What is the probability of getting heads and then tails when flipping a fair coin twice?
1/4
1
1/2
3/4
What is the highest level of measurement for the variable 'weight of apples'?
Ratio
Interval
Nominal
Ordinal
Which of the following data types is most suitable for storing the number of children in a family?
Continuous
Discrete
What is the primary goal of hypothesis testing in statistics?
To prove the null hypothesis is true.
To prove the alternative hypothesis is true.
To calculate the exact value of the population parameter.
To determine the likelihood of observing the data if the null hypothesis were true.
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?
Secondary Data Analysis
Experiment
Observation
Survey
Which of the following is NOT a characteristic of a normal distribution?
Mean, median, and mode are equal
Asymmetry with a longer tail on one side
Bell-shaped and symmetrical
The total area under the curve equals 1
What is the commonly used significance level (alpha) in hypothesis testing?
0.10
0.05
0.01
0.50
A box plot can help identify which of the following in a dataset?
Mean
Correlation
Outliers
Causation
What is the range of the following dataset: 7, 12, 4, 9, 15, 11?
4
15
8
11
What does a variance of zero indicate about a dataset?
The dataset has a large amount of variation.
The data is perfectly normally distributed.
The mean is zero.
All data points are the same.