A person will either become infected with influenza during the current flu season or will not become infected with influenza during the current flu season. These two possible outcomes are considered mutually exclusive.

In a study examining the average appointment time for patients at a local dentist’s office, 54 patients had appointments less than 1 hour long and 2 patients had appointments lasting 5 hours. This distribution of patient appointment times would best be described as negatively skewed. 

Random sampling guarantees that you will obtain a representative sample of the population. 

A researcher collects information on the name of study participants’ health insurance coverage (e.g., Kaiser, Blue Cross, United). When graphing the frequencies reported for each of the different health insurance company names, it would be most appropriate for the researcher to use a histogram.

The probability that William will draw a blue marble from a bag of marbles is 1.0 (in decimal form). This indicates: 

Which of the following best represents an example of randomization (random assignment) in a research study? 

A researcher distributes a nutritional questionnaire to 100 survey participants and collects their responses. For which of the following collected variables would it be most appropriate to calculate the mean: 

Someone’s major of study (e.g., psychology, biology) at CSUN is an example of what level of measurement? 

Which of the following measures is NOT sensitive to extreme observations? 

The mean of each of the following two samples of observations is 5. Sample A: 4, 4, 4, 5, 5, 6, 6, 6 Sample B: 0, 0, 1, 5, 7, 8, 9, 10

Using data from a sample of 1,000 patients as evidence, a researcher claims that the average systolic blood pressure of residents of the state of California is 118. Would this best be described as descriptive or inferential statistics? 

A researcher asks each of 5 study participants how many extended family members they have who have ever been diagnosed with heart disease (for example, 1 family member or 4 family members). Would this variable best be described as discrete or continuous? 

The following graph shows the distribution of length of patient stays in a local hospital over the last year. Most people stay only a few days, with a small number of people staying over 30 days. Is the shape of this distribution normal, positively skewed, negatively skewed, or bimodal?

The following graph shows the distribution of length of patient stays in a local hospital over the last year. Most people stay only a few days, with a small number of people staying over 30 days. Which value would you expect to be larger (i.e., a higher number of days)?

Would state of residence (e.g., California, Florida) best be described as a qualitative or quantitative variable? 

A researcher wants to conduct a study measuring factors that affect a healthy lifestyle among US residents, with study variables assessing daily diet, amount exercise per week and how many times per week an individual consumes fast food. The researcher decides to recruit a sample of participants to collect data from by standing outside a gym in a suburb of Los Angeles and asking people passing by if they would be willing to participate in her study and complete her developed questionnaire. Would her chosen method of sampling be the best way to obtain a representative sample of her target population of all US residents?

Which frequency distributions are NOT appropriate to use with nominal data? 

Researchers attempt to draw a histogram, depicting data on the number of reported children from a sample of health department employees. Which of the following pieces of advice would you give them to correct errors in their attempted graph below? 

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below. 17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19 Which of the observations above would be considered an outlier?

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below. 17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19 Which of the following choices indicates the mode of the list of observations above?

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below. 17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19 Which of the following choices indicates the median of the list of observations above?

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below. 17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19 Which of the following choices indicates the range of the list of observations above?

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below. 17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19 Which of the following choices indicates the interquartile range (IQR) of the list of observations above?

Below is a set of observations representing the number of years between first infection with HIV to AIDS diagnosis from a sample of 8 infected individuals in Los Angeles County. 9, 14, 12, 16, 14, 19, 20, 24 Which of the following choices indicates the mean of the set of observations above?

Below is a set of observations representing the number of years between first infection with HIV to AIDS diagnosis from a sample of 8 infected individuals in Los Angeles County. 9, 14, 12, 16, 14, 19, 20, 24 Which of the following choices indicates the variance of the set of observations above?

Below is a set of observations representing the number of years between first infection with HIV to AIDS diagnosis from a sample of 8 infected individuals in Los Angeles County. 9, 14, 12, 16, 14, 19, 20, 24 Which of the following choices indicates the standard deviation of the set of observations above?