BUS 205 - Ch 1 and 2 LearnSmart Assignment

Which of the following features is an advantage that the frequency polygon has over the histogram?

It can directly compare two or more frequency distributions.

What information is shown on the horizontal axis of a bar chart?

The qualitative class labels.

Which of the following operations is true regarding relative frequency distributions?

The relative frequency is found by dividing the class frequencies by the total number of observations.

The mode of a set of data is____________.

the value or values that occur most often

A relative frequency distribution shows:

the fraction or percentage of observations in each class interval

Identify all of the following items which are qualitative variables.

- A person's favorite food type. - The colors in a package of M&M's. - The species of trees in a park.

Which of the following are characteristics of bar charts?

- Bar charts are used for qualitative data - Plotted rectangles should be the same width. - There should be gaps between bars.

Which of the following is an advantage of a frequency polygon over a histogram?

It allows comparing directly two or more frequency distributions.

Which of the following is an advantage of a cumulative frequency polygon over a histogram or frequency polygon?

It can show the total number of observations less than a particular class' upper limit.

Which one of the following is not a characteristic of a frequency distribution?

It summarizes qualitative data.

A frequency polygon shows the shape of a distribution and is similar to:

a histogram

Which of the following variables is recorded at the ratio level of measurement?

Salaries of business school graduates.

Which one of the following is true about pie charts?

The size of a slice should represent the relative frequency or percentage.

Which of the following best describes the role of a statistician in working with data?

The statistician should strive to present his analysis with clarity, honesty, and integrity.

Which of the following is a feature of a relative frequency distribution?

The sum of the relative frequencies must be one (assuming no rounding errors).

To divide data with a high value of H and a low value of L into k classes, the class interval must be:

at least (H-L)/k

In a frequency polygon the points are plotted at the intersection of the class frequencies and the:

class midpoints

The value shown on the vertical axis of a cumulative frequency polygon for a particular class is found by:

counting the number of observations less than the upper limit of the class

In using the "2 to the k rule" to determine the number of classes for a frequency distribution, what is the meaning of the variable k?

k is the smallest number of classes such that 2^k is greater than the number of observations.

A useful way to determine the number of classes (k) in a frequency distribution of n items is the "2 to the k rule". Which of the following correctly describes this rule?

k is the smallest number such that 2^k > n.

Suppose a frequency distribution has the following consecutive classes: $20 up to $30 $30 up to $40 $40 up to $50 What is the class midpoint for the first class?

$25

Identify which one of the following is a continuous quantitative variable.

The average weight of apples in a box at the market.

Which of the following features is not part of a histogram?

The frequency of occurrence of a nominal variable.

What is the final step in creating a frequency distribution?

Count the number of observations in each class.

Identify all of the following items which are quantitative variables.

- The weight of a Siamese cat. - The miles per gallon for a particular model of car.

Which of the following are properties of ratio-level data?

- The zero point of the data is meaningful. - It has all the properties of interval-level data. - The ratio between two measures is meaningful.

Which of the following are characteristics of raw data?

- When the data is in its original form it is referred to as raw data - Raw data can be either qualitative or quantitative

Regarding frequency tables and frequency distributions, which of the following are true?

- Both use mutually exclusive classes. - Only frequency tables use qualitative data.

Which of the following are examples of descriptive statistics?

- Calculating summary measures of the prices of houses sold in Las Vegas in January. - Creating a pie chart to show majors of students in your business statistics class.

Which of the following are example of inferential statistics?

- Estimating the average weight in a box of apples by measuring the weight of five apples. - Counting the blue candies in a package of M&M's as a way to estimate the proportion of blue candies in all packages.

Which of the following would useful to represent as a frequency table?

- Gender of students in a business statistics course. - Majors of students in a business statistics course. - State of residence of students in a business statistics course.

Which of the following are attributes of a discrete quantitative variable?

- It can assume only certain values within a range. - It can be used to count items. - There are gaps between the values of this variable.

Which of the following are attributes of a continuous quantitative variable?

