Exam (elaborations)
STA 2023 Elementary Statistics STA 2023 Final Exam Submission Review Questions and Answers
- Institution
- Saint Petersburg College
STA 2023 Elementary Statistics
[Show more]
Content preview
A certain academic program boasts that 87% of their graduates find full-time employment in their field within thefirst year of graduation. The academic director is concerned that market factors may have adversely affected the
full-time placement rate and decides to perform a Hypothesis Test to see if her concern is warranted.
The hypothesis test is performed at a 5% significance level and the resulting p-value is 0.07.
Assume that all conditions for testing have been met and choose the statement that contains the correct
conclusion.
Question options:
there is not sufficient sample evidence to conclude that the full-time placement rate is now less than 87%
Use the model to make the appropriate prediction.
A sociologist wanted to determine whether there was a relation between a state's poverty rate (x) and its teen
pregnancy rate (y). Data from all 50 states produced the regression model:
yˆ=4.3+1.4(x
What does the model suggest for the poverty rate of Florida, which has a poverty rate of 16.6?
Question options:
27.5%
Select the most appropriate response.
As sample size increases (other things being equal), what tends to happen to 95% confidence intervals?
Question options:
They become narrower.
Select the most appropriate response.
A p-value=0.35 indicates that:
o no sample evidence against the null hypothesis.
Select the most appropriate response.
What would happen (other things being equal) to a confidence interval if you calculated a 99% confidence
interval rather than a 95% confidence interval?
Question options:
State the null and alternative hypotheses you would use to test the following situation.
The American Automobile Association (AAA) claims that 54% of fatal car/truck accidents are caused by driver error.
A researcher believes the percentage has decreased during the past year and tests the claim at the 10% level of
significance.
Question options:
H0 : p=0.54
H1 : p<0.54
Determine the expected count under the null hypothesis.
Is achieving a basic skill level in a subject independent to the location of the school? A random sample of students
categorized by the location of school and the number achieving basic skills in three subjects is shown in the table.
This study source was downloaded by 100000850640191 from CourseHero.com on 10-10-2024 07:49:37 GMT -05:00
https://www.coursehero.com/file/54384642/Final-Review-test-versiondocx/
, Subject
Location of School Reading Math Science Totals
Urban 43 42 38 123
Suburban 63 66 65 194
Totals 106 108 103 317
Under the null hypothesis for a Chi-square test of independence, what would be the expected number of students
achieving basic math skills in the urban schools?
Question options:
41.9
Select the most appropriate response.
In hypothesis testing, a Type I error occurs when:
Question options:
esis is rejected when the null hypothesis is true.
Construct the requested confidence interval.
A meteorologist was interested in the average speed of a thunderstorm in his area. He sampled 13 thunderstorms
and found that the average speed at which they traveled across the area was 15 miles per hour with
a sample standard deviation of 1.7 miles per hour.
Assuming the speed of a thunderstorm is approximately normal, construct a 99% confidence interval for the true
average speed of a thunderstorm in his area.
Question options:
Conduct the appropriate hypothesis test and compute the p-value.
Sunshine Air has determined that their no-show rate for passengers booked on a flight is 6%. The Airline has
recently increased the cost of its travel insurance and and suspects the no-show rate for passengers will decrease.
A random sample of 380 reservations resulted in 18 no-shows.
At the 0.10 significance level, is there strong enough sample evidence to suggest that the no-show rate in less
than 6%?
Question options:
he p-value = 0.15
Find the correlation coefficient.
A group of persons filled in a questionnaire their age and the number of states they visited. The results are
recorded in the table below.
This study source was downloaded by 100000850640191 from CourseHero.com on 10-10-2024 07:49:37 GMT -05:00
https://www.coursehero.com/file/54384642/Final-Review-test-versiondocx/
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 YourAssignmentHandlers. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83637 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
