Making Inferences in Statistics

A book store took a random survey of customers about their favorite book genre. The table shows the number of customers who selected each genre. Based on the information in the table, which inference about the favorite genre of all the customers appears to be valid?

• They are certain to select Romance or Young Adult

• They are less likely to select Sci-Fi than Horror, Non-Fiction or History

• They are more likely to select Romance than Sci-Fi, Horror, and History

• They are certain to select any genre other than History

Tags

inferences

teks 7.12B

tables

Petunia conducted a random survey of students to determine the favorite genre of music of 50 students. The results are shown in the bar graph. Based on the information in the graph, which inference about the students is valid?

• Girls like country music more than boys like rap music

• More girls than boys like rock music

• Boys like country music more than rock music

• Boys like rock music more than girls like rap music

Tags

inferences

bar graph

teks 7.12C

A survey was taken at a school of 30 students favorite food. The circle graph shows the number of students who selected each. Based on the information in the graph, which inference about the favorite food of all students appears to be valid?

• It is certain that a student will choose Pizza

• It is less likely that a student will choose Pasta or Hamburgers over Pizza

• It is certain that a student will NOT choose Pasta

• It is more likely that a student will choose Pizza over Hamburgers, Pasta, or Other combined

Tags

inferences

teks 7.12B

circle graph

pie chart

A random survey was conducted at an office about the workers favorite office supply. The results are shown in the table below. Based on the information in the table, which inference about favorite office supply of all the workers appears to be valid?

• It is certain that an office worker will NOT choose Tape as their favorite office supply

• It is certain that an office worker will choose Paper as their favorite office supply

• It is more likely that an office worker will choose Pens, Staplers, or Paper Clips over Paper

• More people like Staplers or Paper Clips over Pens/Pencils

Tags

inferences

teks 7.12B

tables

A representative sample of 80 customers in a clothing store was surveyed about how they paid for their purchases. The table shows the responses. Based on the results, which of the following are valid inferences. Select all that apply.

• Tomorrow, 8 out of the first 80 customers will for sure pay with a gift card.

• In a group of 40 customers, it is expected that about 10 will pay with cash.

• About 0.3, or 30%, of all the store's customers will pay with a credit card.

• A sample of 100 customers would provide less reliable data.

The manager of a music store surveyed a random sample of customer who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music. Based on the information in the table, which inference about the favorite type of music of all the customers who shop in the music store appears to be valid?

• They are certain to select rock or pop music.

• They are less likely to select country or rap music than rock music.

• They are more likely to select country music than jazz, classical, or rap music.

• They are certain to select any type of music other than jazz music.

Sampling can be used to make an inference (or educated guess) about a population.

• True

• False

The table shows the monthly sales at a pizza parlor for a 6-month period. Which statement is the best inference that can be made from the table?

• January had the lowest sales.

• The period with the greatest increase in monthly sales was from May to June.

• Sales for July will be greater than $10,000.

• The sales will drop over the next 2-month period.

A representative sample of 80 customers in a clothing store was surveyed about how they paid for their purchases. The table shows the responses. Based on the results, which of the following are valid inferences. Select two answer choices.

• Tomorrow, 8 out of the first 80 customers will for sure pay with a gift card.

• In a group of 40 customers, it is expected that about 10 will pay with cash.

• About 30% of all the store's customers will pay with a credit card.

• A sample of 100 customers would provide less reliable data.

The manager of a music store surveyed a random sample of customer who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music. Based on the information in the table, which inference about the favorite type of music of all the customers who shop in the music store appears to be valid?

• They are certain to select rock or pop music.

• They are less likely to select country or rap music than rock music.

• They are more likely to select country music than jazz, classical, or rap music.

• They are certain to select any type of music other than jazz music.