Exam (elaborations)
Biostatistics exam 3 questions with complete solutions A+ rated
- Course
- Institution
Biostatistics exam 3 questions with complete solutions A+ rated
[Show more]
Content preview
Biostatistics exam 3 questions withcomplete solutions A+ rated
T/F Two samples will probably have different means even if they are both the same size and they are
both selected from the same population? - correct answer ✔✔True
A researcher selects a sample and administers a treatment to the individuals in the sample. If the sample
is used for a hypothesis test, what does the null hypothesis (Ho) says about the treatment? - correct
answer ✔✔the treatment has no effect on the scores
if a hypothesis test produces a z score in the critical region, what decision should be made? - correct
answer ✔✔reject the null hypothesis
accurately describe a hypothesis test - correct answer ✔✔an inferential technique that uses that data
from a sample to draw inferences about a population
accurately describe the critical region - correct answer ✔✔outcomes with very low probability if the null
hypothesis is true
a sample of n=25 individuals is selected from a population with u=70, and a treatment is administered to
the sample. What is expected if the treatment actually has no effect? - correct answer ✔✔the sample
mean should be close to 70 and should lead you to fail to reject the null hypothesis
what is an accurate definition of a type 1 error? - correct answer ✔✔rejecting a true null hypothesis
the critical boundaries for a hypothesis test are z= +/- 1.96 . If the z score for the sample data is z = +/-
1.89, what should be done? - correct answer ✔✔fail to reject the null hypothesis (Ho)
what is the first step in a hypothesis test - correct answer ✔✔state your hypotheses
, what is the second step in the hypothesis test - correct answer ✔✔set your decision criteria
what is the third step in the hypothesis test - correct answer ✔✔collect data and calculate
what is the fourth step in the hypothesis test - correct answer ✔✔make a decision based on your results
under what circumstances can a very small treatment effect still be significant - correct answer ✔✔if the
sample size (n) is very large
what is an accurate definition form the power of a statistical test? - correct answer ✔✔the probability of
rejecting a false null hypothesis
what will increase the power of a statistical test - correct answer ✔✔changing the sample size from n=20
to n=100
when n is small (less than 30), how does the shape of the t distribution compare to the normal
distribution? - correct answer ✔✔it is flatter and more spread out than the normal distribution
on average, what value is expected for the t statistic when the null hypothesis is true - correct answer
✔✔0
if two samples are selected from the same population, under what circumstances will the two samples
have exactly the same t statistic? - correct answer ✔✔if the samples are the same size and they have the
same mean and the same variance
(solve) a sample of n=9 scores has a variance = 36. what is the estimated standard error for the sample? -
correct answer ✔✔Sm= √(variance/n) = 2
(solve) a researcher conducts a hypothesis test using a sample from an unknown population. If the t
statistic has df=30, how many individuals were in the sample? - correct answer ✔✔{df= n-1 } >>> n=31
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 BukayoSaka120. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
62890 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now