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Unit 1 Intro to Statistics (Sophia) Practice Test Questions with Answers
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Unit 1 Intro to Statistics (Sophia) Practice Test Questions with Answers
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Unit 1 Intro to Statistics (Sophia)Practice Test Questions with Answers
In a survey of a large high school class, responses to which two of the
following questions will be QUALITATIVE? - -•Are you male or female?
•Are you right handed or left handed?
-Which of the following describes simple random sampling? - -Choose a
sample so that every member of the population has an equal chance of
being selected for the sample.
-Data that was gathered for a past study and re-used to answer questions in
a present study is called? - -Available Data
-Which of the following definitions corresponds with an observational study?
- -Measuring Variables of interest but not attempting to influence responses
-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? - -Random error, the numbers were different due to variability
inherent in sampling.
-One typical way to select a sample is to randomly pick phone numbers from
a telephone book.
Which of the following explains how the selection of the sample could be
biased? - -All of these choices would introduce a bias
-In measuring the mass of a 50 gram weight in a science class, some
students use a poorly calibrated balance and obtain a value of 55.5 grams.
The relative error in their calculation is _________. - -11%
-Which of the following data types will be continuous? - -Weight of a baby
whale
-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.
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