Which of the following is NOT a measure of dispersion?
Variance
Standard Deviation
Range
Median
A bag contains 5 red balls and 3 blue balls. What is the probability of drawing a red ball at random?
3/5
3/8
1/2
5/8
Which of the following is NOT a characteristic of a normal distribution?
Asymmetry with a longer tail on one side
Mean, median, and mode are equal
Bell-shaped and symmetrical
The total area under the curve equals 1
Which of the following correctly defines the null hypothesis?
The statement we are trying to prove.
The statement of no effect or no difference.
The statement that is rejected if the p-value is greater than the significance level.
The statement that is accepted if the p-value is less than the significance level.
Which measure of central tendency is most affected by extreme values (outliers)?
All are equally affected
Mean
Mode
What is the probability of getting heads and then tails when flipping a fair coin twice?
1
3/4
1/4
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?
0.1
0.9
0.7
0.2
The area under a probability distribution curve represents:
The standard deviation of the distribution
The mean of the distribution
The total probability of all possible outcomes, which always equals 1
The probability of a specific value occurring
A researcher surveys 100 people and asks them how many pets they own. What type of graph would be most appropriate for displaying the frequency of each response (number of pets)?
Scatter plot
Histogram
Line graph
Pie chart
In a probability distribution, what does a higher peak indicate?
Lower probability of values around the peak
Greater variability in the data
Smaller sample size
Higher probability of values around the peak