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# Statistical Analysis: Descriptive & Inferential Statistics Chapter Exam

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#### Question 1 1. Which one of the following coefficients indicates that the two variables of interest move in opposite directions while remaining within the possible range of correct calculations?

#### Question 2 2. Which one of the following coefficients indicates the strongest relationship between two variables while remaining within the possible range of correct calculations?

#### Question 3 3. If your data produces a p-value of 0.12, which of the following would be true concerning your study?

#### Question 4 4. Which of the following is a p-value that would show statistical significance?

#### Question 5 5. Brian is conducting a study to determine whether meditation affects body weight. Brian plans to have three different groups, where each group will be assigned a different length of meditation time. When Brian gathers his data, he will compare the body weights of the participants between groups. Which type of ANOVA is Brian using?

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#### Question 6 6. Brian wants to know if there is a significant difference between the means in the study he is conducting. What value does Brian need to examine?

#### Question 7 7. Identify which of the following is NOT an example of descriptive statistics:

#### Question 8 8. A candy company is introducing a new brand of chocolate to the market. They have advertised heavily, investing $8,000,000 in New York, but no ads were run in Boston. After analyzing the data, they have found no statistically significant difference between their sales in New York and Boston. Why is this an example of inferential statistics?

#### Question 9 9. Which of the following is a common P value used for the Chi-Square test?

#### Question 10 10. In the chi-square test equation, you must find the difference between which of the following?

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#### Question 11 11. Peyton has a coin that she claims is lucky, meaning it will land on heads more often than a regular coin does (50% of the time). Which of these could be the alternative hypothesis to test this claim?

#### Question 12 12. The regression line has an equation of y = 10 + -2x with a correlation coefficient of -1. Which of the following is true about this regression line?

#### Question 13 13. After performing an ANOVA, the F-ratio is calculated to be 2.29. At a significance level of alpha = 0.01, the critical F-ratio is 3.42. Based on this information, which of the following statements is true?

#### Question 14 14. Sarah performs an ANOVA and calculates that the between groups variation is 10.6 and the within groups variation is 2.2. What is the F-ratio?

#### Question 15 15. A group of seven people have taken a quiz and their scores are 8,9,10,5,8,9 and 10. Calculate the standard deviation.

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#### Question 16 16. When are degrees of freedom lost?

#### Question 17 17. A researcher asks two groups of people to look at either food or crayons and then rate their level of hunger. The difference between the average hunger ratings is not significant. The researcher can conclude that:

#### Question 18 18. A non-significant result tells the researcher:

#### Question 19 19. When a research sets out to find a sample for research, she must make sure that everyone in the larger population has an equal opportunity to be selected this is so that she can avoid which of the following?

#### Question 20 20. _____ is whether or not the results of a study will be used to change the way people do things and _____ is whether or not the results of a study conform to a predetermined level of measurement.

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#### Question 21 21. For the results of a study to be thought to support a hypothesis, researchers must prove that the results have _____.

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Question 22
22.
Which of the following is the mean of the set of data below?

3, 6, 2, 8, 6, 6, 2, 8, 4

#### Question 23 23. Sarah has a group of subjects from a school district in a large city. The subjects are just like the rest of the population in age, gender, race, and socioeconomic status. However, her sample is not representative. Which of the following best explains why Sarah's subjects are not representative of the population?

#### Question 24 24. The purpose of research is to _____.

#### Question 25 25. Which of the following is an example of categorical data?

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#### Question 26 26. From a recent survey of 60 people, we found that 10 liked to eat chocolate ice cream, 20 liked strawberry ice cream, 14 liked vanilla ice cream, and 16 liked Neopolitan ice cream. What is the percentage for each group?

#### Question 27 27. Which of the following statements best describes 'statistical significance'?

#### Question 28 28. Why is a two-tailed test sometimes referred to as the non-directional hypothesis?

#### Question 29 29. Which of the following p-values shows statistical significance?

#### Question 30 30. Given a p-value of 0.84, what is the probability that the hypothesis is true?

#### Statistical Analysis: Descriptive & Inferential Statistics 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!