RSM 2 Exam

Eva is doing a study on hetero relationships and recruits 20 couples for her study. In order to get both sides of the story, she splits the participants by gender and randomly selects 10 men and 10 women from the 40 participants. This is called?

Stratified random sampling

The numbers used to summarize characteristics of a sample is known as ______.

Descriptive statistics

What can you use to help determine if your data are normally distributed?

Histogram

How much information about your sample should you include in your write-up?

Enough information that another researcher could replicate your study with different participants

Which of the following is a type of probability sampling?

Cluster sampling

Which of the following shouldn't you calculate for nominal variables?

All of the above (Only frequencies, mode, and percentages)

How can you help maintain confidentiality when reporting your results?

Keep names and ID numbers in a file separate from participant responses

Shawn wants to do a quick survey of food preferences and asks his classmates what their favorite food is. He is using ________ sampling.

Convenience sampling

Which of the following is NOT a characteristic of a normal distribution?

There are two distinct peaks

These studies are appropriate when trying to understand a pattern of change in a prevalence over time.

Descriptive

A _________ tells you what percentage of a distribution scored below a specific score.

percentile

Which analytic procedure in SPSS is used to obtain standard deviation

Descriptives

A distribution that is _______ is spread out and relatively flat.

Platykurtic

A descriptive study would NOT be appropriate to use to meet which which of the following goals?

To determine a cause-and-effect relationship between variables

In what part of the method section would you list your survey questions and answer choices?

Measures

Scores that are expressed in terms of standard deviations from the mean are called

Z scores

Increasing the _______ makes your results more representative of the population

Sample size

A ________ distribution is shaped like a bell

Normal/Mesokurtic

What are the two views available on SPSS?

Data & Variable

A simple count of how many times a score occurred in a sample is the

Frequency

The ________ describes how much, in general, the scores in a sample differ from the mean.

Standard Deviation

What descriptive statistic(s) would you use for normally distributed interval data?

Mean, SD

The arithmetic average is also known as the

Mean

A distribution that has an outlier at one end (either right or left side) is

Skewed

The three measures of central tendency are

Mean, Median, and Mode

Name one measure of variability

Standard Deviation (Ex. Range, Interquartile Range, and Variance

What is the mean? (Dr. Murphy's dog loves to play fetch and seems to never get tired. She decides to count how many times he fetches the ball each evening when she gets home from work. He chased the ball 24 times on Monday, 30 times on Tuesday, 17 times on Wednesday, 30 times on Thursday, and 24 times on Friday)

25

What is the median? (Dr. Murphy's dog loves to play fetch and seems to never get tired. She decides to count how many times he fetches the ball each evening when she gets home from work. He chased the ball 24 times on Monday, 30 times on Tuesday, 17 times on Wednesday, 30 times on Thursday, and 24 times on Friday)

24

What is the mode? (Dr. Murphy's dog loves to play fetch and seems to never get tired. She decides to count how many times he fetches the ball each evening when she gets home from work. He chased the ball 24 times on Monday, 30 times on Tuesday, 17 times on Wednesday, 30 times on Thursday, and 24 times on Friday)

24 and 30

Calculate the Standard deviation (Dr. Murphy's dog loves to play fetch and seems to never get tired. She decides to count how many times he fetches the ball each evening when she gets home from work. He chased the ball 24 times on Monday, 30 times on Tuesday, 17 times on Wednesday, 30 times on Thursday, and 24 times on Friday)

5.39

Calculate the z-score for 30 (Dr. Murphy's dog loves to play fetch and seems to never get tired. She decides to count how many times he fetches the ball each evening when she gets home from work. He chased the ball 24 times on Monday, 30 times on Tuesday, 17 times on Wednesday, 30 times on Thursday, and 24 times on Friday)

5/5.39 = 0.93 (the z score of 30 is 0.93 above the mean)

What is the average score (number) for this variable?

3.78