# Statistics Overview: Help and Review Chapter Exam

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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#### Question 1 1. A chart that shows the popularity or mode of a certain type of data is what?

#### Question 2 2. What is a part of a population used to describe the whole group?

#### Question 3 3. Which of the following is a type of random sampling?

#### Question 4 4. What is the relative frequency of losses for the Bears rounded to the closest whole percent?

#### Question 5 5. During the first four Summer Olympic games attended by the United States, these medal counts were awarded. Calculate the mean number of medals won during these Olympic Games. (Round it to the nearest whole number.)

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Question 6
6.
Find the population variance of the following data set:

11, 12, 55, 4, 17, 13, 19

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Question 7
7.
Jonathan knows he scored in the 25th percentile on his psychology test. The professor gives the students the following list of grades (without names):

51, 37, 87, 95, 99, 78, 63, 96, 68, 84, 92

Assuming that there are 11 students in the class, what was Jonathan's test score?

#### Question 8 8. What can we show using a histogram?

#### Question 9 9. Simple random sampling is usually done _____.

#### Question 10 10. What is the difference between the upper quartile value and the lower quartile value?

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Question 11
11.
What is the minimum in the data set?

105, 88, 93, 102, 97, 93, 96, 86, 88, 82, 79, 85, 77, 94, 91, 87

#### Question 12 12. What do we call a chart that shows the popularity or mode of a certain type of data and the likelihood that a given event will fall below the frequency distribution?

#### Question 13 13. Which axis of a histogram usually shows the categories into which the various members of a data set fall?

#### Question 14 14. Analyze the following statements and indicate which one best describes the difference between the population and the sample.

#### Question 15 15. Which of the following conditions must be met for a sample to be a stratified random sample?

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#### Question 16 16. What is a graphical representation of the distribution of data?

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Question 17
17.
Jackie is conducting a survey. Her population contains 100 people with strata divided into the following proportions:

20%, 10%, 10%, 30%, 30%

If Jackie wants to select 10 people for her sample, then how many people from each stratum would she pick?

#### Question 18 18. When selecting strata groups, it is recommended you have:

#### Question 19 19. Elizabeth is waiting for her flight at the airport. She decides to conduct an experiment. She wants to know how many people at the airport carry a laptop with them for their flight. She sees 50 people walk past her as she waits. Thirty of those people are carrying laptops. What is the population and sample in this scenario?

#### Question 20 20. You should use cluster sampling when the clusters are _____ in a population.

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#### Question 21 21. A _____ is a part of a population used to describe the whole group.

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Question 22
22.
Find the first quartile for the following data set:

7, 9, 13, 4, 18, 3, 9, 10, 15, 8, 2, 6, 9

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Question 23
23.
Find the variance for the following data set:

101, 106, 125, 142, 78, and 109

#### Question 24 24. If we're looking at a table where the last column contains decimal numbers between 0 and 1, what type of table are we looking at?

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Question 25
25.
Phyllis is also in Jonathan's psychology class. She knows she scored in the 90th percentile on his psychology test. The professor gives the students the following list of grades (without names):

51, 37, 87, 95, 99, 78, 63, 96, 68, 84, 92

Assuming that there are 11 students in the class, what was Phyllis's test score?

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#### Question 26 26. Stratified random sampling works best when the researcher is familiar with the demographics of the population and:

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Question 27
27.
Select the word or phrase that best fills in the blank:

If the index is not a _____, round the number up, then count the values in the data set from least to greatest until you reach the index.

#### Question 28 28. What is a chart that shows the popularity or mode of a certain type of data?

####
Question 29
29.
Find the sample variance of the following data set:

2, 3, 4, 7, 10, 1, 2

#### Question 30 30. Histograms are very similar to what other graphical representation of numbers?

#### Statistics Overview: Help and Review Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!