Quiz 1_ Attempt review _ Courses 2023-2024

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North Carolina State University *

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Statistics

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Apr 3, 2024

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3/28/24, 1:07 PM Quiz 1: Attempt review | Courses 2023-2024 https://moodle-courses2324.wolfware.ncsu.edu/mod/quiz/review.php?attempt=1395161&cmid=955431 1/6 Started on Wednesday, January 10, 2024, 7:46 PM State Finished Completed on Wednesday, January 10, 2024, 7:52 PM Time taken 6 mins 37 secs Points 5.25/10.00 Grade 52.50 out of 100.00 Question 1 Incorrect 0.00 points out of 1.00 A researcher is studying yearly consumption of soft drinks by children in North America. 250 children in North America are randomly selected and their yearly soft drink consumption is measured to be 36.3 gallons. The population of interest is... a. The yearly soft drink consumption of all North American children  b. The yearly soft drink consumption of these 250 North American children c. All children in North America d. These 250 North American children Your answer is incorrect. The correct answer is: All children in North America

3/28/24, 1:07 PM Quiz 1: Attempt review | Courses 2023-2024 https://moodle-courses2324.wolfware.ncsu.edu/mod/quiz/review.php?attempt=1395161&cmid=955431 2/6 Question 2 Incorrect 0.00 points out of 1.00 Question 3 Partially correct 0.75 points out of 1.00 Select all of the following which are true. In a simple random sample, the problem of non-response bias may occur if: Select one or more: a. Some individuals who answer the questions exaggerate their responses because they believe it is what the interviewer wants to hear.  b. Some individuals that are randomly selected refuse to participate. c. Some individuals that are selected speak another language and therefore are not able to answer the interviewer's questions. d. Some individuals who answer the questions lie because they are embarrassed to reveal the truth to the interviewer.  e. The sampling frame does not contain all individuals in the population.  Your answer is incorrect. The correct answers are: Some individuals that are randomly selected refuse to participate., Some individuals that are selected speak another language and therefore are not able to answer the interviewer's questions. For each description below, choose the best answer to describe the data type. Answers may be re-used. Number of bananas per bunch at a grocery store  Number of stories in the world's tallest buildings.  The length of time that a smoke detector functions properly.  Relative humidity level in hospital operating rooms.  Discrete Discrete Continuous Neither Your answer is partially correct. You have correctly selected 3. The correct answer is: Number of bananas per bunch at a grocery store → Discrete Number of stories in the world's tallest buildings. → Discrete The length of time that a smoke detector functions properly. → Continuous Relative humidity level in hospital operating rooms. → Continuous

3/28/24, 1:07 PM Quiz 1: Attempt review | Courses 2023-2024 https://moodle-courses2324.wolfware.ncsu.edu/mod/quiz/review.php?attempt=1395161&cmid=955431 3/6 Question 4 Correct 1.00 points out of 1.00 Question 5 Incorrect 0.00 points out of 1.00 The average number of miles a licensed adult in the US drives per day is 24. A random sample of 49 licensed adults in the US is collected and the average number of miles they drove was 22.8. The sample is... a. The 49 sampled licensed adults  b. The average number of miles these 49 licensed adults in the US drive c. The average number of miles all licensed adults in the US drive d. All licensed adults in the US Your answer is correct. The correct answer is: The 49 sampled licensed adults A researcher is studying yearly consumption of soft drinks by children in North America. 250 children in North America are randomly selected and their yearly soft drink consumption is measured to be 36.3 gallons. The statistic is... a. All children in North America b. The yearly soft drink consumption of all North American children  c. The yearly soft drink consumption of these 250 North American children d. These 250 North American children Your answer is incorrect. The correct answer is: The yearly soft drink consumption of these 250 North American children

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3/28/24, 1:07 PM Quiz 1: Attempt review | Courses 2023-2024 https://moodle-courses2324.wolfware.ncsu.edu/mod/quiz/review.php?attempt=1395161&cmid=955431 4/6 Question 6 Incorrect 0.00 points out of 1.00 A local politician is interested in the public opinion regarding a tax increase to fund improvements to the local public transportation services in Wake County. She decided to take a random sample of 250 voters in each of Wake County's voting precincts and polls each. (Assume that every voter in each of the precincts responds to the poll.) This is an example of: a. Cluster Sampling b. Voluntary Response Sampling c. Systematic Sampling d. Simple Random Sampling  e. Stratified Sampling Your answer is incorrect. The correct answer is: Stratified Sampling

3/28/24, 1:07 PM Quiz 1: Attempt review | Courses 2023-2024 https://moodle-courses2324.wolfware.ncsu.edu/mod/quiz/review.php?attempt=1395161&cmid=955431 5/6 Question 7 Partially correct 0.75 points out of 1.00 Question 8 Correct 1.00 points out of 1.00 A human resources director wants to give a survey to employees at a large company to study morale. She is trying to decide on the best way to select which employees to be included in her sample. For each description below, match the type of sample used. (Not all types will be used.) The company has 15 departments. She randomly chooses a number of employees from each department, proportional to the size of the department.  From a randomized master list of all employees, she sends the survey to every 15 person.  She hands the survey to the first 20 employees she sees walking past her office.  From a master directory of all employees, she uses a random number generator to select 1000 employees to receive the survey.  Cluster th Systematic Convenience Simple Random Your answer is partially correct. You have correctly selected 3. The correct answer is: The company has 15 departments. She randomly chooses a number of employees from each department, proportional to the size of the department. → Stratified From a randomized master list of all employees, she sends the survey to every 15 person. → Systematic She hands the survey to the first 20 employees she sees walking past her office. → Convenience From a master directory of all employees, she uses a random number generator to select 1000 employees to receive the survey. → Simple Random th A researcher is studying yearly consumption of soft drinks by children in North America. 250 children in North America are randomly selected and their yearly soft drink consumption is measured to be 36.3 gallons. The parameter of interest is... a. The yearly soft drink consumption of these 250 North American children b. These 250 North American children c. The yearly soft drink consumption of all North American children  d. All children in North America Your answer is correct. The correct answer is: The yearly soft drink consumption of all North American children

3/28/24, 1:07 PM Quiz 1: Attempt review | Courses 2023-2024 https://moodle-courses2324.wolfware.ncsu.edu/mod/quiz/review.php?attempt=1395161&cmid=955431 6/6 Question 9 Partially correct 0.75 points out of 1.00 Question 10 Correct 1.00 points out of 1.00 For each description below, choose the best answer to describe the data type. Answers may be re-used. Movie genres to choose from on Netflix.  Employment status (Full-time, Part-time, Unemployed)  The number of months that a smoke detector functions properly.  Amount of garbage (in pounds) discarded by apartment residents.  Categorical Neither Quantitative Quantitative Your answer is partially correct. You have correctly selected 3. The correct answer is: Movie genres to choose from on Netflix. → Categorical Employment status (Full-time, Part-time, Unemployed) → Categorical The number of months that a smoke detector functions properly. → Quantitative Amount of garbage (in pounds) discarded by apartment residents. → Quantitative The overall goal of the field of Statistics is to... a. Randomly collect data from populations of interest. b. Use representative samples to answer questions about a population of interest.  c. Use randomly collected parameters to answer questions about populations of interest. d. Use population data to answer questions about random samples. Your answer is correct. The correct answer is: Use representative samples to answer questions about a population of interest. ◄ ICA 1 Feedback Jump to... ICA 1 Key ►

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