A study was conducted to determine which school meal ought to be removed from the weekly rotation. Every student in the school was asked to rank their top three school lunches. Tuna melts were found to be the least-favored option, with only 7.8 percent of students ranking tuna melts in their top three choices. Which of the following accurately differentiates whether this is an example of an observational study, an experimental study, or a survey?(1 point)
Responses
This is a survey since opinions were collected.
This is a survey since opinions were collected.
This is an experimental study since a cause-and-effect relationship can be inferred.
This is an experimental study since a cause-and-effect relationship can be inferred.
This is an experimental study since a treatment was applied to the test subjects.
This is an experimental study since a treatment was applied to the test subjects.
This is an observational study since it included random sampling.
This is a survey since opinions were collected.
A researcher is interested in finding out which multivitamins are most widely used by Americans. He randomly samples 3,188 individuals, collecting and recording information about their multivitamin use. Which of the following accurately identifies the study design used here?(1 point)
Responses
survey
survey
There is insufficient information to answer the question.
There is insufficient information to answer the question.
experimental study
experimental study
observational study
observational study
Suppose it is known that approximately 7 percent of adults who take a certain medication will experience side effects. Which of the following simulations could model the number of individuals who will experience side effects if the medication is given to 390 adults?(1 point)
Responses
a number cube simulation with a six-sided number cube, where rolling a 3 indicates that side effects will be present
a number cube simulation with a six-sided number cube, where rolling a 3 indicates that side effects will be present
a spinner simulation with 14 equally spaced sections, with section 2 indicating that side effects will be present
a spinner simulation with 14 equally spaced sections, with section 2 indicating that side effects will be present
a random number chart simulation with 100 numbers, where drawing a 23 indicates that side effects will be present
a random number chart simulation with 100 numbers, where drawing a 23 indicates that side effects will be present
a coin simulation, with heads indicating that side effects will be present
a random number chart simulation with 100 numbers, where drawing a 23 indicates that side effects will be present
When should you make adjustments to a model?(1 point)
Responses
before requesting feedback from peers
before requesting feedback from peers
after study data suggests that it is inaccurate
after study data suggests that it is inaccurate
before running the study
before running the study
after making the necessary predictions needed from the model
after study data suggests that it is inaccurate
A model is built to predict the amount of rainfall that will occur in the city of Brayville, based on the average daily rainfall for the corresponding month of the prior year. Which of the following is an example of an outlier in the set of data?(1 point)
Responses
a lower-than-average number of people driving on the road due to wet conditions
a lower-than-average number of people driving on the road due to wet conditions
a higher-than-average rainfall due to an unseasonable hurricane that month
a higher-than-average rainfall due to an unseasonable hurricane that month
a higher-than-average soil moisture level at the Brayville city park
a higher-than-average soil moisture level at the Brayville city park
a higher-than-average number of people observing the rainfall totals that month