# Variables and Distributions

**Tutor description**

1) Determine whether the evaluated group is a population or a sample a) Based on a randomly selected group of 500 patients with high cholesterol, it was found that 67% have heart disease. Is this a population or a sample; explain your answer. b) An investigation of 150 randomly selected local restaurants concluded that 42% of local restaurants have serious health code violations. Is this a population or a sample; explain your answer. 2) Determine whether the given value is a statistic or a parameter. a) A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer. b) After taking the first exam, 15 of the students dropped the class. Is this a statistic or a parameter; explain your answer. 3) Identify the type of sampling used. a) A tax auditor selects every 1000th income tax return that is received. What type of sample is this and why? b) The name of each contestant is written on a separate card, an

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