Hi everyone! Read through the material below, watch the videos, work on the Excel lecture and follow up with your instructor if you have questions.

 

Learning Outcomes.

  • Determine if the data supports a hypothesis at a given significance level using known distributions.

Topic. This lesson covers: Inference about a Population Mean with Unknown Standard Deviation

WeBWorK. Sets 9.3-9.6

Excel Lecture #22Download

 

Hypothesis Testing with Sigma Unknown

A used car dealer says that the mean price of a 2008 Honda CR-V is at least $20,500. You suspect this claim is incorrect and find that a random sample of 14 similar vehicles has a mean price of $19,850 and a standard deviation of $1084. Is there enough evidence to reject the dealer’s claim at alpha = 0.05? Assume the population is normally distributed.