Exam (elaborations)
STA1610Assessment 4
Exam of 7 pages for the course STA1610 at STA1610 (STA1610Assessment 4)
[Show more]
Content preview
Assessment 4Open course index
Open block drawer
Started on Tuesday, 29 August 2023, 10:27 PM
State Finished
Completed on Tuesday, 29 August 2023, 10:39 PM
Time taken 12 mins 25 secs
Marks 18.00/20.00
Grade 90.00 out of 100.00
Question 1
Correct
Mark 2.00 out of 2.00
Flag question
Question text
A random sample of size 100 results in a sample mean of 100. The population standard deviation
is known to be 25. What is the value of the standard error of the mean?
a.
1.50
b.
2.50
c.
3.50
d.
4.11
e.
6.45
Question 2
Correct
Mark 2.00 out of 2.00
Flag question
Question text
A household survey based on a of sample of 50 households in a small rural village found the
average household income to be R2500 with a standard deviation R800. Construct the 90%
confidence interval estimate for the population mean household income and choose the correct
answer from a list of options below.
a.
, (2310.27; 2689.73)
b.
(2272.59; 2727.41)
c.
(2196.79; 2803.21)
d.
(2313.89; 2686.11)
e.
(2319.40; 2680.60)
Question 3
Correct
Mark 2.00 out of 2.00
Flag question
Question text
Consider a t distribution with 9 degrees of freedom. Which one of the following statements is
incorrect?
a.
The t value associated with a lower tail probability of 0.1 is +1.383.
b.
The t value associated with an upper tail probability of 0.05 is +1.833.
c.
95% of the area under this t distribution falls between -2.262 and +2.262.
d.
98% of the area under this t distribution falls between -2.821 and +2.821.
e.
99% of the area under this t distribution falls between -3.250 and +3.250.
Question 4
Correct
Mark 2.00 out of 2.00
Flag question
Question text
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 EFT, 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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller smartacademy1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R79,00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67866 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now