Confidence Intervals for the 
             Mean (Large Samples)
                                                        2
                          Next
    • In this chapter, you will learn an 
      important technique of statistical 
      inference—to use sample statistics to 
      estimate the value of an unknown 
      population parameter.
                                                        3
                          Next
    • In this section, you will learn how to 
      use sample statistics to make an 
      estimate of the population parameter 
      when the sample size is at least 30 
      or when the population is normally 
      distributed and the standard 
      deviation is known. To make such an 
      inference, begin by finding a point 
      estimate.
                                                        4
           A statistic is unbiased if it does not 
           A statistic is unbiased if it does not 
           overestimate or
           overestimate or
           underestimate the population parameter.
           underestimate the population parameter.
                                                              5
                                                        6