Comprehensive Exam Practice for “MATH 225N” Students

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1. Q & A: Of the following pairs of events, which pair has mutually exclusive events? 2. Q & A: Hugo averages 41 words per minute on a typing test with a standard deviation of 7.5 words per minute... . Suppose Hugo's words per minute on a typing test are normally distributed. Let X= the number of words per minute on a typing test. Then, X∼N(41,7.5). Suppose Hugo types 45 words per minute in a typing test on Wednesday. The z-score when x=45 is . This z-score tells you that x=45 is standard deviations to the (right/left) of the mean, . Correctly fill in the blanks in the statement above. Select the correct answer below: 3. Q & A: A fitness center claims that the mean amount of time that a person spends at the gym per visit is 33 minutes. Identify the null hypothesis, H0, and the alternative hypothesis, Ha, in terms of the parameter μ. 4. Q & A: A recent study suggested that 81% of senior citizens take at least one prescription medication. Amelia is a nurse at a large hospital who would like to know whether the percentage is the same for senior citizen patients who go to her hospital. She randomly selects 59 senior citizens patients who were treated at the hospital and finds that 49 of them take at least one prescription medication. What are the null and alternative hypotheses for this hypothesis test ? 5. Q & A: A doctor notes her patient's temperature in degrees Fahrenheit every hour to make sure the patient does not get a fever. What is the level of measurement of the data. [Show More]

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