Sociologists want to test whether the number of homeless people in a particular urban area is increasing. in 2010, the average number of homeless people per day who sought shelter was 42.3 (σ = 6.2). data from the current year reveal that the mean number of people seeking shelter per day is 45.3. what is the correct statistical test?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.