Homework 1.3-1.4 Statistics

Determine whether the given value is from a discrete or continuous data set. When a car is randomly​ selected, it is found to have a weight of 1889.2 kg.

A continuous data set because there are infinitely many possible values and those values cannot be counted.

How do a parameter and a statistic differ?

A parameter is a numerical measurement describing some characteristic of a​ population, whereas a statistic is a numerical measurement describing some characteristic of a sample.

Which of the following is associated with a​ parameter?

Data that were obtained from an entire population

Determine whether the value is from a discrete or continuous data set. Number of coins in a jar is 78

Discrete

Determine whether the given description corresponds to an observational study or an experiment. In a study of 381 men with a particular​ disease, the subjects were photographed daily.

Observational study

Determine which of the four levels of measurement​ (nominal, ordinal,​ interval, ratio) is most appropriate. Monthly rainfall: 2.4 in, 2.6 in, 2.8 in, 3 in, and 3.2 in

Ratio

Determine which of the four levels of measurement​ (nominal, ordinal,​ interval, ratio) is most appropriate for the data below. Types of restaurants left (fast food comma organic food comma sea food comma etc.)

The nominal level of measurement is most appropriate because the data cannot be ordered

Determine which of the four levels of measurement​ (nominal, ordinal,​ interval, ratio) is most appropriate for the data below. People's ages

The ratio level of measurement is most appropriate because the data can be ordered comma differences left parenthesis obtained by subtraction right parenthesis can be found and are meaningful comma and there is a natural starting zero point.

A particular country has 50 total states. If the areas of 40 states are added and the sum is divided by 40​, the result is 213 comma 816 square kilometers. Determine whether this result is a statistic or a parameter.

The result is a statistic because it describes some characteristic of a sample

Determine whether the description below corresponds to an observational study or an experiment. In a study sponsored by a​ company, 10 comma 263 people were asked what contributes most to their anxiety comma and 77 % of the respondents said that it was their partner.

The study is an observational study because the survey subjects were not given any treatment.

Determine if the given value is a statistic or a parameter. The mean height for construction workers is six feet.

The value is a parameter because it is a numerical measurement describing some characteristic of a population.

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

Which sampling method divides the population up into​ sections, randomly selects some of those​ sections, then chooses all the members from the selected sections to​ study?

cluster

a radio asks its listeners to call in their opinion regarding the format of the morning show. Which type of sampling is​ used?

convenience

Which of the following would be classified as categorical data?

hair color

Which of the following consists of discrete data?

number of suitcases on a plane

A study is conducted to measure​ children's growth rates without any treatment applied to the children. What best classifies this​ study?

observational study

In a poll conducted by a certain research​ center, 1068 adults were called after their telephone numbers were randomly generated by a​ computer, and 61 % were able to correctly identify the attorney general. Which type of sampling did the research center​ use?

random sampling

Which sampling method subdivides the population into categories sharing similar characteristics and then selects a sample from each​ subdivision?

stratified

A man is selected by a marketing company to participate in a paid focus group. The company says that the man was selected because every 10 comma 000 th person in the phone number listings was being selected. Which type of sampling did the marketing company​ use?

systematic sampling