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Statistics and probability Quiz
Statistics and probability Quiz
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1
24. If two events are mutually exclusive, what is the probability of both events occuring?
d. The maximum of their probabilities
a. The sumof their probabilities
b. The product of their probabilities
c. The difference of their probabilities
2
21. What is the probability of rolling a number greater than 4 on a fair six- sided die?
a.1/6
d. 2/3
c. 1/2
b. 1/3
3
18. If the correlation coefficient between two variables is 0, what can be said about their relationships?
d. They have a weak correlation
a. They have a strong positive correlation
c. They have no correlation
b. They have a strong negative correlation
4
13. What is the probability of rolling an even number on a fair six- sided die?
c. 1/4
b. 1/3
a. 1/2
d. 1/6
5
9. In a binomial distribution, what does the 'n' represent?
b. Standard deviation
d. Probability of success
a. Mean
c. Number of trials
6
12.If the probability of event A is 0.4 and the probability of event B is 0.3, what is the probability of either A or B?
d. 0.7
a. 0.1
c. 0.3
b. 0.2
7
6. What is the formula for calculating the variance of a dataset?
b. Sum of deviations from the mean divided by sample size
d. Sum of deviations from the mean divided by a sample size minus 1
a. Sum of squares of deviations from the mean divided by sample size
c.Sum of squares of deviations from the mean divided by sample size minus 1
8
11. What is the range of the following dataset: { 12,14,16,18,20} ?
d. 10
a. 2
b. 6
c. 8
9
16. What is the probability of drawing a red card from a standard deck of 52 cards?
b. 1/26
a. 1/13
d. 1/4
c. 1/2
10
7. Which of the following is a measure of the spread of a dataset?
c.Mode
b. Median
a. Mean
d. Standard deviation
11
15. If the z- score of a data point is negative, what does it indicate?
d. The data point is a minimum value
a. The data point is below the mean
c. The data point is equal to the mean
b. The data point is above the mean
12
5. If two events are independent, what is the probability of both events occuring?
a. The sum of their probabilities
c. The difference of their probabilities
d. The product of their probabilities
b. The product of their probabilities
13
8. If the correlation coefficient between two variables is 0-8, what can be said about their relationship?
d. They have weak correlation
a.They have strong positive correlation
b. They have strong negative correlation
c. They have no correlation
14
23. If two events are mutually exclusive, what is the probability of both events occuring?
c. The difference of their probabilities
b. The product of their probabilities
a. The sum of their probabilities
d. The maximum of their probabilities
15
22. What is the formula for calculating the covariance between two variables?
a. €(x-U)²/n
b. €(xy)/n
c. √(€(x-U)²/n)
d. €(x-U)(y-v)/n
16
4.What is a probability of rolling a 6 on a fair six - sided die?
a . 1/6
c. 1/2
d. 1
b. 1/3
17
10. What is the mode of the following dataset: { 3,5,5,7,9} ?
d. 9
c. 7
a. 3
b. 5
18
17. What is the formula for calculating the standard deviation of a sample?
d. €(x-U)/n-1
c. √(€(x-U)²/n-1)
a. √(€(x-U)²/n)
b. €(x-U)/n
19
20. What is the interquartile range of the following dataset: {3,5,7,9,11,13,15}?
b. 6
a. 4
d. 10
c. 8
20
2. What is the median of the following dataset: { 3, 6, 9, 12, 15} ?
a. 6
d. 12
b. 9
c. 10
21
1. What is the mean of the following dataset: {5, 7, 9, 11, 13} ?
a. 8
b. 9
d. 11
c. 10
22
In a normal distribution, what percentage of data falls with one standard deviation from the mean?
b. 50%
a. 25%
d. 95%
c. 68%
23
25. What is the formula for calculating the probabability of an event in a uniform distribution?
a. (b-a) /n
d. (b+a) /2
b. (b+a) /n
c. (b-a) /2
24
14. In a normal distribution, what is the standard deviation of the distribution called?
d. Variance
b. Median
a. Mean
c. Mode
25
19. In a binomial distribution,what does 'p' represent?
d. Probability of success
a. Mean
c. Number of trials
b. Standard deviation