- It is typically the result of measuring something. - It can take on any value within a range of values. - There are no required gaps between values.

Which of the following are characteristics of frequency distributions?

- It provides the tally for each class. - Use classes and frequencies to organize data - Organize raw data

Which three of the following are not proper and ethical activities for a statistician in working with data?

- Remove outliers that bias the data too far in one direction. - Report only those statistics that support his conclusions. - Use samples that represent only a desired part of a population.

Which of the following are examples of how organizations use statistics?

- Retailers use product purchase data to manage the distribution of products and make marketing and sales decisions. - Google uses search engine data records to prioritize results for future searches.

Which of the following are reasons to study statistics? Select all that apply.

- Statistical knowledge is needed to understand the world and be conversant in your career. - Data is collected everywhere, and statistics is needed to translate that data into useful information.- Statistics are used to make personal and professional decisions

Which three of the following are samples in the statistical sense?

- Ten apples selected from a grocery store bin containing 100 apples. - Six randomly chosen books from the library. - Every eighth person on the class roster.

Which of the following are discrete variables?

- The number of cars for sale on a used car lot. - The number of customers using an ATM on a given day.

Which of the following can be observed from a histogram?

- The spread of the data. - The shape of the distribution. - The approximate number of observations.

Which of the following practices are commonly used in setting class limits for a frequency distribution?

- rounding the class size up - placing "excess" interval width equally in the two tails of the distribution

Place the following steps used in constructing a frequency distribution into correct order.

1. Decide on the number of classes 2. Determine class width. 3. Set individual class limits. 4. Tally the number of observations in each class.

Suppose you are trying to summarize a data set with a maximum value of 70 and a minimum value of 1. If you have decided to use seven classes, which one of the following would be a reasonable class interval?

10 Reason: (70-1)/7=9.86, round up to 10

Given below are the data for blood types: A B B AB O O O B AB B A B 0 O O A O A A 0 A B B 0 AB Which is the frequency for blood type AB?

3

Which of the following best describes a frequency table?

A grouping of qualitative data into classes showing the number of observations in each class.

Which of the following variables is recorded at the interval level of measurement?

A man's shoe size.

Which of the following is the best definition of a statistical sample?

A portion, or part of the population of interest.

Which of the following is not a useful practice in setting individual class limits for a frequency distribution?

Excluding outliers that cause the interval to be too wide.

Which one of the following is a population in the statistical sense?

All of the automobiles sold in Canada in 2016.

Regarding frequency tables and frequency distributions, which one of the following is true?

Both show the number of observations in each class.

Which of the following represents data recorded at the nominal level?

Brand of newly purchased TV

Which of the following is the best definition of "class midpoint"?

Halfway between the lower or upper limits of two consecutive classes.

What is inferential statistics?

Methods of estimating a property of a population based on a sample.

What is descriptive statistics?

Methods of organizing, summarizing, and presenting data in an informative way.

The __________ of a set of data is the value or values that occur most often.

Mode

Match the following levels of data to the description of the observations. Instructions Nominal Ordinal Interval Ratio The types of fruit in a grocery store. Shoe sizes. Stock prices. Movie ratings.

Nominal: The types of fruit in a grocery store. Ordinal: Movie ratings. Interval: Shoe sizes. Ratio: Stock prices.

The nominal level of data describes what type of information?

Observations of a quantitive variable that can only be classified and counted.

What level of data is represented by the fire risk (Low, Moderate, High or Severe) today in Arapahoe National Forest?

Ordinal

Which one of the following is true regarding raw data?

Raw data are simply a listing of data before summarizing it.

Which of the following best describes interval-level data?

The distance between values is a known unit of measure.

Which of the following is the best definition of a statistical population?

The entire set of individuals, objects or measurements of interest.

A business statistics course has 2 accounting majors, 4 finance majors, 6 marketing majors, and 8 insurance majors. Which one of the following is true if a pie chart was constructed to depict majors of students?

The marketing slice would be three times as big as the accounting slice.