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Unit 1 Intro to Statistics (Sophia) Practice Test questions and answer
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Unit 1 Intro to Statistics (Sophia)Practice Test
A binomial question is ____an open question. A closed question is _____ a binomial
question. - correct answer-•never
•sometimes
A poll was conducted 2 weeks before an election and showed that the incumbent would win
with 56% of the vote and a margin error of 4%.
If the incumbent needs to receive at least half of the votes to win the election, can there be
confidence in the incumbents victory? - correct answer-Yes, because the lowest the
incumbent could receive is 52% of the vote
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? - correct answer-Yes, because the lowest the
incumbent could recieve is 52% of the vote.
A professional quarterback completed 66% of his passes in 2008 & 68% of his passes in
2009.
Of the following choices, which of the following two are correct about the quarterbacks
completion rate? - correct answer-• It rose by two percentage points
• it rose by 3% (2/66=.03)
A sample composed of people who are readily available or easily recruited is called a
_________sample. - correct answer-Convenience
A survey was conducted to find the number of hours that people spend on their phones in a
day. A group of 300 people in a shopping mall were asked about how long they spend on
their phone and it was found that 42 people spend at least 2 hours on their phone a day.
Which of these does not represent inferential statistics? - correct answer-14% of the people
surveyed in the shopping mall spend at least two hours on their phone in a day
At a school of 1500 students, 20% are left handed. A student randomly selects 200 students
and obtains 22% left handed students. A second student takes another random sample of
250 students and obtains 27% left handed students.
Which of the following should the differences between the percentages be attributed to? -
correct answer-Random error, the numbers were different due to variability inherent in
sampling.
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