Unit 1 & 2

Organizing the data into a frequency distribution can make patterns within the data more evident It can be easier to identify patterns of a data set... distribution

What are some benefits of representing data sets using frequency distributions?... 2 parts

Stem and leaf plots contain original data values where histograms do not Histograms easily organize data of all sizes were stem and leaf plants do not

What is an advantage of using a stem-and-leaf plot instead of a histogram? What is a disadvantage?

What is the definition of mean - The sum of the data entries divided by the number of entries Choose a data set whose mean is not equal to a value in the set - 4,4,6,6

Construct the described data set. The entries in a data set cannot all be the same. The mean is not representative of a typical number in the data set

Pic

Construct the described data set. The entries in a data set cannot all be the same. The mean, and median are the same in the data set is bimodal

No, because it does not lead the respondent to any particular answer

Determine if the survey question is biased. If the... How often do you eat ice cream during an average month?

The question is biased. The wording "how do you think eating ice cream affects your health?" Would be better

Determine if the survey question is biased. If the... Why is eating ice cream bad for you?

The shape of the distribution is approximately uniform, because the bars are approximately the same height

Determine whether the approximate shape of the distribution in the histogram shown is symmetric, uniform, skewed left, skewed, right, or none of these

The shape of the distribution is symmetric, but not uniform, because a vertical line can be drawn down the middle, creating 2/2 that look approximately the same

Determine whether the approximate shape of the distribution in the histogram shown is symmetric, uniform, skewed left, skewed, right, or none of these

Population, because it is a collection of ages for all people in the apartment building

Determine whether the data set is a population or a sample. Explain your reasoning The age of each resident in an apartment building

Population, because it is a collection of the number of children for all households in the town

Determine whether the data set is a population or a sample. Explain your reasoning. The number of children for each household in a town

This statement is false. All quantitative data set medians.

Determine whether the following statement is true or false. If it is false, rewrite it as a true statement Some quantitative data sets do not have medians

The statement is true

Determine whether the following statement is true or false. If it is false, rewrite it as a true statement. The mean is the measure of the central tendency, most likely to be affected by an outlier

The statement is false. A placebo is a fake treatment

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

False. Data are the ordinal level can be qualitative or quantitative

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

False. A statistic is a measure that describes a sample characteristic

Determine whether the statement is true or false. If it is false, rewrite it as a true statement. A statistic is a measure that describe a population characteristic

The study is an experiment, because it applies a treatment to the subjects

Determine whether the study is an observational study or an experiment. Explain. A research study compared the memory retention of subjects when a learning activity was followed by a brief period of wakeful rest and when a learning activity was followed by a brief period of distraction

Is the value a parameter or a​ statistic: statistic

Determine whether the underlined value is a parameter or a statistic In a national survey of high school students (grades 9 to 12), 25 % of respondents reported that someone had offered , sold , or given them an illegal drug on school property

The variable is qualitative because a favorite rock group describe an attribute or characteristic

Determine whether the variable is qualitative or quantitative. Explain Favorite rock group

The variable is qualitative because types are attributes or labels

Determine whether the variable is qualitative or quantitative. Explain Favorite types of music

The variable is qualitative because street name describes an attribute or characteristic.

Determine whether the variable is qualitative or quantitative. Explain Last airline on which you've flown Or: street name of address

The variable is qualitative because responses are attributes or labels

Determine whether the variable is qualitative or quantitative. Explain Responses on an opinion poll

The range is found by subtracting the minimum data entry from the maximum data entry It is easy to compute It uses only two entries from the data set

Explain how to find the range of a data set. What is an advantage of using the range as a measure of variation? What is a disadvantage?

Population: all law firms in the country Sample: the law firms that were surveyed Describe the sample data set: the average hourly billing rate for partners of 174..

Identify the population and the sample. Describe the sample data set. A survey of 174 law firms in a country found that the average hourly billing rate for partners was $617

Part one - simple random sampling was used Part two -Individuals may have not been available when the researchers were calling -Telephone sampling only.. - individuals may have refused to participate in the sample

Identify the sampling technique used, and discuss potential sources of bias (if any) In 1965, researchers used random digit dialing to call 1300 people and ask what obstacles kept

Part one Cluster sampling is used, since the disaster is divided into grids , and some Part two Certain grids Certain grids

Identify the sampling technique used, and discuss potential sources of bias (if any). Explain After a tornado, a disaster area is divided into 150 equal grids....

