Summative review 1

Name each level of measurement for which data can be qualitative. • (Nominal, Ordinal, Ratio, and/or Interval)

Nominal, Ordinal

The following shown below is a list of books that your friend read for school for the past five months is A. The Forgotten B. The Racketeer C. Gone Girl D. Threat E. Vector F. Private London • Identify the level of measurement of the data set.

Nominal. The data are categorized using names, labels, or qualities, but the data cannot be ranked or arranged in order.

What is the difference between a parameter and a statistic?

Parameter is a numerical description of a popular characteristic. A statistic is a numerical description of a sample statistic.

. Determine whether the data set is a population or a sample. Explain your reasoning. • The salary of each teacher in a school.

Population, because it is a collection of salaries for all teachers in the school.

Determine whether the data set is a population or a sample. • The number of floors in each building in a city.

Population, because it is a collection of the number of floors for all buildings in the city.

Select all the levels of measurement for which data can be quantitative. • (Nominal, Ordinal, Ratio, and/or Interval)

Ratio, Ordinal, and Interval

Determine whether the data set is a population or a sample. Explain your reasoning. • The heights of half of the students in a class

Sample, because the collection of is a subset of heights of half of the students all students in the class.

6. Determine whether the variable is qualitative or quantitative. Explain your reasoning. • Country of residence Is the variable qualitative or quantitative?

The variable is qualitative because a country of residence describes an attribute or characteristic

. Determine whether the variable is qualitative or quantitative. Explain your reasoning. • Favorite breakfast cereal. Explain.

The variable is qualitative because a favorite cereal describes an attribute or characteristic.

Determine whether the variable is qualitative or quantitative. • Goals scored in a hockey game. Explain your reasoning.

The variable is quantitative because the goals scored is found by measuring or counting.

How is a sample related to a population?

A sample is a subset of a population.

True or False + rewrite true if false. Data at the ratio level cannot be put in order.

FALSE-- Data at the ratio level can be placed in a meaningful order.

True or False + rewrite true if false. Using a systematic sample guarantees that members of each group within a population will be sampled.

FALSE---- Using a stratified sample guarantees that members of each group within a population will be sampled.

Determine whether the statement is true or false. If it is false, rewrite it as a true statement. • Data at the ordinal level are quantitative only.

. Data at the ordinal level can be qualitative or quantitative.

What is the difference between an observational study and an experiment?

. In an experiment, a treatment is applied to part of a population and responses are observed. In an observational study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions.

5 random numbers betwwen 01-99 96082 37725 01149 72167

96,8,23,77,25

What is the difference between a census and a sampling?

A census includes the entire population. A sampling includes only part of the population.

. Determine whether the statement is true or false. If it is false, rewrite it as a true statement. • The method for selecting a stratified sample is to order a population in some way and then select members of the population at regular intervals.

False. The method for selecting a systematic sample is to order a population in some way and then select members of the population at regular intervals.

. Why is a sample used more often than a population?

It is usually impossible to count the entire population.

Determine whether the underlined value is a parameter or a statistic. • A study of 6,076 adults in public rest rooms found that 23% did not wash their hands before exiting.

Statistic

True or False + rewrite true if false. It is possible for the census bureau to obtain all the census data about the population of the united states

TRUE

A quality-control manager randomly selects 100 vinegar bottles that were filled on November 19 to assess the calibration of the filling machine. • What is the population in the study? What is the sample in the study?

The population is all vinegar bottles produced on November 19. The sample is the 100 vinegar bottles selected

2. Determine whether the following statement is true or false. If it is false, rewrite it as a true statement. • A placebo is an actual treatment.

The statement is false. A placebo is a fake treatment.

. Determine whether the following statement is true or false. If it is false, rewrite it as a true statement. • A sample statistic will not change from sample to sample.

The statement is false. A sample statistic can change from sample to sample.

Determine whether the following statement is true or false. • A double-blind experiment is used to increase the placebo effect.

The statement is false. Double blinding is used to decrease the placebo effect

. What is the difference between a random sample and a simple random sample?

With a random sample, each individual has the same chance of being selected. With a simple random sample, all samples of the same size have the same chance of being selected.