Magali and jean-gabriel have been asked to design a study investigating happiness across the lifespan. they decide their study will involve going to the mall and asking people of a variety of ages if they are happy or unhappy. what is the most serious flaw of this design?
a. people will know that they are part of a research study and may decline participation.
b. survey data is not as valid as experimental data.
c. their results will depend on how busy the mall is.
d. they have not defined happiness or how it will be measured.

 d)They have not defined happiness or how it will be measured.

Explanation: A survey is the record that is formed on the basis of through examination and observation of any particular situation or thing. The survey carried out by Magali and Jean has a major flaw because it does not have any certain parameter for measuring the rate of happiness in people present in the mall.

Other options are not appropriate to be a mistake in survey because people will not avoid the participation, the experimental survey data is valid and dependency is not based on population of people in mall.Thus, the correct option is option(d).

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.

answer; /// the statement is false,false,false;