. Assume that, for a given test, the population mean is µ=50 and the population standard deviation is σ=10. What is the probability that your sample mean will be 54 or higher, if you have a randomly drawn sample size of n=25?
1. Assume that, for a given test, the population mean is µ=50 and the population standard deviation is σ=10. What is the
2. IQ scores have a mean of µ=100 in the general population, and have a standard deviation of σ=15. You take a random sample of n=25 people. What is the probability that your sample mean will be M=106 or greater?
3. IQ scores have a mean of µ=100 in the general population, and have a standard deviation of σ=15. You drew a random sample of 25 people. Which of these possible results would occur approximately 5% of the time?
4. Which of the following statements about the relationship between the population standard deviation and the standard error is true?
a. The larger the standard error becomes, the smaller the population standard error becomes
b. The larger the sample size becomes, the larger the population mean becomes
c. The larger the population standard deviation becomes, the smaller the standard error becomes
d. The larger the sample size becomes, the smaller the standard error becomes
5. Assume that, for a given test, the population mean is µ=50 and the population standard deviation is σ=10. What is the probability that your sample mean will be 54 or higher, if you have a randomly drawn sample size of n=4?
6. What sample size (n=?) is necessary to get a standard error of 2, if the population standard deviation is σ=20?
7. For a population with a standard deviation of σ = 20, how large a sample is necessary to have a standard error that is equal to 5 points?
8. IQ scores have a mean of µ=100 in the general population, and have a standard deviation of σ=15. You take a random sample of n=9 people. What is the probability that your sample mean will be M=95 or less?
9.
If you wanted your study to have a smaller standard error, which of these would be a good idea?
Use |
||
Use a random sample |
||
Increase your population standard deviation |
||
Increase sample size |
10. If you have a sample of n=25, what is the standard error if the population standard deviation is σ = 60?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps