A researcher wonders whether speed of service at a diner is affected by whether a male customer is wearing a suit jacket. The researcher used the following study design to collect data: The researcher chose five diners in a large city and recorded the number of male customers who wore a suit jacket during a two week period. He also records how long it took a waiter or waitress to address the customer. He finds that male customers who wear suit jackets were addressed by the wait staff faster than male customers who did not wear a suit jacket.
Choose the statement that correctly explains why we can or cannot generalize these results to a larger population.
◦ The male customers (and diners) were not selected from a larger population, so the results cannot be generalized beyond the sample.
◦ The male customers were randomly selected to participate in the study so the results can be generalized to the larger population.
◦ This was an observational study so results can be generalized to a larger population.
◦ The male customers were randomly assigned to wear a suit jacket so the results cannot be generalized to beyond the sample.
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