Margin of Error and Confidence Intervals (Leaving Cert Mathematics): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the term for the large group of people we want to learn about in research?
What is the term for the large group of people we want to learn about in research?
Population
What is the typical sample size used in opinion polls before elections?
What is the typical sample size used in opinion polls before elections?
Around 1000 people
What does the sample proportion represent?
What does the sample proportion represent?
Fraction of sample with characteristic
What is the population proportion ?
What is the population proportion ?
True fraction in entire population
What does the margin of error tell us?
What does the margin of error tell us?
How much sample may differ from truth
What is the formula for margin of error ?
What is the formula for margin of error ?
What is the margin of error for a sample size of 400?
What is the margin of error for a sample size of 400?
0.05 or 5%
What sample size is needed for a margin of error of 0.025?
What sample size is needed for a margin of error of 0.025?
1600
To halve the margin of error, how must the sample size change?
To halve the margin of error, how must the sample size change?
Quadruple it
If and , what is the lower bound of the confidence interval?
If and , what is the lower bound of the confidence interval?
0.29
What does a 95% confidence level mean?
What does a 95% confidence level mean?
Method works correctly 95% of time
For and 80 with pets, what is the 95% confidence interval (approximately)?
For and 80 with pets, what is the 95% confidence interval (approximately)?
0.115 to 0.205