Making Inferences from Samples about Population

Several students were surveyed about their favorite drinks. 22 said orange soda, 34 Pepsi, 40 coke, and 29 grape soda. Predict how many students will like coke if 500 students are surveyed?

• 12.5

• 40

• 160

• 167

The election committee for a candidate running for mayor randomly selects 200 men to complete an online survey. The men are asked to identify which mayoral candidate they are most likely to vote for in the upcoming election. Of the 200 men polled, 42 men chose not to answer and 52% indicated they would vote for candidate Ray. Based on these results, what can be inferred about the outcome of the election?

• Ray cannot possible win the election

• 42 percent of the citizens will not vote.

• Ray is the most popular candidate among men voters

• 48 percent of men plan to vote for a candidate other than Ray.

Zoie completes a report by asking 70 students across campus. She found that 48% of CIAA students do not wash their hands after using the bathroom. What is the population of her survey?

• the bathroom

• CIAA students

• 48% of students

Jon finds a box of 350 postcards. He selects a random sample of 75 postcards and finds that 27 already have a stamp on them. Predict the total number of postcards in the box with stamps on them.

• 9,450 postcards

• 126 postcards

• 13 postcards

• 5 postcards

The dot plots show how long it took students in Mr. Chauncey's two science classes to finish their science homework last night. Find the average to make an inference about the data.

• The 1st period mean is 35. The 2nd period mean is 38.75. On average, it took students in the 1st period class slightly longer to finish their homework than it did the students in the 2nd period class.

• The 1st period mean is 38.75. The 2nd period mean is 35. On average, it took students in the 1st period class slightly longer to finish their homework than it did the students in the 2nd period class.

• The 1st period mean is 35. The 2nd period mean is 38.75. On average, it took students in the 2nd period class slightly longer to finish their homework than it did the students in the 1st period class.

• The 1st period mean is 38.75. The 2nd period mean is 35. On average, it took students in the 2nd period class slightly longer to finish their homework than it did the students in the 1st period class.

The dot plots show the heights of seventh graders in two classes. Which statement is best supported by these data?

• The distributions of the data of both classes are approximately symmetrical

• The median height of the students in Mr. Carter's class is less than the median height of the students in Mrs. Petunia's class

• Mr. Carter's class has a greater range in player heights than Mrs. Petunia's class has

• The mode height of the students in Mr. Carter's class is less than the mode height of students in Mrs. Petunia's class

Answer explanation

To find the range you need to subtract the highest value and the lowest value for each class

Tags

dot plots

teks 7.6g

range

median

mode

The dot plots show the number of pets students have in two classes. Which statement is best supported by the data?

• The mean of Mrs. Jones' class is higher than the mean of Mr. Carson's class.

• The range of Mr. Carson's class is lower than the range of Mrs. Jones' class.

• The median of Mr. Jones' class is equal to the median of Mr. Carson's class.

• The mode of Mrs. Jones' class is higher than the mode of Mr. Carson's class.

Answer explanation

Remember, the median is the middle data point

Tags

dot plots

teks 7.12a

mean

median

mode

The dot plots show the grades on a test of two different classes. Which statement is best supported by the data?

• The distribution of both sets of data are mostly symmetrical

• The mode of Ms. Henry's class is lower than the mode of Mrs. Clarence's class

• The median of Ms. Henry's class is higher than the median of Mrs. Clarence's class

• Mrs. Clarence's class has a higher range of test scores than Ms. Henry's class

Answer explanation

The mode is the option that has the most dots (data points) associated with it

Tags

dot plots

teks 7.12a

median

mode

range

I drew 10 names from a hat containing the names of every student that I teach, what type of sample have I taken?

• A random sample.

• A biased sample.

• A systematic sample.

• A voluntary response sample.

A(n) _______________________ is an entire group of objects from which data can be collected.

• Inference

• population

• random sample

• sample

• valid inference