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Post Test. Data and Sampling Questions and Answers 2024
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Post Test. Data and SamplingWhich statement is true? - answerTo calculate a point estimate, we need to know the
sample size.
The table gives a car dealer's weekly sales for a random sample of 26 weeks. The
sample mean of cars sold per week is - answer5
A school supervisor wants to determine the percentage of students that bring their lunch
to school.
Which of the following methods would assure random selection of a sample population?
- answerThe supervisor should randomly select students from all grade levels taught at
the school.
A restaurant owner wants to determine the effectiveness of his servers. The owner
places a survey regarding the servers' effectiveness with randomly selected customer
bills.
What is the sample? - answerThe sample is the randomly selected customers.
Members of a student council are designing a school float for a parade. They decide to
poll 10% of the student body to get feedback about the theme they have chosen.
What would most likely happen if they decided to randomly sample 5% of the student
body instead? - answerThe sample proportion would less closely model the population
proportion.
A company manufactures 2,000 units of its flagship product in a day. The quality control
department takes a random sample of 40 units to test for quality. The product is put
through a wear-and-tear test to determine the number of days it can last. If the product
has a lifespan of less than 26 days, it is considered defective. The table gives the
sample data that a quality control manager collected. - answerThe point estimate of the
population mean is 32.3 , and the point estimate of the proportion of defective units is
0.5 .
Students in a reading class have three options for their book project: making a
brochure, writing a news article, or designing a computer presentation.
From past years, the teacher has determined that 20% of students usually choose to
make a brochure, 30% of students usually choose to write a news article, and the
remaining students usually choose to design a computer presentation.
If the teacher uses 20 colored chips in three different colors to model this situation, how
many colored chips should she use to represent each book project option?
making a brochure: ______ blue chips
writing a news article: ______ yellow ships
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