3. Two years ago, 78% of people that owned a cell phone used the texting feature. A cell phone company want to know if that number has grown. The company samples 100 people with a cell phone and found that 85% of people text. Test the hypothesis at the 10% level of significance.
3. Two years ago, 78% of people that owned a cell phone used the texting feature. A cell phone company want to know if that number has grown. The company samples 100 people with a cell phone and found that 85% of people text. Test the hypothesis at the 10% level of significance.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Solve number 3
Transcribed Image Text:2.3/55
2. The average number of skittles in a bag are 30.7. A person thinks that number is different. The
person samples 10 bags of skittles and got an average of 31.8 with a sample standard deviation of
1.6. Test the hypothesis at the 5% level of significance.
3. Two years ago, 78% of people that owned a cell phone used the texting feature. A cell phone
company want to know if that number has grown. The company samples 100 people with a cell
phone and found that 85% of people text. Test the hypothesis at the 10% level of significance.
4. The percent of free throws made by an NBA team last year was 68%. The coach wants to know if t
number has changed. The coach randomly selects 200 free throw attempts and found that the
percent of free throws made is 68.8%. Test the hypothesis at the 5% level of significance.
A company that produces computers know that 4% of the computers made are defective. The
company upgraded their software in hopes that the defective rate would decrease. The compar
sampled 300 computers and found that 2.2% are defective. Test the hypothesis at the 5% level c
significance.
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