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# Interpreting Statistical & Probability Data Chapter Exam

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!

### Page 1

#### Question 1 1. You decide to conduct a survey of families with two children. You are interested in counting the number of boys (out of 2 children) in each family. Is this a random variable, and if it is, what are all its possible values?

#### Question 2 2. An agency decides to conduct a survey on household incomes in their county. Let x = the household income. What type of variable is x?

#### Question 3 3. You conduct an experiment where you want to measure the number of rolls it takes to get two 6's in a row when you roll a fair six-sided die. State whether the random variable is discrete or continuous and give a summary of its values.

#### Question 4 4. Which of the following is NOT a property of a random variable?

####
Question 5
5.
A scientist is testing the growth speeds of a species of algae, and makes the following null hypothesis: *Specimens of this species grow at a rate of at least v.* They set their region of acceptance at 95% or higher, and find that 93% of the specimens grow at a rate of at least v. What should the scientist do and why?

### Page 2

#### Question 6 6. What is the first step in a hypothesis test?

#### Question 7 7. If the region of acceptance for a certain hypothesis is from 0% to 5%, then which of the following results is within the region of acceptance?

#### Question 8 8. What is a hypothesis?

#### Question 9 9. The linear model uses what to fit the data?

#### Question 10 10. Regression analysis relates what to each other?

### Page 3

#### Question 11 11. Which of the following can you do once you have a good model?

#### Question 12 12. What is the purpose for using a model in regression analysis?

#### Question 13 13. Which of the following is associated with a continuous random variable?

#### Question 14 14. A continuous probability distribution function is also known as which of the following?

#### Question 15 15. In a probability distribution function, what does the y-axis typically represent?

### Page 4

#### Question 16 16. Why is the result of rolling a die considered a discrete random variable?

#### Question 17 17. Samples are often used in research because...

#### Question 18 18. Which of the following is an example of a statistic?

#### Question 19 19. A sampling distribution is...

#### Question 20 20. Imagine that a researcher wants to examine the average home sale price in Florida over the last 30 days. She determines that 24,811 homes were sold during that time. She decides to randomly select 1,000 homes and documents the sale price of each one. The researcher calculates the average sale price of those 1,000 homes to be $190,000. In this example, which of the following is the statistic?

### Page 5

#### Question 21 21. If Mr. Smith polls 240 people and finds that 112 will vote for Bill Jones, which of the following is true?

#### Question 22 22. All of the following are important things to consider while sampling from a population EXCEPT:

#### Question 23 23. _____ are used because the population in its entirety is inaccessible and would require polling too many people.

#### Question 24 24. Which of the following situations would give us the best estimate of a population proportion?

#### Question 25 25. The number added to or subtracted from the point estimate is known as the:

### Page 6

#### Question 26 26. The _____ is the value of a sample statistic, which is used as an estimate of a population parameter.

#### Question 27 27. Which of the following can be used to calculate the confidence level?

#### Question 28 28. Why would a statistician use a point estimate instead of just trying to find the relevant population parameter directly?

#### Question 29 29. You decide to collect a bunch of cans of soda and measure the volume of soda in each can. Let x = the number of mL of soda in each can. What type of variable is x?

#### Question 30 30. How many hypotheses do you write in a hypothesis test?

#### Interpreting Statistical & Probability Data 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!

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