Quiz Stat
Name: [pic]_________________________
1. Two events are complementary when
A) the sum of their probabilities is one. B) the joint probability of the two events is one. C) they are mutually exclusive. D) None of the above.
2. Are Service provider and county independent events?
A) Yes. B) No. C) Insufficient information to determine.
3. A random variable is a function or rule that assigns a numerical value to each outcome in the sample space of a stochastic experiment.
True
A) False
4. A probability distribution
A) is a listing of all possible values of a random variable. B) is a listing of all possible values of a random variable, along with their probabilities. C) can assume values between -1 and +1. D) has none of the above properties.
5. For a continuous random variable, the total area beneath the probability distribution curve will be greater than 0 but less than 1.
A) True
False
6. The standardized normal distribution always has a mean of zero and a standard deviation of one.
True
A) False
7. Excel’s RAND() function produces random numbers that are uniformly distributed from 0 to 1. The standard deviation of this distribution is about
A) .5000 B) .2500 C) .3333 D) .2887
8. The expected value of an unbiased estimator is equal to the parameter whose value is being estimated.
True
A) False
[pic] 9. All estimators are biased since sampling errors always exist to some extent.
A) True
False
10. The Central Limit Theorem says that, if n exceeds 30, a histogram of the sample will have a bell-shape, even if the population isn't normal.
A) True
False
11. The distribution of the sample proportion p=x/n is normal when n >/- 30.
A) True
False
12. The standard error
1. Two events are complementary when
A) the sum of their probabilities is one. B) the joint probability of the two events is one. C) they are mutually exclusive. D) None of the above.
2. Are Service provider and county independent events?
A) Yes. B) No. C) Insufficient information to determine.
3. A random variable is a function or rule that assigns a numerical value to each outcome in the sample space of a stochastic experiment.
True
A) False
4. A probability distribution
A) is a listing of all possible values of a random variable. B) is a listing of all possible values of a random variable, along with their probabilities. C) can assume values between -1 and +1. D) has none of the above properties.
5. For a continuous random variable, the total area beneath the probability distribution curve will be greater than 0 but less than 1.
A) True
False
6. The standardized normal distribution always has a mean of zero and a standard deviation of one.
True
A) False
7. Excel’s RAND() function produces random numbers that are uniformly distributed from 0 to 1. The standard deviation of this distribution is about
A) .5000 B) .2500 C) .3333 D) .2887
8. The expected value of an unbiased estimator is equal to the parameter whose value is being estimated.
True
A) False
[pic] 9. All estimators are biased since sampling errors always exist to some extent.
A) True
False
10. The Central Limit Theorem says that, if n exceeds 30, a histogram of the sample will have a bell-shape, even if the population isn't normal.
A) True
False
11. The distribution of the sample proportion p=x/n is normal when n >/- 30.
A) True
False
12. The standard error