EXAM 4 PRACTICE PROBLEMS (1).pdf - IMPORTANT(PLEASE READ(1 This is NOT a sample exam(may be similar or not(2 I made this practice problems solely by

# EXAM 4 PRACTICE PROBLEMS (1).pdf - IMPORTANT(PLEASE READ(1...

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IMPORTANT (PLEASE READ): (1) This is NOT a sample exam (may be similar or not). (2) I made this practice problems solely by myself. * [ ] = possible choices . You will have choices on the exam, so don’t stress out if you did not get the exact words for fill in the blank questions. Example 1 A doctor claims that the average recovery time from knee surgery is 5 months. Believing that the average recovery time is actually longer than 5 months, we gather a sample of n=44 knee surgery patients and find that their average recovery time is 5.2 months. The correct null and alternative hypothesis would be: H: H: Assuming the relevant p-value is 0.035, complete the conclusion below: We ________ the null hypothesis. We _______ [have, don’t have] evidence that the average recovery time of knee surgery patients is greater than 5 months. Example 2 A hospital is interested in knowing whether there is a difference in proportions of males and females who regularly visit the doctor. A survey is sent out to 150 randomly chosen U.S. adults, asking the person’s biological gender and whether they regularly visit the doctor or not. Let males be group 1 and females as group 2, the difference in proportions between the two groups who regularly visit the doctor is -0.13. The correct null and alternative hypothesis would be: H: H: Assuming the relevant p-value is 0.043, complete the conclusion below: Example 3 Assuming we are testing the following hypotheses: H: pp= 0 H: pp≠ 0Our test statistic is = 0.05 Which of the following could represent the correct randomization distribution and p-value calculation for this situation? B D Example 4 Assuming we are testing the following hypotheses: H: = 0 H: ρ ≠ 0The figure below is a randomization distribution with 3000 samples and clicked “twotailed” option, without changing any other settings.Based on this output, our sample statistic is __ = _______. (ex. = 0.6)The p-value is __________. -  • • • 