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SQA Advanced Higher Statistics Statistical Inference overview quiz quiz

15questions. Pick an answer and you'll see why right away.

  1. A numerical summary computed from a sample, such as xˉ\bar{x}, is called a:

  2. In stratified sampling, the number taken from each stratum is in proportion to:

  3. Systematic sampling can become biased when the population list:

  4. The standard error of the sample mean from a population with standard deviation σ\sigma is:

  5. A population has μ=60\mu = 60, σ=10\sigma = 10 and samples of size 2525 are taken. The standard error is:

  6. The central limit theorem says the sample mean is approximately normal:

  7. If the parent population is itself normal, the sample mean is:

  8. An unbiased point estimate of the population variance from a sample uses the divisor:

  9. You should use Student's t-distribution for a confidence interval for a mean when:

  10. Compared with the normal distribution, the t-distribution has:

  11. A 95% confidence interval for a mean has the form:

  12. Increasing the confidence level from 95% to 99% makes the interval:

  13. '95% confidence' means that, on repeating the procedure many times:

  14. To halve the standard error of the sample mean, the sample size must be:

  15. In a statistical investigation, most marks are awarded for: