A bag contains 5 red balls and 3 blue balls. What is the probability of drawing a red ball at random?
5/8
3/5
3/8
1/2
Descriptive statistics primarily deals with:
Testing hypotheses about population parameters
Summarizing and visualizing existing data
Drawing conclusions about populations from samples
Predicting future outcomes based on data trends
Events A and B are independent. The probability of A is 0.4, and the probability of B is 0.5. What is the probability of both A and B happening?
0.2
0.9
0.7
0.1
The 25th percentile is also known as the:
Third Quartile
First Quartile
Interquartile Range
Second Quartile
Which of the following is NOT a type of discrete probability distribution?
Poisson distribution
Binomial distribution
Normal distribution
Bernoulli distribution
If you toss a coin three times, what is the probability of getting at least one head?
1/8
7/8
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.
Which of the following is an example of a variable measured at the interval level?
Height in centimeters
Letter Grade (A, B, C, D, F)
Temperature in Fahrenheit
Gender
The mean of a dataset is 15 and the standard deviation is 3. What percentage of data points lie within 12 and 18?
Approximately 99.7%
Cannot be determined from the given information
Approximately 68%
Approximately 95%
What type of chart is best for displaying the distribution of a single continuous variable?
Scatter Plot
Pie Chart
Histogram
Bar Chart