Review Questions Module 1

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Concordia University *

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2920

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Statistics

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Apr 3, 2024

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REVIEW QUESTIONS MODULE 1 Part I select the most appropriate answer 1. Given that a manager wants to evaluate the number of defective products, the most appropriate level of measurement would be: a. Interval b. Ratio x c. Categorical d. Ordinal 2. Nicholas is studying cross-cultural differences in terms of family dynamics, and he wants to know your nationality and the size of your family (small=no siblings; medium=1-3 siblings, big=3 or more siblings). What scales of measurements will he use? a. Nominal and interval b. Nominal and discrete c. Ordinal and ratio d. Nominal and ordinal x 3. You want establish the probability of undergraduate students at Concordia University who plan to pursue graduate studies. Unfortunately, you do not have access to all undergraduates. You decide to interview only some JMSB students and interpret this result as representative of all undergraduates. Consequently, the result is: a. A parameter b. A census c. A statistic x d. Categorical variable 4. What would be an advantage of taking a census instead of a sample? a. Costs of data collection will be smaller b. Duration of data processing will be shorter and the results will be more accurate c. It is easier to survey the entire population than to take a sample d. It allows some of characteristics of the population to be known with certainty x 5. Netflix wants to know your level of satisfaction with the quality of its services. Identify the type of variable and the appropriate level of measurement: a. Categorical and ordinal x b. Categorical and nominal c. Ordinal and categorical d. Nominal and categorical 6. What type of variable is the quantity of gasoline pumped by Gulf Refining Company per day?

a. Qualitative b. Continuous x c. Discrete d. Independent 7. You want to take a mortgage on a house, and the questionnaire requires your income and your gender. The scales of measurement present in the questionnaire are: a. Nominal and ratio b. Ratio and nominal x c. Interval and nominal d. Ratio and ordinal 8. What type of variable is the number of students enrolled at Concordia University a. Discrete x b. Qualitative c. Nominal d. Continuous 9. A statistics class of 30 students evaluated the instructor using the following scale: superior, good, average, poor, and inferior. The descriptive summary showed the following survey results: 5% superior, 40% good, 45% average, 10% poor, and 0% inferior. Therefore a. Most students rated the instructor as good or average x b. The instructor’s performance was good c. The instructor’s performance was average d. More information is required to draw conclusions 10. A numerical value used as a summary measure for a sample, such as sample mean, is known as a a. Population statistic b. Sample parameter c. Population parameter d. Sample statistic x 11. A quantity of interest that can take on different values is known as a. A variable x b. A parameter c. A sample d. An observation 12. ________________ are collected from several entities at the same point in time a. Time series data

b. Categorical and quantitative data c. Cross-sectional data x d. Random data 13. A college instructor asked students in his chemistry class about their ages. Based on the age results collected, the instructor announces that the average age of all college students is 17 years. His statement is an example of a. Statistical description b. Statistical inference x c. Sample experiment d. A census Part II Solve the following problems 1. Fill in the sentences with the most appropriate terms: a. John believes his wife is a shopaholic. He wants to establish how much money his wife spends on shoes every month. This means he needs to use the____ratio______ level of measurement. b. Given the below information, the year in college is a_____ordinal___ level of measurement. 1. Freshman 2. Sophomore 3. Junior 4. Senior 5. Graduate c. A___census____ generates reliable and accurate data because it provides a complete enumeration of the population. d. ______Descriptive ___ statistic include measures of central tendency such as mean, mode and median, while __ inferential ______ statistics include hypothesis testing that helps us make conclusions about a claim or status quo. e. Distance is a ____continuous____ variable. f. If I select only 10 students from an accounting class of 60 students, I selected a____sample___. g. You are debating whether you should go to New York next month. The decision will be a ____categorical_____ variable. h. The weight of a box of Oreos in grams is an example of_____numerical___ variable. 2. Classify each of the following as N, nominal; O, ordinal; I, interval; or R, ratio data:

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a) brand of toothpaste you prefer N b) temperature in Montreal in degree Celsius I c) weight of your dog R d) number of degrees earned by your teachers R e) shirt sizes (XS, S, M, L ,XL, XXL) O 3. Match each term with its definition a) Income ii b) A statistic v c) She wears shoes size 8 iv d) A sample i e) Population iii With i. Is a portion of the population selected to represent the population ii. is an example of a variable that uses the ratio scale iii. is the collection of all the elements of interest iv. is an example a categorical variable v. is used to estimate the value of a population parameter

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