Determine whether the given description corresponds to an observational study or an experiment. In a study of 395 girls with a particular disease, the subjects were injected with vitamins to determine...

Extracted text: Determine whether the given description corresponds to an observational study or an experiment. In a study of 395 girls with a particular disease, the subjects were injected with vitamins to determine if the vitamins have an effect on the disease. Does the given description correspond to an observational study or an experiment? O A. The given description corresponds to an experiment. O B. The given description corresponds to an observational study. OC. The given description does not provide enough information to answer this question.


Extracted text: Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. Drive-thru Restaurant A Order Accurate Order Not Accurate 278 233 30 320 121 35 55 17 If two orders are selected, find the probability that they are both from Restaurant D. a. Assume that the selections are made with replacement. Are the events independent? b. Assume that the selections are made without replacement. Are the events independent? a. Assume that the selections are made with replacement. Are the events independent? The probability of getting two orders from Restaurant D is The events Do not round until the final answer. Round to four decimal places as needed.) V independent because choosing the first order V the probability of the choice of the second or b. Assume that the selections are made without replacement. Are the events independent? The probability of getting two orders from Restaurant D is. The events (Do not round until the final answer. Round to four decimal places as needed.) V independent because choosing the first order V the probability of the choice of the second or