Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated
guess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better -yellow or blue- and uses their responses to determine if his educated guess was correct. What is missing from Yasir’s scientific investigation? A testable hypothesis that is based on research
An experiment that directly tests the hypothesis
Variables to be tested by an experiment Research on the topic to see what others have learned
Variables to be tested by an experiment Research on the topic to see what others have learned
Explanation:
Given that Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated guess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better -yellow or blue- and uses their responses to determine if his educated guess was correct.
The problem in his study is he really did not check the fact but depended on the reply of the people what the like
Sleep is different form liking a colour
Thus he should have recorded the paint colour and hours of sleep for a sample of reasonable size to test his hypothesis.
Variables to be tested by an experiment Research on the topic to see what others have learned is right answer
Yasir wanted to study the relationship between sleep and room color. So he has done all the background study required on the topic and arrived at a hypothesis that people fall asleep more rapidly in a room painted in blue color than in a room painted yellow. Yasir inquired several people which color they like better -yellow or blue- and used their feedback to decide whether his hypothesis was correct. There was no experiment conducted to observe the effect of a room color on sleep and the variables to be tested in the experiment were not properly identified.
<span>Option-C: They react mainly by substitution.
Explanation: Alkene doesn't give substitution reactions because they are non polar in nature. The double bond in alkene is responsible for Electrophillic Addition reactions as it electron rich and nucleophilic in nature. Reaction of Alkene is given below,</span>
