The answer to your question is
508
I believe the answer is: <span>Although he did not cause the stock market crash, Hoover deserves criticism for his inadequate response to it.
Right after the market crash, President hoover stated that the crash is just a part of recession and the economy would bounced back on itself without having to change any policies in the economy, which lead to the criticism from many economists.</span><span />
1. Corresponding Author: Dr. Rifat Nawreen Islam Assistant Professor
Depertment of Forensic Medicine
Medical College for Woman and Hospital, Uttara, Dhaka
2. Dr. Noor-E-Tabassum
Associate Professor
Depertment of Pharmacology
Medical College for Woman and Hospital, Uttara, Dhaka
3. Dr. A K M Safiuzzaman MBBS MCPS Lecturer, Dhaka Medical College, Dhaka
4. Professor Md. Monowarul Islam Sarker MBBS MCPS Professor & Head of Forensic Medicine Department Medical College for Women, Uttara, Dhaka
Answer:
A control should have been included in the investigation
Explanation:
It is impossible for the student to interpret a correct conclusion about his experiment, without adding a control treatment where he can really compare the differences between the variables.
Control treatment is an element of research that receives all factors, except the variable being tested. The control serves to make comparisons with the other treatments, allowing to observe the exact difference between a system where the variable was tested and the system where it was not.
In the case of the question above, it would have been necessary for the student to have placed a cart on a ramp of normal height and without sandpaper. That way he could compare the speed between this cart and the carts on the other ramps, thus having a correct result.