A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. Final examination scores from a random sample of students enrolled today and from a random sample of students enrolled five years ago were selected.
Today Five years ago
x bar 82 88
σ squared 112.5 54
η 45 36
The 95% confidence interval for the difference between the two population means is .
a. -9.92 to -2.08
b. -3.92 to 3.92
c. -13.83 to 1.84
d. -24.228 to 12.23
Answers: 2
Other questions on the subject: Business
Business, 21.06.2019 19:20, salvadorperez26
You wish to buy a cabin in 15 years. today, the cabin costs $150,000. you believe the price of the cabin will inflate at 4% annually. you want to invest a single amount of money (lump sum) today and have the money grow to equal the future purchase price of the cabin 15 years from now. if you can earn 10% annually on your investments, how much do you need to invest now, in order to be able to purchase the cabin?
Answers: 3
Business, 21.06.2019 23:30, reddmeans6
Starting at age 30, you deposit $2000 a year into an ira account for retirement. treat the yearly deposits into the account as a continuous income stream. if money in the account earns 7%, compounded continuously, how much will be in the account 35 years later, when you retire at age 65? how much of the final amount is interest?
Answers: 2
Business, 22.06.2019 14:20, Champion9701
For the year ended december 31, a company has revenues of $323,000 and expenses of $199,000. the company paid $52,400 in dividends during the year. the balance in the retained earnings account before closing is $87,000. which of the following entries would be used to close the dividends account?
Answers: 3
Do you know the correct answer?
A statistics teacher wants to see if there is any difference in the abilities of students enrolled i...
Questions in other subjects:
Biology, 10.04.2020 18:16
Arts, 10.04.2020 18:16
History, 10.04.2020 18:16
