Replicate Diet with Martin Grass Seeds Control Diet 8.3 11.6 4.8 4.4 13.2 2.8 5.1 12 14.7 3.8 4.4 10.3 10 7.8 11 10 5.2 12 11 11 13 12 14 13 3.4 15 14 2.1 16 15 2.2 3.3 17 16 8.8 10.8 18 17 12.5 19 18 5.2 4.8 20 19 6.8 21 20 6.2 4.8 22 21 7.7 23 22 13.2 24 23 3.8 25 24 7.2 2.4 26 25 7.7 6.9 27 26 4.4 7.8 29 27 10.2 7.8 29 28 11 2.3 20 29 8.7 2.4 31 30 14 1.8

Attached is the data set:

Hint: to perform the analysis, the easiest way is to copy and paste the data into MS Excel and use the Data Analysis ToolPak to perform the requested calculations. Assume the treatment groups have equal variance.

Answer to 3 decimals unless otherwise specified.

All of these numbers are generated in the Data Analysis ToolPak:

 = mean weight of treatment group 

 = mean weight of control group

 = variance of treatment group

 = variance of control group

 = pooled variance

 = degrees of freedom (whole number)

 = calculated t statistic reported by the data analysis tool pack (NOTE: t statistic should always be a positive number)

 = P value reported by the data analysis tool pack (answer to 3 significant figures)

 = critical  reported by the data analysis tool pack.

Based on this, would you reject or fail to reject the null hypothesis? 

As a result of this experiment, researchers would or would not expect mice in fields with Martin Grass to weigh more than mice in fields without Martin Grass.