Use the standard deviation values of the two samples to find the standard deviation of the sample mean differences.
![Use the standard deviation values of the two samples to find the standard deviation of the sample mean differences class=](https://us-static.z-dn.net/files/db5/fc9ba0ac9bd315b2807bcdc78965656c.png)
The standard deviation of the sample mean differences is; 0.6898
From online research, the sample size of the session regarding the number of people who will purchase the red box is; N₁ = 45
From online research, the sample size of the session regarding the number of people who will purchase the blue box is; N₂ = 60
Formula for standard deviation of the sample mean differences is;
σm₁ - σm₂ = √[(σ₁²/n₁) + (σ₂²/n₂)]
Thus;
σm₁ - σm₂ = √[(3.868²/45) + (2.933²/60)]
σm₁ - σm₂ = 0.6898
Read more about standard deviation at; https://brainly.com/question/475676
#SPJ1