Many birds are injured or killed by flying into windows It appears that birds do not see windows Can tilting windows down so that they reflect earth rather than sky reduce bird strikes Researchers placed six windows at the edge of a woods two vertical two tilted downward 20 degrees and two tilted downward 40 degrees During the next four months there were 53 bird strikes 31 on the vertical windows 14 on the 20 degree windows and eight on the 40 degree windows Does the tilt have an effect Identify the variable and select the correct explanation of why it is categorical How many levels does this variable have The variable is window orientation of bird strikes Window orientation is categorical because it takes on values that are labels for the degree of tilt It has three levels The variable is the degree of cloudiness in the sky which is categorical because it takes on values for different levels of cloudiness It has three levels clear partially cloudy and cloudy The variable is number of bird strikes which is organized by the degree of the strike It has three levels The variable is window orientation of bird strikes Window orientation is categorical because it takes on values that are labels for the degree of tilt It has six levels Select the null and alternative hypotheses that are appropriate for the study s objective P40 1 Ha all three are equally likely P40 H not all three are equally likely Ho Po P20 Ho Po P20 Ho Po P20 Ha P40 0 Ho Po P20 P40 Ha not all three are equally likely