Both plots can be used to identify unusual data values Both plots can be used to determine specific data entries Both plots show how data are distributed.

In terms of displaying data, how is a stem and leaf plot similar to adopt hot

The list of books that your friend read for school for the past five months is shown below Spring Fever Kiss The Dead The Forgotten Private London Threat Vector Identify the level of measurement of the data set . Explain your reasoning .

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

2.2

The medal counts for five countries are the recent international sports

Determine whether the underlined number describes a population parameter or a sample statistic. Explain your reasoning A survey of 2208 adults in a country found that 79% think that militant territorist are a major threat to the well-being of their country

The number is a sample statistic because it describes the people in a sample, which is a subset of all the people in the country

Part one Convenience sampling is used.... Part two The sample only consists of members.. Because of the personal nature of the question...

Identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Assume the population of interest is the student body... Questioning students as they leave a university library, a researcher asks 373 students about their eating habits

Part one Systematic sampling Part two The wording If there is a regular

Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain Every eighth person entering a mall..

2.2

A back-to-back stem-and-leaf plot compares two data sets by using the same stems for each data set

The data set is a sample because the collection of 12 people is a subset of the 58 people who escaped a burning building

Determine whether the data set is a population or a sample. Explain your reasoning The carbon monoxide levels of 12 of 58 people who escaped a burning building

The statement is false. A true statement is "for data at the interval level, you can calculate meaningful differences between data entries"

Determine whether the statement is true or false. If it is false, rewrite it as a true statement For data at the interval level, you cannot calculate meaningful differences between data entries

False. More types of calculations...

Determine whether the statement is true or false. If it is false, rewrite it as a true statement More types of calculations can be performed with data at the nominal level than with data at the interval level

2.2

Display the accompanying data in a dot plot

Question 9 2.2

Give three observations that can

The bars are position in order of decreasing height with the tallest bar on the left

How is a Pareto chart different from a standard bar graph?

Nominal Ordinal

Name each level of measurement for which data can be qualitative Select all the levels of measurement for which data can be qualitative PAY ATTENTION

Ratio Ordinal Interval

Name each level of measurement for which data can be quantitative Select all the levels of measurement for which data can be quantitative PAY ATTENTION

1st part: Stem and leaf plots Dot plots Time series plots Scatter plots Histograms 2nd: Bar graphs Pareto charts Pie charts

Name some ways to display quantitative data graphically. Name some ways to display qualitative data graphically

2.1

The accompanying data set list the numbers of children of the world leaders

2.1

The admissions department for a college is asked to recommend a minimum SAT scores

2.2

The data set shows the ages of all participants

2.1

Use the frequency histogram

In an experiment, a treatment is applied to part...

What is the difference between an observational study an experiment?

RandInt(1,950,9)

What technology format could be used to generate nine random numbers between 1 and 950

2.1

Construct a frequency distribution for the given data set using 6 classes

2.2

Display the data to the right in a Pareto chart

A sample is a subset of a population

How is a sample related to a population

Ratio. The data can be ordered...

Look at pic The lengths (in centimeters) of 22 ford automobiles are listed. Identify the level of measurement of the data set. Explain your reasoning *lots of numbers* What is the data set's level of measurement? Explain your reasoning.

2.2

Match the plot with a possible description of the sample

Paper 2.1

Use the given minimum and maximum data entries, and the number of classes, to find the class width, the lower class limits, and the upper class limits

2.1

Use the ogive to approximate

The units of variance are squared. Its units are meaningless.

Why is the standard deviation used more frequently than the variance?

If the number of classes in a frequency distribution is not between 5 and 20, it may be difficult to detect any patterns

Why should the number of classes in a frequency distribution be between 5 and 20

2.2

Display the accompanying data in a stem-and-leaf plot.

The variable is quantitative because carrying capacities are numerical measurements

Determine whether the variable is qualitative or quantitative. Explain Carrying capacities of flatbed trucks

(a) the experimental units are the 500 girls ages 13 to 17 who have acne. The treatment is the new cream used to treat acne (b) only girls ages 13 through 17... (c) for the experiment to be double-blind, neither the subjects nor the company would know whether the subjects are receiving the acne cream or the placebo

A company wants to test the effectiveness of a new acne cream. The company recruits 500 girls ages 13 to 17...

