A researcher is interested in determining if younger individ…

A researcher is interested in determining if younger individuals are better at maintaining their balance than older individuals.  To test this, individuals were asked to stand on one foot and press a button when they heard the buzzer go off.  The amount of sway in the individual’s position (in mm) was recorded. The summary of the findings is provided in the table below: Sample n s Elderly 9 22.2 10.3 Young 8 15.13 3.91 Use a 95% level of confidence to estimate the difference in mean sway between the groups and you may assume that the amount of sway in each group is approximately normal.  Would it be reasonable to support the claims of the researcher? Explain fully.  

A local researcher would like to know if there is a signific…

A local researcher would like to know if there is a significant difference in the rates of individuals who smoke cigarettes based on their gender.  The output below is from a test run using sample information collected.  Construct an interval estimate for the difference between rates of smoking between men and women. Test and CI for Two Proportions: Female, Male Variable   X    N  Sample p Female    18  129  0.139535 Male      29  167  0.173653