# Statistics & Sampling Basics Chapter Exam

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### Page 1

#### Question 1 1. A statistician makes a graph, which includes a shape that's almost mirrored perfectly across a line, but not quite. How should we describe the shape?

#### Question 2 2. When members belong to multiple groups in the population this is called _____. Cluster sampling _____ have this.

#### Question 3 3. 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.)

#### Question 4 4. What is the measure of how far the numbers in a data set are away from the mean or the median?

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Question 5
5.
What is the range of the data set below?

3, 7, 9, 11, 11, 11, 15, 17, 18, 24

### Page 2

#### Question 6 6. All of the following statements are correct, EXCEPT:

#### Question 7 7. What is the midpoint value of a data set, where the values are arranged in ascending or descending order?

#### Question 8 8. When selecting strata groups, it is recommended you have:

#### Question 9 9. A(n) _____ is all members of a specified group.

#### Question 10 10. During the first four Summer Olympic games attended by the United States, these medal counts were awarded. Calculate the range number of medals won during these Olympic Games.

### Page 3

#### Question 11 11. With what kind of value set does the mean provide the best representation?

#### Question 12 12. If a data set has two different modes, then what is it?

#### Question 13 13. The law of large numbers is also known as:

#### Question 14 14. Which is a sampling method that involves separating the population into clusters, and then selecting random samples from each of the clusters?

#### Question 15 15. During the first four Summer Olympic games attended by the United States, these medal counts were awarded. Calculate the mode number of medals won during these Olympic Games.

### Page 4

#### Question 16 16. What do we call a value that is much smaller or larger than the other values in a data set?

#### Question 17 17. What do we call areas in a data set where no observations have been made?

#### Question 18 18. Simple random sampling is usually done _____.

#### Question 19 19. A sample is usually intended to be

#### Question 20 20. What is a single number that summarizes an entire data set?

### Page 5

#### Question 21 21. What are three methods you can use to find the spread in data?

#### Question 22 22. To find the median of a set of values, what is the first thing one must do?

#### Question 23 23. When doing systematic sampling, you must remember that all outcomes must be given _____ chance of being selected.

#### Question 24 24. To find the interval you need, take your population divide by the _____.

#### Question 25 25. If there are two modes, you should _____.

### Page 6

#### 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.
The following data set represents the average number of children per family for 10 countries in 2014. Calculate the mean number of children per family.

5.8, 6.1, 1.9, 1.4, 2.6, 2.8, 1.3, 4.4, 4.4, 1.7

#### Question 28 28. What is the difference between the upper quartile value and the lower quartile value?

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Question 29
29.
Beth is an apartment complex manager, she wants to plan some activities for the residents that will increase a sense of community among them. She knows that age appropriate events will attract more residents. According to the rental applications, the ages of her residents are as follows:

60, 48, 26, 20, 66, 49, 22, 25, 63, 59

From this, Beth knows the mean age of her residents is 43.8. She will schedule activities that individuals in their mid-forties (43-46) will enjoy. Would finding the *median* of this data set be more helpful for Beth? Why?

*median*of this data set be more helpful for Beth? Why?

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Question 30
30.
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?

#### Statistics & Sampling Basics 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!