An investigation of water plant growth compares the heights (inches) of species of plant growing in two different lakes. The null hypothesis is H0:μ1 = μ2. Here are the summaries of the data...

An investigation of water plant growth compares the heights (inches) of species of plant growing in two different lakes. The null hypothesis is H0:μ1 = μ2. Here are the summaries of the data collected:

             Mean      StdDev        n

Lake1     8.6           3.8              25

Lake 2    7.6           2.3               25

what is the mean and standard error of the sampling distribution for the differences in sample means to be used by the hypothesis test?