BESC 3010 - TEST 2 QUESTIONS AND ANSWERS | LATEST UPDATE | 2024/2025 | GRADED A+
4 views 0 purchase
Course
BESC 3010 -
Institution
BESC 3010 -
BESC 3010 - TEST 2 QUESTIONS AND
ANSWERS | LATEST UPDATE |
2024/2025 | GRADED A+
What is the purpose of calculating a confidence interval in data analysis?
A confidence interval provides a range that likely includes the population parameter, giving
an estimate of the precision and reliabilit...
BESC 3010 - TEST 2 QUESTIONS AND
ANSWERS | LATEST UPDATE |
2024/2025 | GRADED A+
What is the purpose of calculating a confidence interval in data analysis?
✔✔A confidence interval provides a range that likely includes the population parameter, giving
an estimate of the precision and reliability of the sample statistic.
How is a point estimate different from an interval estimate?
✔✔A point estimate gives a single value as an estimate of a population parameter, while an
interval estimate provides a range of values, offering more information about the uncertainty
around the estimate.
What does a low p-value indicate in hypothesis testing?
✔✔A low p-value (typically less than 0.05) suggests that the observed result is unlikely to occur
under the null hypothesis, leading researchers to consider rejecting the null.
Why do researchers use the standard error in statistics?
✔✔The standard error indicates how much variability there is in a sample statistic, helping
researchers assess how well the sample represents the population.
1
,What does the "95%" in a 95% confidence interval signify?
✔✔The "95%" means that if we were to take many samples, about 95% of the confidence
intervals calculated from those samples would contain the true population parameter.
Explain the term "degrees of freedom" and its role in statistical tests.
✔✔Degrees of freedom refer to the number of independent values in a calculation. In statistical
tests, it helps determine the critical values and affects the test’s accuracy.
What is a two-tailed test, and when would you use it?
✔✔A two-tailed test checks for effects in both directions, testing whether a parameter differs
significantly from a hypothesized value in either direction. It’s used when we don’t have a
specific direction in mind.
How does sample size affect a confidence interval?
✔✔A larger sample size results in a narrower confidence interval, meaning the estimate is more
precise. Smaller sample sizes produce wider intervals, reflecting more uncertainty.
What is statistical power, and why is it important?
2
, ✔✔Statistical power is the probability of correctly rejecting a false null hypothesis. High power
reduces the risk of type II errors, making results more reliable.
What does a significant ANOVA result imply about group means?
✔✔A significant ANOVA result indicates that there are differences among group means, but it
doesn’t specify which groups differ. Further testing is needed for detailed comparisons.
What is a t-distribution, and how is it different from a normal distribution?
✔✔A t-distribution is similar to the normal distribution but has thicker tails, allowing for more
variability in smaller samples. It’s used when sample sizes are small and population variance is
unknown.
How do researchers interpret a 99% confidence level?
✔✔A 99% confidence level means that we are 99% confident the true population parameter lies
within the confidence interval, with only a 1% chance of it falling outside the interval.
What is an effect size, and why do researchers measure it?
✔✔Effect size measures the strength of a relationship or the magnitude of an effect, helping
researchers understand the practical significance of results beyond just statistical significance.
3
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SterlingScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.79. You're not tied to anything after your purchase.
