A study analyzing the average income of doctors uses data from a publicly available database containing salary information for all licensed physicians in a country. What type of data collection method is this?
Experiment
Secondary Data Analysis
Observation
Survey
What is the primary difference between a discrete probability distribution and a continuous probability distribution?
Discrete distributions are used for quantitative data, while continuous distributions are used for qualitative data.
Discrete distributions are represented by graphs, while continuous distributions are represented by tables.
There is no difference; both types of distributions represent the same statistical concepts.
Discrete distributions deal with countable data, while continuous distributions deal with data that can take on any value within a range.
The temperature in Celsius is an example of what level of measurement?
Ordinal
Interval
Ratio
Nominal
Which of the following best describes a Type II error?
Failing to reject the null hypothesis when it is actually false.
Rejecting the null hypothesis when it is actually true.
Rejecting the alternative hypothesis when it is actually true.
Accepting the alternative hypothesis when it is actually false.
If the range of a dataset is 20, and the smallest value is 5, what is the largest value?
20
15
25
Cannot be determined
Which type of error occurs when we reject a true null hypothesis?
Sampling error
Type I error
Type II error
Type III error
A frequency distribution shows the:
Spread or variability of data points around the mean
Probability of a particular outcome in an experiment
Average value of a variable in a dataset
Number of times each value of a variable occurs in a dataset
What does a variance of zero indicate about a dataset?
The mean is zero.
All data points are the same.
The dataset has a large amount of variation.
The data is perfectly normally distributed.
The mean of a dataset is 15 and the standard deviation is 3. What percentage of data points lie within 12 and 18?
Cannot be determined from the given information
Approximately 68%
Approximately 99.7%
Approximately 95%
What level of measurement is represented by the ranking of restaurants from 1 to 5 stars?