Sophia Milestone 1 Practice Questions And
Answers With Latest Updates
,25/29 that's 86%
RETAKE THIS PRACTICE MILESTONE
25 questions were answered correctly.
4 questions were answered incorrectly.
1 Blinding
Which of these statements is true about a blind experiment?
• Closely matched elements are paired and then treatments are allotted to them.
• The total population is divided into homogeneous blocks.
• The total population is divided roughly into some groups and then some of the groups
are randomly selected.
• Some people involved are prevented from knowing certain information that might lead
to biased results.
RATIONALE
Blinding helps to prevent members of a study know key information in order to
prevent them from behaving or responding in a fashion that would be biased if they
knew if they were in a treatment or control group. For example, if you knew you were
in a treatment group, you might be more inclined to say it is working or give responses
that indicate that it is.
2 Discrete vs. Continuous Data
Which of the following data types will be continuous?
• Number of skyscrapers in a city
• Number of cars produced by a car company in a year
• Number of correct answers on a ten-question true/false test
Weight of a baby whale
, RATIONALE
For data to be continuous, it means it can take on any value inside of an interval. Since
the weight of a baby whale can take on any numerical value inside of possible ranges of
weights, it is continuous.
3 Margin of Error
A poll was conducted two weeks before an election and showed that the incumbent
would win with 56% of the vote and a margin of error of 4%.
If the incumbent needs to receive at least half the votes to win the election, can there be
confidence in the incumbent’s victory?
• Yes, because the lowest the incumbent could receive is 52% of the vote.
• Yes, because the poll stated that the incumbent will win with 60% of the vote.
• No, because she could receive as low as 4% of the vote.
• None of the above
RATIONALE
Recall for a confidence interval, we take the point estimate +/- margin of error. Using this
framework we take the point estimate of 56%, then add and subtract the margin of
error, 4%.
This gives us a CI of 52% to 56%.
Since the lower value is greater than 50%, we are confident that the incumbent should
earn at last 50% of the votes and win the election.
4 Placebo
Max conducted a clinical trial for a new vitamin supplement. He had two groups in his
clinical trial. The control group was given a sugar pill, and the treatment group was given
the new vitamin supplement. However, many of the participants in the control group
reported improvements in their general health, similar to the treatment group.
The ________ may describe the reason some participants from the control group
reported health improvements.
Answers With Latest Updates
,25/29 that's 86%
RETAKE THIS PRACTICE MILESTONE
25 questions were answered correctly.
4 questions were answered incorrectly.
1 Blinding
Which of these statements is true about a blind experiment?
• Closely matched elements are paired and then treatments are allotted to them.
• The total population is divided into homogeneous blocks.
• The total population is divided roughly into some groups and then some of the groups
are randomly selected.
• Some people involved are prevented from knowing certain information that might lead
to biased results.
RATIONALE
Blinding helps to prevent members of a study know key information in order to
prevent them from behaving or responding in a fashion that would be biased if they
knew if they were in a treatment or control group. For example, if you knew you were
in a treatment group, you might be more inclined to say it is working or give responses
that indicate that it is.
2 Discrete vs. Continuous Data
Which of the following data types will be continuous?
• Number of skyscrapers in a city
• Number of cars produced by a car company in a year
• Number of correct answers on a ten-question true/false test
Weight of a baby whale
, RATIONALE
For data to be continuous, it means it can take on any value inside of an interval. Since
the weight of a baby whale can take on any numerical value inside of possible ranges of
weights, it is continuous.
3 Margin of Error
A poll was conducted two weeks before an election and showed that the incumbent
would win with 56% of the vote and a margin of error of 4%.
If the incumbent needs to receive at least half the votes to win the election, can there be
confidence in the incumbent’s victory?
• Yes, because the lowest the incumbent could receive is 52% of the vote.
• Yes, because the poll stated that the incumbent will win with 60% of the vote.
• No, because she could receive as low as 4% of the vote.
• None of the above
RATIONALE
Recall for a confidence interval, we take the point estimate +/- margin of error. Using this
framework we take the point estimate of 56%, then add and subtract the margin of
error, 4%.
This gives us a CI of 52% to 56%.
Since the lower value is greater than 50%, we are confident that the incumbent should
earn at last 50% of the votes and win the election.
4 Placebo
Max conducted a clinical trial for a new vitamin supplement. He had two groups in his
clinical trial. The control group was given a sugar pill, and the treatment group was given
the new vitamin supplement. However, many of the participants in the control group
reported improvements in their general health, similar to the treatment group.
The ________ may describe the reason some participants from the control group
reported health improvements.
