Hypothesis Testing and Contingency Tables (AQA A-Level Further Maths): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why is the denominator rather than in the sample variance formula?
Why is the denominator rather than in the sample variance formula?
Makes an unbiased estimator of
What does it mean for a statistic to be an unbiased estimator?
What does it mean for a statistic to be an unbiased estimator?
Expected value equals population parameter
If a population has variance and sample size is , what is the variance of ?
If a population has variance and sample size is , what is the variance of ?
What sample size is considered large enough to use in place of ?
What sample size is considered large enough to use in place of ?
At least 30
What is the standard error of the mean when population variance is unknown?
What is the standard error of the mean when population variance is unknown?
What is the -value for a 95% confidence interval?
What is the -value for a 95% confidence interval?
1.96
What happens to confidence interval width when confidence level increases?
What happens to confidence interval width when confidence level increases?
Width increases
If sample size is multiplied by 4, what happens to the confidence interval width?
If sample size is multiplied by 4, what happens to the confidence interval width?
Halves
After calculating a 95% CI, how should you interpret it?
After calculating a 95% CI, how should you interpret it?
We are 95% confident lies in interval
When should you use instead of in the confidence interval formula?
When should you use instead of in the confidence interval formula?
When population variance is known