Question

1.Are men smarter than women at Private Universities in the United States? A study was conducted, randomly selecting 400 men, and 400 women from different Private Universities across the US, and asking for their GPAs. What is the population of this study?

All students enrolled at Private Universities in the world

All students enrolled at Universities in the US

Female students enrolled at Private Universities in the US

All students enrolled at Private Universities in the US

unanswered

2.Match each of the example experiments to the type of experimental design

A study was conducted to determine if rats gain weight after experiencing different levels of exercise. Researchers used 25 rats, for four different levels of exercise, plus a control group. Rats were randomly assigned to each group until there were five rats per group.

Some people try to counteract the presence of alcohol with caffeine in regards to reaction time. To test this, reaction times were measured when subjects were exposed to one of the two levels of alcohol (no alcohol, or yes alcohol), and one of the three different levels of caffeine ( 25 mg, 50 mg, 75 mg).  

It is thought that different levels of mercury exposure can decrease activeness in mice. Since some mice might not be as active due to their genetics, the litter from which the mice came from was used in the study as well. Each mouse was exposed to a level of mercury independently and at random.     

Select an option A. Factorial Design B. Completely Randomized Design c.Completely Randomized Block Design   

3.Which type of bait catches the largest fish? A study was conducted using 3 different baits (worms, corn, and plastic lures), and the average weight of the fish caught was measured. How many treatments are there?

4.Whcih of the following are true about sample statistics? (Choose all that apply)

Are always known

Are never known

Are usually represented by Greek letters

Are calculated from an entire population

Are calculated from a portion of the population

Answer 1

1 )

Population represent the entire group in which we selected the sample to conduct our study or experiment . So the result of the sample will also effect the population. So here the population is ,

● All students enrolled at private universities in the united test .

2 )

◆ The first experiment which is for rats , 25 rats are grouped to rats of five and a control group also then the experiment units are divided. So these experiment study is

C) Completely randomized block design

◆ The second one has dependent variable with factors effected more than one .In this the dependent variable depend on alcohol and caffeine and the study is done with different levels of alcohol and caffeine .So the experiment design is ,

A) Factorial design

◆ Third experiment says about the different level of mercury exposure effect on activeness . Here each mice is exposed to every level of mercury and effect is studied then the experimental design here is given

B) Completely randomized design .

3 )

In this experiment study the variable which we have to measure , that is the weight of the fish caught is calculated for different type of baits .And also there are three different type of bait is given and hence the result is subjected to those 3 baits then the number of treatment is also three

Answer : 3

4 )

Sample statistics is the statistical measure we get from the part of the population .In this the values are calculated for some part of the population not for the population but this result is also true for the same population . The population measures are denoted by the Greek letters like , and generally these values are unknown because it is infeasible to measure the values for the entire population .So the answers are ,

Are always known

Are calculated from a portion of the population .