Which of the following statistical questions would best be answered by an observational study?(1 point)
Responses
What is the effect of different durations of sunlight exposure on a plant’s growth?
What is the effect of different durations of sunlight exposure on a plant’s growth?
Does the size of a football affect the distance a quarterback can accurately throw it?
Does the size of a football affect the distance a quarterback can accurately throw it?
What is the rate of growth of a certain animal species?
11 answers
What is the rate of growth of a certain animal species?
Which of the following is an example of selection bias?(1 point)
Responses
asking a random selection of pet store customers how much they spend on vet bills annually
asking a random selection of pet store customers how much they spend on vet bills annually
asking book store customers for volunteers to provide a review of a new book
asking book store customers for volunteers to provide a review of a new book
asking every fourth ticket holder about their experience at a basketball game
Responses
asking a random selection of pet store customers how much they spend on vet bills annually
asking a random selection of pet store customers how much they spend on vet bills annually
asking book store customers for volunteers to provide a review of a new book
asking book store customers for volunteers to provide a review of a new book
asking every fourth ticket holder about their experience at a basketball game
asking book store customers for volunteers to provide a review of a new book
Which of the following describes a statistical question that would best be answered by a survey?(1 point)
Responses
What percentage of Ivy League students consider transferring after their freshman year?
What percentage of Ivy League students consider transferring after their freshman year?
Does a new diet pill lead to weight loss?
Does a new diet pill lead to weight loss?
Which mosquito repellent lasts the longest?
Responses
What percentage of Ivy League students consider transferring after their freshman year?
What percentage of Ivy League students consider transferring after their freshman year?
Does a new diet pill lead to weight loss?
Does a new diet pill lead to weight loss?
Which mosquito repellent lasts the longest?
What percentage of Ivy League students consider transferring after their freshman year?
Chris is curious about how long different insects can live under extreme heat conditions. He decides to place insects in a heated oven and study how long it takes for them to stop moving. Would Chris’s statistical question best be answered by an observational study?(1 point)
Responses
No, an observational study would not be best because the study is not ethical.
No, an observational study would not be best because the study is not ethical.
Yes, an observational study would be best because Chris is applying a treatment to the sample.
Yes, an observational study would be best because Chris is applying a treatment to the sample.
No, an observational study would not be best because the sample is not representative of the overall population.
No, an observational study would not be best because the sample is not representative of the overall population.
Responses
No, an observational study would not be best because the study is not ethical.
No, an observational study would not be best because the study is not ethical.
Yes, an observational study would be best because Chris is applying a treatment to the sample.
Yes, an observational study would be best because Chris is applying a treatment to the sample.
No, an observational study would not be best because the sample is not representative of the overall population.
No, an observational study would not be best because the sample is not representative of the overall population.
No, an observational study would not be best because the study is not ethical.
The local library has 4,250 library card holders. The library sends out a survey to every fifth library card holder. If all of the surveyed participants respond, what percent of the total population has been surveyed?(1 point)
Responses
20%
20%
212.5%
212.5%
10%
Responses
20%
20%
212.5%
212.5%
10%
10%
A statistician develops a model to determine how many minutes it will take an individual to fall asleep given the number of hours they spent looking at a screen throughout the day. Using their model, y=7+2.6x
, how many minutes should it take to fall asleep for someone who watched a screen for five hours throughout the day?(1 point)
Responses
20 minutes
20 minutes
37.6 minutes
37.6 minutes
9.6 minutes
, how many minutes should it take to fall asleep for someone who watched a screen for five hours throughout the day?(1 point)
Responses
20 minutes
20 minutes
37.6 minutes
37.6 minutes
9.6 minutes
Using the model y = 7 + 2.6x, where x is the number of hours spent looking at a screen and y is the number of minutes it takes to fall asleep, the calculation for someone who watched a screen for five hours would be:
y = 7 + 2.6(5)
y = 7 + 13
y = 20
Therefore, it should take 20 minutes for someone who watched a screen for five hours to fall asleep.
So, the correct response is:
20 minutes
y = 7 + 2.6(5)
y = 7 + 13
y = 20
Therefore, it should take 20 minutes for someone who watched a screen for five hours to fall asleep.
So, the correct response is:
20 minutes