## PSYC 354 Exam 2

PSYC 354 Exam 2

- This table represents the fictional scores of a set of participants who rated their anxiety levels for the past two weeks on a scale from 1 to 4, 1 indicating No Anxiety and 4 indicating Anxiety Most of the Time. The range in this data set is:
- Sixteen college freshmen were asked to record the number of alcoholic drinks they typically consume in a week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the range of this distribution?
- Random samples are almost never used because
- Without many trials, we cannot determine true probabilities of events. However, over the long run, and numerous trials, the expected relative‐frequency of events is very clear and predictable. This is known as the:
- Brent tosses a quarter 4 times and 3 times it comes up heads. The percentage of heads is:
- Six students from a statistics class reported the number of hours of television they watched per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the mean number of hours of television watched per week for this sample of six students?
- Here is a set of data: 44, 52, 51, 37, 49, 55, 48, 39. Compute a deviation score for the data point 51.
- Which set of scores has the least amount of variability?
- Which of the following is an example of a testimonial?
- This table represents the fictional scores of a set of participants who rated their optimism levels on a scale from 1 to 7, with 1 indicating very unoptimistic and 7 indicating very optimistic. The mean in this data set is:
- With random ___________ participants have the same chance of being exposed to any level of the independent variable; with random ___________ participants have an equal chance of being recruited to the study.
- What is the correct formula for calculating a probability?
- In a sample of data set that has several extremely low scores, creating negative skew:
- A statement that there is no difference between populations is a:
- Here is a set of data: 44, 52, 51, 37, 49, 55, 48, 39. Compute a deviation score for the data point 44.
- Two events are said to be independent events when:
- The statement “There’s a 95% chance that I will get an A on my midterm examination” best illustrates what concept?
- Based on the following set of scores, what score is most likely an outlier? 18, 99, 14, 16, 31, 43, 12, 14, 13, 51, 12
- Surveying a population by using a random number generator to determine sample selection is _______________ whereas asking the people you know is
- In a study of the effects of humor on memory, Schmidt (1994. had participants read either humorous sentences or non‐humorous sentences and then later tested participants’ memory for the sentences. Identify the null hypothesis this study.
- Brent tosses a quarter 4 times and 3 times it comes up heads. The proportion of heads is:
- When calculating the median for an odd number of scores, which have been placed in ascending order, the median will actually be the
- Around the end‐of‐year holidays, such as Thanksgiving, a great amount of meat is purchased. To be prepared for the increased demand, a local grocery store manager wants to know the typical amount of ham sold at medium‐sized stores around Thanksgiving. But even more than that, he wants to know how sales tend to vary around that typical amount because he wants to be prepared to sell as many hams as possible. His interest in how much sales vary will require a measure of:
- A researcher analyzed the results of her data and calculated the standard deviation of scores at 3.5. What is the variance?
- A unimodal distribution has ________ mode(s).
- For a sample of raw test scores, each student received a unique value, with no overlapping scores. For these data, there will be no:
- At 24 years of age, Megan is 5 feet, 6 inches tall. The national average for height is 5 feet, 4 inches, so Megan is taller than average. The national average is a:
- Suppose we compute the standard deviation and find that it is equal to 5.50. This number means that the numbers in the sample deviate, on the average:
- When working with nominal data, which measure of central tendency is best?
- For a sample of data, the mean, median, and mode are all the exact same value. What is likely true of this distribution?
- Variance is the average of deviations around the mean expressed in _______ units.
- The ________ is the difference between the lowest and highest score in the distribution.
- A researcher analyzed the results of her data and calculated the variance of scores at 88.00. What is the standard deviation?
- Six students from a statistics class reported the number of hours of television they watched per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the median number of hours of television watched per week for this sample of six students?
- Confirmation bias predicts that people will ignore or be most cynical about:
- A frequency table lists
- If a psychologist summarizes data for a variable in a frequency table, but finds that there are so many values for the variable that the table is too cumbersome to be useful, the next step would be to make a
- When a distribution is skewed to the right it means that
- A psychologist wants to study PTSD in soldiers returning from the Middle East in order to develop a treatment program. The psychologist has not decided how to assess PTSD yet. At this point, “PTSD” is a(n)
- If a student sees 5.0‐9.9 in a table in an article in a psychology journal, the student is seeing