In: Statistics and Probability
A student researcher compares the ages of cars owned by students and cars owned by faculty at a local state college. A sample of 217 cars owned by students had an average age of 7.62 years. A sample of 252 cars owned by faculty had an average age of 6.266.26 years. Assume that the population standard deviation for cars owned by students is 2.67 years, while the population standard deviation for cars owned by faculty is 3.41 years. Determine the 99% confidence interval for the difference between the true mean ages for cars owned by students and faculty.
Step 1 of 3 :
Find the point estimate for the true difference between the population means.
Answer:-
Given That:-
A student researcher compares the ages of cars owned by students and cars owned by faculty at a local state college. A sample of 217 cars owned by students had an average age of 7.62 years. A sample of 252 cars owned by faculty had an average age of 6.266.26 years. Assume that the population standard deviation for cars owned by students is 2.67 years, while the population standard deviation for cars owned by faculty is 3.41 years.
Determine the 99% confidence interval for the difference between the true mean ages for cars owned by students and faculty.
Step 1 of 3 :
Find the point estimate for the true difference between the population means?
Researcher compares the ages of cars owned by students and faculty at local state college
*Students:-
Sample size
average age year
Standard deviation
*Faculty :-
Sample size
average age years
Standard deviation years
Confidence Interval = 99%
level of significance = 0.01 [1-0.99=0.01]
* Point of estimate (or) Statistic
Z statistic for two different means
1.Null hypothesis
2.Alternative hypothesis
Confidence interval at 99%
students:-
Interval
Faculty:-