a chi-squared test and (of the 4 data types described in Week 2) what data type would it best analyse? 3. What are the assumptions of the chi-squared test? 4. Does the sample size (N) impact the chi-squared value required for a particular significance? Explain. Calculations: 63 NB: Due to the public holiday on Monday 7 th October there will be no tutorials in week 10. However, students are still expected to complete the exercises and answers in the workbook for Chi-squared and do the workbook quiz in the week 11 tutorial. The workbook quiz from week 9 will be made available to students online. It will be open from Midnight Monday 7 th October to Midnight Sunday 13 th October.

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Workbook 2019: Answers V2 5. What is the formula for the chi-squared test? What is the formula for the expected frequency term? 6. What is the formula for determining the degrees of freedom relevant to this test? 64
Workbook 2019: Answers V2 WEEK 10: Chi-squared Practice questions (answer after tutorial). Read Chapter 15 (pages 472 -484) J&B and Chapter 15 in GH . Q.1. You are researching differences in colour preferences between different generations of people. According to the research Baby Boomers (born between 1946 and 1964) had a preference for the colour red over blue. You hypothesise that Y Gen people (born between 1980 and 1994) might have different tastes. You select a random sample of 100 baby boomers and 100 Y Gen people to test this. In your analysis you will use an alpha level of 0.05.

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