Ch.9: Sampling Distributions: MeanWorksheetSee all chapters
All Chapters
Ch.1: Displaying Numeric Data
Ch.2: Measures of Center and Spread
Ch.3: Probability and Rules
Ch.4: The Discrete Random Variable
Ch.5: The Binomial Random Variable
Ch.6: Types of Continuous Random Variable Distributions
Ch.7: The Standard Normal Distribution (Z-Scores)
Ch.8: Using The Z-Score
Ch.9: Sampling Distributions: Mean
Ch.10: Sampling Distributions: Proportion
Ch.11: Hypothesis Testing: Part 1
Ch.12: Hypothesis Testing: Part 2

Concept #1: Determining the Large Sample Confidence Interval for a Population Mean

Concept #2: Determining the Large Sample Confidence Interval for a Population Mean: Intro

Practice: Gas prices are getting more and more expensive. The average gas price, from a random sample of 100 gas stations, was $3.50. It is assumed that gas prices have a standard deviation of $0.04. Construct an 80% confidence interval for the true mean gas price in the United States.

Practice: You want to take a trip to Paris. You randomly select 225 flights to Europe and find a mean and standard deviation of $1500 and $900, respectively. Construct a 95% confidence interval for the average price for a trip to Paris.

Practice: You want to purchase one of the new Altimas. You randomly select 400 dealerships across the United States and find an average and standard deviation of $25,000 and $2500. Construct a 94% confidence interval for the true average price for the new Nissan Altima.