Term
A jar contains 10 red marbles and 30 blue marbles. What is the probability of randomly selecting a red marble
from the jar? |
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Definition
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Term
A jar contains 10 red marbles and 30 blue marbles. A random sample of n = 3 marbles is selected from the jar.
If the first two marbles are both blue, what is the probability that the third marble will be red? |
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Definition
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Term
In an introductory psychology class with n = 50 students, there are 9 freshman males, 15 freshman females, 8
sophomore males, 12 sophomore females, and 6 junior females. If one student is randomly selected from this
class, what is the probability of getting a sophomore? |
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Definition
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Term
In an introductory psychology class with n = 50 students, there are 9 freshman males, 15 freshman females, 8
sophomore males, 12 sophomore females and 6 junior females. A random sample of n = 2 students is selected
from the class. If the first student in the sample is a male, what is the probability that the second student will
also be a male? |
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Definition
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Term
| What proportion of a normal distribution is located in the tail beyond z = 2.00? |
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Definition
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Term
| What proportion of a normal distribution is located in the tail beyond z = -1.00? |
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Definition
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Term
| What proportion of a normal distribution is located between the mean and z = -0.40? |
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Definition
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Term
A vertical line is drawn through a normal distribution at z = 0.80. What proportion of the distribution is on the
right-hand side of the line? |
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Definition
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Term
A vertical line is drawn through a normal distribution at z = 1.20. What proportion of the distribution is on the
left-hand side of the line? |
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Definition
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Term
| 10. What proportion of a normal distribution is located between z = -0.25 and z = +0.25? |
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Definition
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Term
| What proportion of a normal distribution is located between z = 1.00 and z = 1.50? |
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Definition
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Term
| What is the probability of randomly selecting a z-score greater than z = 0.75 from a normal distribution? |
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Definition
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Term
| What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution? |
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Definition
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Term
What z-score value separates the top 70% of a normal distribution from the bottom
30%? |
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Definition
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Term
A normal distribution has a mean of m = 40 with s = 10. What proportion of the scores in this distribution are
greater than X = 55? |
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Definition
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Term
A normal distribution has a mean of m = 40 with s = 10. What proportion of the scores in this distribution are
smaller than X = 35? |
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Definition
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Term
A normal distribution has a mean of m = 80 with s = 20. What score separates the highest 15% of the
distribution from the rest of the scores? |
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Definition
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Term
A normal distribution has a mean of m = 80 with s = 20. What score separates the highest 40% of the
distribution from the rest of the scores? |
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Definition
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Term
A normal distribution has a mean of m = 24 with s = 3. What is the minimum score needed to be in the top 14%
of the distribution? |
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Definition
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Term
John drives to work each morning and the trip takes an average of m = 38 minutes. The distribution of driving
times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning,
what is the probability that John's drive to work will take less than 35 minutes? |
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Definition
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Term
John drives to work each morning and the trip takes an average of m = 38 minutes. The distribution of driving
times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning,
what is the probability that John's drive to work will take between 36 and 40 minutes? |
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Definition
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Term
| What term is used to identify the mean of the distribution of sample means? |
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Definition
| a. the expected value of M |
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Term
| What term is used to identify the standard deviation of the distribution of sample means? |
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Definition
| b. the standard error of M |
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Term
A sample of n = 25 scores is selected from a population with m = 100 with s = 20. On average, how much error
would be expected between the sample mean and the population mean? |
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Definition
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Term
| What symbol is used to identify the standard error of M? |
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Definition
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Term
| Under what circumstances will the distribution of sample means be normal? |
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Definition
| d. If the population is normal or if the sample size is greater than 30. |
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Term
A random sample of n = 4 scores is selected from a population. Which of the following distributions definitely
will be normal? |
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Definition
d. Neither the sample, the population, nor the distribution of sample means will definitely
be normal. |
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Term
A random sample of n = 36 scores is selected from a population. Which of the following distributions
definitely will be normal? |
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Definition
| c. The distribution of sample means will form a normal distribution. |
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Term
Samples of size n = 4 are selected from a population with m = 80 with s = 8. What is the standard error for the
distribution of sample means? |
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Definition
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Term
If random samples, each with n = 9 scores, are selected from a normal population with m = 80 and s = 36, then
what is the expected value for the distribution of sample means? |
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Definition
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