Answer: Interval
Question: A researcher decides to take a random sample of individuals from the population and then track their sugar intake. Assuming the data collected on each individual will be classified into different levels of intake including little to no sugar intake, moderate sugar intake, and high sugar intake, which type of graph would allow the researcher to best represent the data they have collected?
Answer: Histogram
Question: Leonard is deciding whether to purchase a wireless speaker from a major online retailer. He looks at the reviews for the speaker and notices that out of 100 reviews posted (all from people aged 18 – 34), 95 give ratings as 4 or 5 stars and only 1 review is 3 stars or less. He does, however, notice that the 5-star reviews were mostly posted very recently, just after the past holiday season. What type of sampling is Leonard using? Random Systematic Stratified Cluster
Answer: This is not a sampling method being used by Leonard; rather, this is an example of a non-random sample of online reviews that he is examining, which may not be representative of all customers’ opinions.
Question: Robert wants to estimate the defect rate in his inventory of headphones. He pulls the first 50 units from a pallet and inspects them. What type of sampling is Robert using? Random Systematic Stratified Cluster
Answer: Systematic
Question: A large manufacturing firm is interested in improving worker productivity. It randomly selects 150 workers from its factory and gives a period of one month collects data on the number of overtime hours worked and the total output produced per worker within the sample. Which of the following is true? The research is an observational study. The study is an experiment. The control factor is the number of overtime hours worked. The study is an experiment. The control factor is the worker productivity. This is neither an observational study nor an experiment.
Answer: The research is an observational study.
Question: A blood bank technician wants to estimate the proportion of people who have a certain blood type. The technician divides the records by age and sex and then randomly selects a proportionate number of records from each subgroup to test. Convenience sampling Systematic sampling Stratified sampling Cluster sampling
Answer: Stratified sampling
Question: The geography teacher makes a list of ten countries to visit from least to most expensive. What is the level of measurement of the data? Nominal Ordinal Ratio Interval
Answer: Ordinal
Question: Robert wants to estimate the defect rate in his inventory of headphones. He pulls the first 50 units from a pallet and inspects them. What type of sampling is Robert using? Random Systematic Stratified Cluster
Answer: Systematic
Question: An employed and systematic way which research is conducted is known as ______.
Answer: The scientific method.
Question: Marital status is best defined as which of the following types of variables?
Answer: Nominal/Categorical
Question: If political affiliation is considered a population parameter in a specific US state, then which of the following is an example of a sample statistic for this population? The political affiliation of the majority of people in the state. The political affiliations of the entire population in the state. The political affiliations of a random sample of people from the state. The people who voted in the post election.
Answer: The political affiliations of a random sample of people from the state.
Question: Larry is estimating the income levels of households in a specific zip code. She randomly asks 100 households and collects information about their income levels. Which of the following is not true? The average income level of all households in the zip code is a population parameter. The total income of the surveyed households is a sample statistic. The average income of the surveyed households is a sample data. The surveyed households are considered a sample of the overall population of households living in the zip code.
Answer: The average income level of all households in the zip code is a population parameter.
Question: A lab technician is studying the time it takes for a pharmaceutical drug to take effect in a sample of 120 study participants. She instructs everyone in the sample to take the drug according to how long they will be asleep. Then the first group takes the drug 30 minutes before eating, the second group takes the drug along with food, and the third group takes the drug 30 minutes after eating. Which of the following is true? The research is an observational study. The study is an experiment. The control factor are the number of participants in the test. It is neither an observational study nor an experiment. The study is an experiment. The control factor is the time when the drug is taken relative to consuming food.
Answer: The study is an experiment. The control factor is the time when the drug is taken relative to consuming food.
Question: A lab technician is measuring the concentration of sugar in urine samples from patients. The concentration measurements represent what kind of data? Qualitative Counting quantitative Discrete quantitative None of the above
Answer: Discrete quantitative
Question: Select the scenario below that demonstrates sampling error. The parents of the basketball players, from teams participating in a high school tournament, were used as the sample to determine which players’ team had the best prospects of the season. An online retailer is conducting a survey of the quality of one of its products. It is asking randomly selected customers who purchased the product to give a rating between 1 and 5 stars. A pharmaceutical estimates a random sample consisting of half of all sales of a product in order to determine a default rate. A study is conducted to determine the favorite flavor of ice cream among the customers of an ice cream shop with three locations in town. The individuals who purchased ice cream at one particular location were randomly selected and used as the sample.
Answer: The parents of the basketball players, from teams participating in a high school tournament, were used as the sample to determine which players’ team had the best prospects of the season.
Question: Select the scenario below that demonstrates sampling bias. A study is conducted about which type of a credit card customers prefer. The employees of American Express Co. are used as the sample. A hospital conducts a study about the quality of a new MRI machine, all patients who use the machine were used as the sample. A study is conducted to determine people’s preference for specific sports training services. Ten people were randomly selected and asked about their preferences to training services. A restaurant manager wants to determine the quality of its servers’ performance so she asks each of the restaurant’s patrons to give a rating of their experience with their server.
Answer: A study is conducted about which type of a credit card customers prefer. The employees of American Express Co. are used as the sample.
Question: A restaurant asks each of its customers during a specific month to provide an online review of its services in exchange for a $10 gift card to be used afterward. As a result, that month all the online reviews presented in this way represented a misleadingly positive bias. The sample is biased. The sample size is insufficient. The data contains an outlier. The statistic contains a calculation error.
Answer: The sample is biased.
Question: What is the median blood glucose level of the following data set collected from 8 individuals: 89, 95, 102, 106, 108, 113, and 119?
Answer: 106