Confidence interval with t Quiz
10 questions · easy to harder · University Statistics · score and step-by-step answers
How it works
- 10 questions, about 30 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 0 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
95% confidence interval: sample mean 50, sample sd 8, n 16Type the answer.
2 Question 2
95% confidence interval: sample mean 12, sample sd 3, n 9Type the answer.
3 Question 3
90% confidence interval: sample mean 30, sample sd 4, n 16Type the answer.
4 Question 4
95% confidence interval: sample mean 18, sample sd 2, n 4Type the answer.
5 Question 5
98% confidence interval: sample mean 100, sample sd 12, n 9Type the answer.
6 Question 6
99% confidence interval: sample mean 22, sample sd 4, n 16Type the answer.
7 Question 7
95% confidence interval: sample mean 140, sample sd 18, n 4Type the answer.
8 Question 8
95% confidence interval: sample mean 4.2, sample sd 0.9, n 10Type the answer.
9 Question 9
99% confidence interval: sample mean 15, sample sd 2.5, n 20Type the answer.
10 Question 10
98% confidence interval: sample mean 9, sample sd 1.5, n 15Type the answer.