Employment Investigaion
Employment Cont.
Number Sense (Confidence Interval)
Gas Investigation (Challenge)
Class Information
100
The variable for the employment investigation (either categorical or quantitative)
What is Categorical?
100
The variable we're collecting is... (the responses/data are we collecting)
Whether a full-time undergrad works/dosent work
100
The multiplier for a 95% confidence interval
What is 2
100
The question AND hypothesis for this investigation are... (using Ho and Ha)
What is the mean price of gas in OC?
Ho: mu=5.50 (or any number really)
Ha: mu=/5.50 (same number as above)
100
If you are looking for extra practice, where can you find some?
+50 pts for each resource listed
Textbook
Practice Gas investigation exam
Make-your-own study guide discussion board
Resources tab of canvas
Ask professor or madi if they have any
mess around with Rguroo
200
The question asked in our employment investigation
Are Cal-State full-time undergrad students more commonly employed than other college undergrads?
200
We use this in our parameter/statistic to measure our data.
proportion
200
n represents _____ ______ in the equation for a confidence interval.
S represents ____ ________ in the equation for a confidence interval.
n represents sample size in the equation for a confidence interval.
S represents standard deviation in the equation for a confidence interval.
200
List (50pts per item listed) for my gas investigation what is my...
variable
parameter
statistic
observational unit
Sample (what is it for this investigation)
Population (what is it for this investigation)
(+50pts if you explain all of them)
Variable - gas price
parameter - mu - true mean population gas price
statistic - x-bar - sample mean gas price
Observational Unit - Gas station
Sample - SRS of gas stations in OC
Population - ALL gas stations in OC
:)
200
If I have a specific question, I can go to...
+50 per answer
Office hours
tutoring center
SI (so long as it isnt from homework or in class)
300
The definition of what p̂ represents
What is the sample proportion?
300
The population proportion is represented by this symbol
What is π (pi)?
300
Draw the equation for a 95% confidence interval
300
Walk me through how I could find a 95% or 99% confidence interval using Rguroo (can explain steps or show them on a computer)
First select or inport your dataset
Then click "analytics", then "analytics" then "mean infrence" then "one population"
Select your dataset and your variable, and then input the level of confidence you want and select the "t-statistic" check box
300
If I missed some notes, I can find good notes for my class....
On the canvas page (in the slides)!!
from a friend
400
The null hypothesis for our employment investigation
What is
Ho: πcsu=.4
Ho: πcsu=πother
The proportion of employed full-time undergrad students in the csu is the same as other colleges
400
The alternative hypothesis for our employment investigation
What is...
- Ha: πCSU>.4
- Ha: πCSU>πother
- The number of students who are employed at csu who are also undergrad and fulltime will be greater than other colleges
400
As the percentage of my confidence interval increases, what happens to my interval? (Describe breadth)
What part of the equation changes?
+100 pts for explanation per question (2 questions)
The confidence interval will get broader
The multiplier changes, meaning the MOE increases
400
The conditions that must be met to see if our confidence interval is valid are...
roughly symmetrical sample distribution
or
sample size of at least n=20
400
What are professors doing during office hours if nobody comes?
NOTHING! (waiting for you to come)
500
If the true population proportion was π=.7, would we reject our null hypothesis or fail to reject our null hypothesis?
Reject our null hypothesis.
500
If the true population proportion was π=.7, would we say that we can accept or reject the alternative hypothesis?
Accept the alternative hypothesis
500
What happens to my confidence interval if I have a bigger sample size (assuming all other numbers stay the same).
+100 pts for explination
The confidence interval will shrink (get narrower)
500
CANNOT COMPLETE UNTIL QUESTION NUMBER SENSE 300 IS COMPLETE!!!
I took a sample of 30 gas stations, but only found information on 25 gas stations. the standard deviation is 5, and we are using a 95% confidence interval. My statistic (sample mean) is $5.00. Find AND interpret a 95% confidence interval for this information
(3,7)
The plausible values of the average price of unleaded gas in Orange County, according to our confidence interval, are any price within the range of $3.00 to $7.00 per gallon.
500
Office hours for my professor are in this room
MH 187 for professor Jamshidi
____other for other professor____