The article Growth Response in Radish to Sequential and Simultaneous Exposures of NO2 and SO2 (Environmental Pollution [1984]: 303325) compared a control group (no exposure), a sequential exposure group (plants exposed to one pollutant followed by exposure to the second four weeks later), and a simultaneous-exposure group (plants exposed to both pollutants at the same time). The article states, Sequential exposure to the two pollutants had no effect on growth compared to the control. Simultaneous exposure to the gases significantly reduced plant growth. Let and represent the sample means for the control, sequential, and simultaneous groups, respectively. Suppose that Use the given information to construct a table where the sample means are listed in increasing order, with those that are judged not to be significantly different underscored.

STAT 2004 WEEK 12 Statistical hypotheses- Research questions we wish to test using statistical evidence. o Ex: It’s always windy in Blacksburg. Suppose W represents wind speed in the US. W ~N(7,3) US US Null hypothesis- Blacksburg7 mph Alternative hypothesis- Blacksburg mph o The alternative hypothesis is what you think the truth is. The null hypothesis always includes an equal sign. Writing hypotheses: o Make alternative based on what you want to show. o Make null the opposite. Making a non 95% confidence interval: o Determine what the leftover or alpha level is o Determi