MATH302 - Week 1 Knowledge Check 1

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American Military University *

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302

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Statistics

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Feb 20, 2024

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Week 1 Knowledge Check Homework Practice Quest… Attempt 1 of 4 Written Jan 4, 2024 8:35 PM - Jan 4, 2024 9:15 PM Attempt Score 18 / 20 - 90 % Overall Grade (Highest Attempt) 19.67 / 20 - 98.33 % Question 1 1 / 1 point What is the sampling method used in the following scenario? The librarian at a public library wants to determine what proportion of the library users are children. The librarian has a tally sheet on which she marks whether books are checked out by an adult or a child. She records this data for every fourth patron who checks out books. Question 2 1 / 1 point A market researcher polled every tenth person who walks into a store. What type of sampling was used? systematic cluster convenience stratified simple random Cluster

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. Question 4 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? Question 5 1 / 1 point Stratified Simple Random Systematic Convenience convenience stratified cluster simple random systematic Cluster Convenience Stratified Systematic Simple Random

A computer generates 100 random numbers, and 100 people whose names correspond with the numbers on the list are chosen. What type of sampling was used? Question 6 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 In this case, X is an example of : Question 7 1 / 1 point What is the term for a characteristic or attribute that can assume different values? Question 8 1 / 1 point Convenience Systematic Simple Random Stratified Cluster data a statistic population a variable exponent sample datum variable

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Which of the following correctly describes the relationship between a sample and a population? Question 9 1 / 1 point Round the number 1599.666667 to the nearest hundredth. Answer: 1599.67 Question 10 1 / 1 point When collecting your data, you notice that your results are very different from your classmates. What should you do? Question 11 1 / 1 point A sample is: A sample is a group of populations that are subject to observation. A sample is a group of subjects selected from a population to be studied. A population and a sample are not related. A population is a group of samples that may or may not be included in a study Reevaluate your accuracy. Average your scores with the class mean. Nothing, it is perfectly fine to have different samples. a characteristic of interest for each person or thing in the population. the collection of all individuals, objects or measurements being studied. a number that is a property of the population. a portion of the population under study.

Question 12 1 / 1 point Round the fraction to 4 decimal places. Make sure you put the 0 in front of the decimal. Answer: 0.7778 Question 13 1 / 1 point As sample size increases, variability in samples: Question 14 1 / 1 point Use the following information to answer the question: The (incomplete) table below contains data on hurricanes that have made direct hits on the U.S. Between 1851 and 2004. A hurricane is given a strength category rating based on the minimum wind speed generated by the storm. Frequency of Hurricane Direct Hits Category Number of Direct Hits Relative Frequency Cumulative Frequency 7 9 Increases Decreases Remains the same

1 109 0.3993 0.3993 2 72 0.2637 0.6630 3 71 0.2601 4 18 0.9890 5 3 0.0110 1.0000 Total=273 What is the relative frequency of direct hits that were category 4 hurricanes? Question 15 1 / 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 Frequency Relative Frequency Cumulative Relative Frequency Not enough information to calculate 0.2601 0.0768 0.0659

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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: 30 (50 %) Answer for blank # 2: 90 (50 %) Question 16 1 / 1 point What measurement scale is used in the following example? Time of day on an analog watch Question 17 1 / 1 point What measurement scale is used in the following example? Incomes Ratio Nominal Ordinal Interval

measured in dollars. Question 18 1 / 1 point What measurement scale is used in the following example? The distance in miles to the closest grocery store Question 19 0 / 1 point What measurement scale is used in the following example? Baking temperatures for various main dishes: 350, 400, 325, 250, 300. Question 20 1 / 1 point What measurement scale is used in the following example? Political outlook: extreme left, left-of-center, right-of-center, extreme right Ordinal Nominal Ratio Interval Ratio Interval Ordinal Nominal Nominal Interval Ordinal Ratio Ordinal Interval

Done Ratio Nominal

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