Confidence Interval MCQ Tests
12th Class Statistics MCQ Tests
Confidence Interval
of 12th Class Statistics has 5 questions. If you take an online MCQ test, the system will randomly choose the questions. If you want to take the quiz by chapter then click the start test button.
Total Questions: 5
Total Marks: 5
Time: 5 Mins
Total Questions: 5
Total Marks: 5
Time: 5 Mins
5Min : 00 Sec Remaining
Question # 1
A medical researcher conjectures that smoking can result in wrinkled skin around the eyes. The researcher recruited 150 smokers and 250 nonsmokers to take part in an observational study and found that 95 of the smokers and 105 of the nonsmokers were seen to have prominent wrinkles around the eyes. Construct a 95 percent confidence interval for the difference between the two proportions.
Question # 2
If critical value of normal standard variable is 0.95 and standard error of specific statistic is 3.5, then margin of error is:
Question # 3
You are comparing freshmen and seniors at your college on hours spent studying per day. You pick a sample of 11 people from each group. For freshmen, the mean was 3 and the variance was 1.2. For seniors, the mean was 2 and the variance was 1. Calculate a 90% confidence interval on the difference between means (freshmen - seniors). What is the lower limit of this confidence interval?
Question # 4
The quality department of an electronics manufacturer randomly selected 100 resistors. The mean resistance of the resistors was 201.5Ω and the standard deviation was 0.4Ω. Find the 98% confidence interval for this problem.
Question # 5
If it is known that the 90% confidence limits to population mean are 41.05 and 44.35, what is the value of population standard deviation when the sample size is 64?
Total Questions
12345
Question # 1
A medical researcher conjectures that smoking can result in wrinkled skin around the eyes. The researcher recruited 150 smokers and 250 nonsmokers to take part in an observational study and found that 95 of the smokers and 105 of the nonsmokers were seen to have prominent wrinkles around the eyes. Construct a 95 percent confidence interval for the difference between the two proportions.
Question # 2
If critical value of normal standard variable is 0.95 and standard error of specific statistic is 3.5, then margin of error is:
Question # 3
You are comparing freshmen and seniors at your college on hours spent studying per day. You pick a sample of 11 people from each group. For freshmen, the mean was 3 and the variance was 1.2. For seniors, the mean was 2 and the variance was 1. Calculate a 90% confidence interval on the difference between means (freshmen - seniors). What is the lower limit of this confidence interval?
Question # 4
The quality department of an electronics manufacturer randomly selected 100 resistors. The mean resistance of the resistors was 201.5Ω and the standard deviation was 0.4Ω. Find the 98% confidence interval for this problem.
Question # 5
If it is known that the 90% confidence limits to population mean are 41.05 and 44.35, what is the value of population standard deviation when the sample size is 64?
Total Questions
12345
Statistics
- Representation and Exploration of Data
- Measure of Central Tendency or Averages
- Measures of Dispersion
- Index Numbers
- Regression and Correlation Analysis
- Analysis of Time Series
- Set Theory
- Introduction to Probability
- Random Variables and Distributions
- Binomial and Hypergeometric Distributions
- The Normal Distribution
- Sampling and Sampling Distributions
- Statistical Inference:Estimation
- Statistical Inference:Hypothesis Testing
- Association of Attributes
12th Class Online Classes 2026
Updated on: 10-05-2026
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