An example of cluster sampling is? (note that Rutgers University has 5 campuses)

A.Taking sample of 5 students from each campus of Rutgers University

B.Taking a large sample of students from one of the campuses of Rutgers University

C. Collecting data from all students of College Avenue Campus at Rutgers University

D.None of the above

A recent survey concluded that 80% of pre-school children enjoy eating ice cream."The statement is an example of:

A.Descriptive Statistics

B.Statistical Significance

C.Inferential Statistics

D.Standard Score

For a set of paired data, the variable used to predict the other variable is called

A.the dependent variable (y)

B.the independent variable (X)

C.the non-determination variable

D.the determination variable

E.none of the above

The closer the value of correlation coefficient is to 1,

A.the stronger the relationship.

B.the more evenly the values of dependent variable are distributed.

C.the closer values of dependent and independent variables are to each other.

D.the more certain we are that the samples are representative.

A researcher studied the relationship between the income of individuals and amount of time they exercise a day and found a correlation coefficient of -0.15. This means that?

A.as income goes up, then daily exercise duration goes up.

B.the more time individuals spend for work, then the less time they have for exercise.

C.there is no association between income and exercise duration.

D.income and exercise duration are highly correlated.

As the temperature rises, consumption of fast food increases." This suggests that

A.There is a strong relationship between temperature and fast food consumption.

B.If the temperature drops 30%, consumption of fast food will also decrease by 30%.

C.If the temperature would remain stable, consumption of fast food would stay the same.

D.Fast food restaurants are busier during the summertime.

The correlation between two variables is -0.72 for a sample of 46 observations.What is the coefficient of determination between the two variables?

A.52

B.72%

C.0 .48

D.We cannot determine it because sample size is smaller than 30.

At a large metropolitan area, a coefficient of correlation of 0.75 was found between the number of traffic lights and the number of traffic violation tickets issued by the police.What percent of the total variation in traffic violation tickets is not explained by the relationship between traffic violation tickets and number of traffic lights?

A.56%

B.25%

C.44%

D.Cannot be determined with the given information

E.None of the above

1. The slope of a regression equation is 22, the value where the line intersects the Y axis whenX= 0 is -4. What is the regression equation?

A.X = 4 + 22Y

B.Y = 4 - 22X

C.Y = 4 + 0X

D.Y = -4 + 22X

E.none of the above

The regression equation is Y = 6.5 - 1.8X.For each unit change in X, the change inYis

A.1

B.6.5

C.8.3

D.-1.8

E.none of the above

The following are the number of birth per year per 1,000 population for 20 countries:

34, 24, 10, 15, 22, 15, 17, 22, 10, 17, 25, 32, 15, 20, 31, 18, 37, 12, 15, 18.The mean birth per year per 1,000 population is:

A.22.3

B.19.5

C.22.45

D.None of the above

1. 34, 24, 10, 15, 22, 15, 17, 22, 10, 17, 25, 32, 15, 20, 31, 18, 37, 12, 15, 18.The median birth per year per 1,000 population is:

A.15

B.18

C.22

D.None of the above

It is claimed that elderly people who live in highly polluted areas are more likely to require medical care.Data was collected on 594 elderly and their medical care cost, and a correlation coefficient of 0.82 was found. What does this mean?

A.There is a strong association between the region where elderly population live and their medical cost

B.There is a moderate association between the region where elderly population live and their medical cost

C.There is a strong association between the level of pollution in the regions where elderly population live and their medical cost

D.There is a moderate association between the level of pollution in the regions where elderly population live and their medical cost

1. It is claimed that elderly people who live in highly polluted areas (micrograms per cubic meter) are more likely to require medical care ($).Data was collected on 594 elderly and their medical care cost, and a regression equation of Y = 5200 + 240X was calculated. Select the correct interpretation?

A.For every new region, pollution goes up by 240 micrograms

B.In a region with no pollution, there is $240 medical care cost

C.when pollution is 240 micrograms, medical cost is $5,200.

D.In a region with no pollution, there is $5,200 medical care cost

1. It is claimed that elderly people who live in highly polluted areas (micrograms per cubic meter) are more likely to require medical care ($).Data was collected from 594 elderly and their medical care cost, and a regression equation of Y = 5200 + 240X was calculated.How much is the medical cost when pollution reached 10 micrograms?

1. $6,600.
2. $52,000.
3. $7,600
4. $2,400

The area within two standard deviations of the mean of a normal distribution is about what percent of the total area?

A.68%

B.50%

C.95%

D.Over 99%

E.None of the above

Null and alternative hypotheses are statements about:

A.population parameters.

B.sample parameters

C.sample statistics.

D.it depends - sometimes population parameters and sometimes sample statistics.