Math 302 Practice test for week 1

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University of South Carolina *

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MISC

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Statistics

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Apr 3, 2024

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docx

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Uploaded by ledgend28

Practice test for week 1 Question 1 1 A market researcher polled every tenth person who walks into a store. What type of sampling was used? Cluster Stratified Simple Random Systematic Convenience Question 2 1 / 1 point What is the sampling method used in the following scenario? The marketing manager for an electronics chain store wants information about the ages of its customers. Over the next two weeks, at each store location, 100 randomly selected customers are given questionnaires to fill out asking for information about age, as well as about other variables of interest. systematic simple random convenience cluster stratified Question 3 1 / 1 point What is the sampling method used in the following scenario? A teacher wants to know if her students are doing homework, so she randomly selects rows two and five and then calls on all students in row two and all students in row five to present the solutions to homework problems to the class. convenience stratified cluster simple random

systematic Question 4 1 / 1 point "Number of times per week" is what type of data in the scenario? A study was done to determine the age, the number of times per week, and the duration (amount of time) of residents using a local park in San Antonio, Texas. The first house in the neighborhood around the park was selected randomly, and then the resident of every eighth house in the neighborhood around the park was interviewed. Qualitative Quantitative Discrete Quantitative Continuous Question 5 1 / 1 point A group of test subjects is divided into twelve groups; then four of the groups are chosen at random. What type of sampling is used? Cluster Convenience Stratified Systematic Simple Random Question 6 1 / 1 point A Lake Tahoe Community College instructor is interested in the mean number of days Lake Tahoe Community College math students are absent from class during a quarter. X = number of days a Lake Tahoe Community College math student is absent In this case, X is an example of : data a statistic population a variable Question 7 0 / 1 point

A marketing company is interested in the proportion of people who will buy a particular product. Identify the statistic. the proportion of the sample who will buy the product all people (maybe in a certain geographic area, such as the United States) a group of the people the proportion of all people who will buy the product Question 8 0 / 1 point A Lake Tahoe Community College instructor is interested in the mean number of days Lake Tahoe Community College math students are absent from class during a quarter. X = number of days a Lake Tahoe Community College math student is absent The instructor's sample produces a mean number of days absent of 3.5 days. This value is an example of a: parameter statistic data variable Question 9 0 / 1 point The local news is conducting a poll of the residents' opinions regarding a new traffic law that is being proposed. At the end of a news segment, viewers had the opportunity to dial in or use social media to choose whether they agree or disagree with the law. A large sample size was represented, and this poll was repeated again one week later with similar results. When working with this data, which of the following statements best applies? The surveys are biased because people chose to respond or not. Because of the large sample size, the results are most accurate of all members of the community. The same sampling methods were used for both polls, demonstrating reliability. Question 10 1 / 1 point Round the following number to four decimal places. Make sure you put the 0 in front of the decimal. 0.05262083399

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Answer: 0.0526 Question 11 1 / 1 point Crime-related and demographic statistics for 47 US states were collected from government agencies, including the FBI's Uniform Crime Report. One analysis of this data found a strong connection between education and crime indicating that higher levels of education in a community correspond to higher crime rates. Which of the potential problems with samples discussed below could explain this connection? Confounding Misleading use of data Self-funded or self-interest study Non-response or refusal of subject to participate Hide question 11 feedback Confounding: There are many factors that define a community other than education level and crime rate. Communities with high crime rates and high education levels may have other lurking variables that distinguish them from communities with lower crime rates and lower education levels. Because we cannot isolate these variables of interest, we cannot draw valid conclusions about the connection between education and crime. Possible lurking variables include police expenditures, unemployment levels, region, average age, and size. n 12 1 Round the number 1599.666667 to the nearest hundredth. Answer: 1599.67 Question 13 1 / 1 point As sample size increases, variability in samples: Remains the same Decreases Increases Question 14 0 / 1 point Fifty part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below:

Part-time Student Course Loads # of Courses Frequenc y Relative Frequency Cumulative Relative Frequency 1 30 0.6 2 15 3 Answer the following two questions: What percent of students take exactly two courses? Round to a whole number. Do not include decimals. ___% What percent of students take one or two courses? Round to a whole number. Do not include decimals. ___% Answer for blank # 1: 15 (30) Answer for blank # 2: 45 (90) Question 15 1 / 1 point Which of the following could be a cumulative frequency graph?

Question 16 1 / 1 point What measurement scale is used in the following example? Incomes measured in dollars. Interval Nominal Ratio Ordinal Question 17 1 / 1 point

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What measurement scale is used in the following example? Common letter grades: A, B, C, D and F Ordinal Nominal Ratio Interval Question 18 1 / 1 point What measurement scale is used in the following example? A satisfaction survey of a social website by number: 1=Very Satisfied 2= Somewhat Satisfied 3=Not Satisfied Ratio Interval Ordinal Nominal Question 19 1 / 1 point What measurement scale is used in the following example? The dates 1066, 1492, 1644, 1947 and 1944 Interval Nominal Ratio Ordinal Question 20 1 / 1 point What measurement scale is used in the following example? Color of your hair. Ratio Nominal Interval Ordinal

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