2.2

A misleading graph

(a) the angle makes it appear the 3rd quarter... (B) answer on picture

A misleading graph is a statistical graph that is not drawn appropriately. This type of graph can misrepresent data and lead to false conclusions

(a) the large gap... (B) shown in pic

A misleading graph is a statistical graph that is not drawn appropriately. This type of graph can misrepresent data and lead to false conclusions.

The motorcycle's fuel efficiency is greater than the fuel efficiency for 90% of vehicles in its class

A motorcycle's fuel efficiency represents the ninth DeSio of vehicles, and it's class. Make an observation about the motorcycles for efficiency.

Hw 1.3 question 9 paper

A researcher wants to study the effects of sleep deprivation on motor skills. Nine people....

Go to paper hw 1.1

A survey of 1021 U.S. adults found that 44.8 % have a favorable view of Cuba. Identify the population and the sample. Describe the sample data set

(a) has a standard deviation of 24 and B has a standard deviation of 16 because the data in a have more variability

Both data sets have a mean of 245. One has a standard deviation of 16, and the other has a standard deviation of 24. Which data set has which deviation

Determine whether the underlined number describes a population parameter or a sample statistic. Explain your reasoning. Sixty - six of the 93 passengers aboard an airship survived an explosion

Choose the correct statement below: The number is a population parameter because it is a numerical description of all of the passengers that survived

2.1

Construct a frequency, distribution in a frequency, histogram for the data set using the indicated number of classes

(a) happiness level (scale..): ordinal (b) marital status: nominal (c) height: ratio (d) year of birth: interval

The following appear on a physician'a intake form. Identify... (a) happiness level (scale..) *scale? Always pick ordinal* (b) marital status or allergies (c) height or weight (d) year of birth or temperature

Question 14 on 1.2 Identify the level of measurement of the data listed on the horizontal.... - interval Identify the level of measurement of the data listed on the vertical.... - ratio Kinda hard just pick ratio for both if uncertain

The graph to the right shows the annual number of fatalities in thousands for certain years. Identify the level of measurement of the data listed on the horizontal and vertical axis...

Question 13 on 1.2 Choose these answers if graph is going up line a zig zag Identify the level of measurement of the data listed on the horizontal.... - ratio Identify the level of measurement of the data listed on the vertical.... - ratio Kinda hard just pick ratio for both

The growth to the right shows the number of coyotes with certain average annual rainfall amounts (in inches). Identify the level of measurement of the data listed on the horizontal and vertical axes in the graph Number line (zig zag going up) Question 13 on 1.2

Part one: An open question allows for new solutions to be Introduced An open... Part two It is difficult It is difficult The form... Part three It is easy It is possible Part four The form Closed questions May not

Two types of survey questions are open questions and closed questions. An open...

2.2

Use a time series chart to display the data shown in the table available below

Population: the income of home owners Description of the sample: the incomes of home owners who have a garage

Use the Venn diagram to identify the population and the sample

2.1

Use the accompanying data set of pulse rates of all students in a class

Paper 2.1

Use the frequency distribution shown below to construct..

Paper 2.1

Use the frequency polygon to identify..

Hw 1.3 paper

Use the row of numbers shown below to generate 12 random numbers...

2.2

Use the scatterplot to display the data shown in the table available below

2.2

Use the stem-and-leaf plot to list the actual data entries

A parameter is a numerical description of a population characteristic. A statistic is a numerical description of a sample characteristic

What is the difference between a parameter and a statistic

With a random sample, each individual...

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

Class limits are the least and greatest numbers that can belong to the class. Class boundaries are the numbers that separate classes without forming gaps between them. For integer​ data, the corresponding class limits and class boundaries differ by 0.5.

What is the difference between class limits and class boundaries

Company B, because data values that lie within one standard deviation from the mean are not considered unusualf

You are applying for a job at two companies. Company eight offer starting salaries with u=25,000 and o=3000. Company B offers starting salaries with U-25000 and o=7000. From which company are you more likely to get an offer of 31,000 or more?

2.1

You work at a bank in our ass to recommend the amount of cash