Need help with probability and statistics

Statistics
Tutor: None Selected Time limit: 1 Day

From generation to generation, the mean age when smokers first start to smoke varies. However, the standard deviation of that age remains constant at around 2.1 years. A survey of 41 smokers of this generation was done to see if the mean starting age is at least 19. The sample mean was 18.2 with a sample standard deviation of 1.3. Do the data support the claim at the 5% level?   

actual question:

Nov 16th, 2015

Thank you for the opportunity to help you with your question!

null hypothesis=starting age to smoking is 19

alternative hypothesis=starting age is not 19

actual mean is 18.2 and the expected mean is 19. We need to normalize our data since we are assuming normality and we need to find Z statistic to be able to either accept or reject our hypothesis

(18.2-19)/1.3= -0.6154

we need normal tables to check our Z statistic of -0.6154 and make the necessary conclusion.

our result is 0.9463 which is greater than our level of significance of 0.05. we reject the null hypothesis and conclude that the data is not sufficient enough to claim a starting age of 19 to smoking

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 16th, 2015

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
...
Nov 16th, 2015
...
Nov 16th, 2015
Dec 5th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer