1F03 Final Exam Prep Questions and Answers Graded A+
3 views 0 purchase
Course
1F03 Prep
Institution
1F03 Prep
1F03 Final Exam Prep Questions and
Answers Graded A+
What is the purpose of a hypothesis test in statistics?
A hypothesis test is used to determine if there is enough evidence in a sample data to infer
that a certain condition holds for the entire population. It helps in making decisions or...
1F03 Final Exam Prep Questions and
Answers Graded A+
What is the purpose of a hypothesis test in statistics?
✔✔A hypothesis test is used to determine if there is enough evidence in a sample data to infer
that a certain condition holds for the entire population. It helps in making decisions or inferences
based on sample data.
How do you interpret a p-value in hypothesis testing?
✔✔A p-value measures the probability of observing the test results under the null hypothesis. A
low p-value (typically less than 0.05) indicates strong evidence against the null hypothesis,
suggesting it may be rejected.
What is the difference between Type I and Type II errors?
✔✔Type I error occurs when the null hypothesis is incorrectly rejected when it is actually true.
Type II error occurs when the null hypothesis is not rejected when it is actually false.
Explain the concept of a confidence interval.
1
,✔✔A confidence interval is a range of values, derived from sample data, that is likely to contain
the true population parameter with a specified level of confidence (e.g., 95%). It provides an
estimate of uncertainty around the sample statistic.
How do you calculate the standard deviation of a sample?
✔✔To calculate the standard deviation of a sample, first find the mean of the data, then compute
the variance by averaging the squared differences between each data point and the mean. The
standard deviation is the square root of the variance.
What is the purpose of a scatter plot in statistical analysis?
✔✔A scatter plot displays the relationship between two quantitative variables. It helps to
visualize trends, correlations, and patterns in the data, making it easier to identify any potential
relationships between the variables.
How do you interpret the correlation coefficient?
✔✔The correlation coefficient (r) ranges from -1 to 1. A value close to 1 indicates a strong
positive linear relationship, while a value close to -1 indicates a strong negative linear
relationship. A value around 0 suggests no linear relationship.
Provide an example of when you would use a t-test versus a z-test.
2
, ✔✔A t-test is used when comparing the means of two groups with a small sample size and when
the population standard deviation is unknown. A z-test is used with large sample sizes and when
the population standard deviation is known.
What is the Central Limit Theorem, and why is it important?
✔✔The Central Limit Theorem states that the distribution of the sample mean approaches a
normal distribution as the sample size becomes large, regardless of the population’s distribution.
It is crucial because it allows for the use of normal probability techniques in hypothesis testing
and confidence interval estimation.
Explain the difference between descriptive and inferential statistics.
✔✔Descriptive statistics summarize and describe the features of a dataset, such as mean,
median, and standard deviation. Inferential statistics use sample data to make generalizations or
predictions about a population, often involving hypothesis testing and confidence intervals.
Mindy is interested in testing weather those who follow a vegan diet are happier than those who
do not. She asks vegans and non vegans to complete the subjective happiness scale , and
compare their answers. Which of the following statements is true of Mindy's research? ✔✔when
doing a T-test mindy's null hypothesis is that vegans are similar in how happy they believe they
are
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 StellarScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
