WPC 300 FINAL EXAM WITH COMPLETE SOLUTIONS GRADED A+
5 views 0 purchase
Course
WPC 300
Institution
WPC 300
WPC 300 FINAL EXAM WITH COMPLETE SOLUTIONS GRADED A+
Typical sampling mistake - Answer- -Unrepresentative sample
-Biased respondents
-Low response rate (non-response bias) or lower sample size
-Biased questions
Online Survey - Answer- Polls are completed only by visitors to the site
-Th...
Online Survey - Answer- Polls are completed only by visitors to the site
-Those with an interest in the website's mission are the only ones who will participate
Non-response - Answer- -Some individuals are less likely to respond to a survey, e.g.,
want their opinion about smoking weed
Social Desirability - Answer- -Want to study what factors lead to academic dishonesty
-Who will be participating?
Observation: - Answer- Expected mean of the sample means is the true population
mean
-The standard deviation of sample mean distribution (SE) decreases as the sample size
"n" increases
-Increasing sample size "n" reduces the average sampling error
confidence interval - Answer- -is a range of values that is likely to contain the population
mean
confidence level - Answer- - is the proportion of samples that will yield a confidence
interval that actually contains
the population means.
Z-statistics - Answer- is good for larger sample (n>30) with underlying distribution of the
population may or
may not be normal
T-statistics - Answer- - is used when population SD is unknown
Testing the hypothesis - Answer- -When p-value is lower than α, then reject the null
hypothesis
Confidence Level - Answer- If CL = 98%, the confidence interval gets wider than when
CL = 95%.
-You do so to be more confident in your results.
, Sample Size - Answer- -If you increase the sample size, the CI becomes narrower
-You get more precise measurement
Standard Deviation - Answer- -If you increase your SD, the confidence interval gets
wider
-Your have more uncertainty and less precision in your measurement
Anova - Answer- Useful when you are comparing more than two sample means
-Observations are independent Equal variances for each population
-This process investigates variances to establish if the means are significantly different
Bonferroni - Answer- extremely general and simple, but often not powerful
Tukey's - Answer- the best for all-possible pairwise comparisons when sample sizes are
unequal or confidence intervals are needed; very good even with equal samples sizes
without confidence intervals
-Stepdown - Answer- -the most powerful for all possible pairwise comparisons when
sample sizes are equal
Dunnett's - Answer- -for comparing one sample ("control") to each of the others, but not
comparing the others
to each other.
Correlations - Answer- -When variables are correlated, it means they vary together
-Correlation can be positive, negative or zero.
Descriptive Statistics - Answer- -Shows the strength of a relationship
How reliable is conclusion - Answer- You can infer/conclude about the population with a
certain confidence level. (You will be
able to find out if the claim is really correct or not with certain confidence level - 95%)
Random sampling - Answer- is a part of the sampling technique in which each sample
has an equal probability of
being chosen
-meant to be an unbiased representation of the total population.
Inferential Statistics - Answer- -Allows to make decision about a parameter in the
population
-You want to know if the population correlation is different from zero?
- Ho = There is no significant correlation between the variables, r=0
-Ha = Null hypothesis is not true
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 Scholarsstudyguide. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
