UNIT 2

Determine whether the following statement is true or false. The shape of the distribution shown is best classified as skewed left.

false The given graph is skewed in the direction of the tail.​ Thus, the graph is classified as skewed right.

are the categories by which data are grouped.

CLASSES

An experiment was conducted in which two fair dice were thrown 100 times. The sum of the pips showing on the dice was then recorded. The following frequency histogram gives the results. Use the histogram to complete parts​ a-e.

​(a) Which outcome was the most frequent outcome of the​ experiment?

What is a bar​ graph? What is a Pareto​ chart? What is a bar​ graph? What is a Pareto​ chart?

A bar graph is a horizontal or vertical representation of the frequency or relative frequency of the categories. The height of each rectangle represents the​ category's frequency or relative frequency. A Pareto chart is a bar graph whose bars are drawn in decreasing order of frequency or relative frequency.

A frequency distribution lists the ___________ of occurrences of each category of data. A relative frequency distribution lists the ___________________of occurrences of each category of data.

A frequency distribution lists the number of occurrences of each category of data. A relative frequency distribution lists the proportion of occurrences of each category of data.

In a relative frequency​ distribution, what should the relative frequencies add up​ to? Select the correct choice​ and, if​ necessary, fill in the answer box to complete your choice.

A relative frequency distribution lists each category of data together with the relative frequency. The frequency column sums to the total number of observations. The relative frequency is the proportion​ (or percent) of observations within a category. relative frequencies Add up to 1

An airline offers discounted flights from Atlanta to five American cities. Below is a frequency distribution of the number of tickets purchased for each location based on a random sample of purchased tickets. Complete parts ​(a) through ​(f). (f) A local news broadcast reported that 7.1​% of tickets purchased from the airline are for flights to San Diego. What is wrong with this​ statement?

No level of confidence is provided along with the estimate.

is the difference between consecutive lower class limits.

class width

Determine whether the following statement is true or false. The shape of the distribution shown is best classified as uniform.

false All the bars in a uniform distribution are approximately the same height while this graph has the highest frequency occurring in the middle and the frequencies tail off to the left and right of the middle in a symmetric way.

A national survey asked​ people, "How often do you eat out for​ dinner, instead of at​ home?" The frequencies were as follows. Complete parts ​(a) through ​(g). ​(a) Construct a relative frequency distribution of the data. (g) Suppose a person claims​ that, ​"4.1​% of all people in the nation always eat​ out." Is this a descriptive or inferential​ statement?

inferential

is the smallest value within the class

lower class

The following data represent the percent of owners of an electronic device that plan to purchase a replacement device within the next 12 months based on a survey of 1100 adults in a certain country. Complete parts ​(a) through ​(c). LOADING... Click the icon to view the bar chart of the data. If the results of the survey were claimed to indicate that 7.8​% of adults in this country who own digital cameras plan to replace their camera in the next 12​ months, would you say this statement is descriptive or​ inferential? Why?

n1 = n x percent / 100% n= 250,000,000 * 14.8 /100% The statement is​ inferential, because the survey reports on a sample of the​ country's population. This claim requires an inference to the population.

The pie chart below depicts the beverage size customers choose while at a fast food restaurant. Complete parts ​(a) through ​(c). A pie chart titled "Most popular beverage sizes at a restaurant" contains four sectors, each labeled with a beverage size and a percentage as follows: Large, 32%; XL, 13%; Small, 44%; Medium, 11%. The sectors' relative sizes correspond with the percentage labels. Most popular beverage sizes at a restaurant Large 32% XL 13% Small 44% Medium 11% What is the most popular​ size? What percentage of customers choose this​ size? What is the least popular​ size? What percentage of customers choose this​ size? What percent of customers choose a large​-sized ​beverage? What percent of customers choose a large​-sized ​beverage?

small 44% medium 11% 32%

is the largest value within the class.

upper class