Summary
Summary STK110-TUTORIAL 8
- Course
- Institution
- Book
with these past papers you are guaranteed a distinction with lots of practice!!!!!!!!!
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
STK 120-SEMESTER TEST 1 2022 (MEMO)
-
TUTORIAL 7 MEMO
-
TUTORIAL 8A MEMO
Seller
Follow
thembisilemagudulela
Content preview
STK110 TUT 8 on Chapter 8 MEMORANDUMQuestion 1 a) It is reasonable to assume b) The school psychologist is currently busy c) Suppose we wish to estimate the
that the age distribution of studying stress during exam time. She has mean age at which patients with
Interval estimation: Comrades athletes that finish developed a questionnaire that she believes hypertension is diagnosed.
Population mean, 𝝈 known a race is normal distributed measures stress. 12 Randomly selected individuals
with standard deviation of 9 A score above 80 indicates stress at a dangerous with diagnosed hypertension ages
𝜎 years. If the average age of a level. A random sample of 16 senior learners were recorded. We assume that age
𝑥̅ 𝑧 random sample of 25 revealed an average stress level of 89.29. at diagnoses is approximately
√𝑛 Comrades athletes that normally distributed with known
finished a race is 35, You may assume that stress levels are normally standard deviation of 7.2. Calculate
calculate a 99% confidence distributed with a standard deviation of 8. a 95% confidence interval
interval for the population Data: 32.8 40.0 41.0 42.0 45.5 47.0
mean age of Comrades Calculate a 90% confidence interval for the 48.5 50.0 51.0 52.0 54.0 59.2
athletes that finish a race. population mean stress level of senior learners.
What can you conclude from this result?
Sample average 35 89.29 46.9167
Sample size 25 16 12
Population standard deviation 9 8 7.2
Confidence coefficient 0.99 0.90 0.95
Confidence interval 𝜎 𝜎 𝜎
𝑥̅ 𝑧 𝑥̅ 𝑧 𝑥̅ 𝑧
√𝑛 √𝑛 √𝑛
9 8 7.2
35 2.575 89.29 1.645 46.9167 1.96
5 4 √12
(30.365, 39.635) (86, 92.58) = 46.9167 4.0738
(42.8429, 50.9938)
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 thembisilemagudulela. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
71184 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now