STATS 250 Lecture Notes - Lecture 9: Confidence Interval, Statistical Parameter, Normal Distribution

• School: U of M
• Department: Statistics
• Course: STATS 250
• Professor: Brenda Gunderson

Document Summary

Stats 250: introduction to statistics - lecture 9: confidence interval for a population. Provides a range of reasonable values for the parameter with an associated high level of confidence. For example, we can say, we are 95% confidence that the proportion of. Americans who do not get enough sleep at night is somewhere between 0. 325 to. 0. 395, based on a random sample of n = 935 american adults. Describes our confidence in the procedure we used to make the interval. If we repeated the procedure many times, we would expect about 95% of the intervals to contain the population parameter. Let"s look at the example where a highway safety researcher, curious about the mean maximum distance at which drivers are able to read a sign, takes a random sample of n. = 16 drivers and measures the maximum distances (in feet) at which each can read the sign.