1. A researcher is studying the effects of junk food on the obesity of children. For one month, he gives fast food to 20 children every day, and gives fruits and vegetables to another group of 20 children every day. Health signs are then monitored for both groups. Is the above question an experiment or a survey, and is the collected data statistics or a parameter?

Experiment, statistics

Experiment, parameter

Survey, statistics

Survey, parameter

2.A researcher is studying the effects of junk food on obesity of children. For one month, he gives fast food to 20 children every day, and gives fruits and vegetables to another group of 20 children every day. Health signs are then monitored for both groups. What graph can the researcher use for his research?

Pareto charts

Bar graph

Circle Graphs

Time-series graph

Histogram

Scatter plot

Inferential statistics

can help researchers make conclusions about sample based on population data.

can be used for both qualitative and quantitative data.

requires a large sample size.

involves lengthy process of data analysis.

None of the above

55% of the US households have an annual income of more than $60,000. A sample of 430 households in New Jersey showed that 76% of them have an annual income of more than $60,000.The difference between these two proportions is called the

1. Standard error
2. Error of the estimate
3. Sampling error
4. Margin of error
5. We cannot compare these two proportions

A researcher wants to study the percentage of NY city residents who use public transportation. What is the population?

A. The carefully selected subset of NY city residents.

B. All NY city residents who use city's bus system.

C. All NY city residents who travel to work.

D. All NY city residents

The best method for presenting data that shows the distribution of sub-categories (ie. Different ethnic groups) is:

A.Box-plot

B.Pie chart

C. Line chart

D.Scatter-plot

Examples of methods of dispersion that give us an overall picture of the gap within a data set are (summaries all gaps in one number)

A.Mean and coefficient of skewness.

B.Inter-quartile range (Q3 - Q1), and standard deviation.

C.Mean, and mean deviation.

D.Standard deviation, and correlation coefficient.

E.Mean deviation, and variance.

Which methods we can use to check the normality of a data set?

A.PP-Plot and standard deviation

B.Variance and standard deviation

C.Box-plot and coefficient of skewness

D. Variance and QQ-Plot

E. Scatter plot and stem and leaf display