Term
A jar contains 10 red marbles and 30 blue marbles. What is the probability of randomly selecting a red marble from the jar? 

Definition


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? 

Definition


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? 

Definition


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? 

Definition


Term
What proportion of a normal distribution is located in the tail beyond z = 2.00? 

Definition


Term
What proportion of a normal distribution is located in the tail beyond z = 1.00? 

Definition


Term
What proportion of a normal distribution is located between the mean and z = 0.40? 

Definition


Term
A vertical line is drawn through a normal distribution at z = 0.80. What proportion of the distribution is on the righthand side of the line? 

Definition


Term
A vertical line is drawn through a normal distribution at z = 1.20. What proportion of the distribution is on the lefthand side of the line? 

Definition


Term
10. What proportion of a normal distribution is located between z = 0.25 and z = +0.25? 

Definition


Term
What proportion of a normal distribution is located between z = 1.00 and z = 1.50? 

Definition


Term
What is the probability of randomly selecting a zscore greater than z = 0.75 from a normal distribution? 

Definition


Term
What is the probability of randomly selecting a zscore less than z = 1.25 from a normal distribution? 

Definition


Term
What zscore value separates the top 70% of a normal distribution from the bottom 30%? 

Definition


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? 

Definition


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? 

Definition


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? 

Definition


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? 

Definition


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? 

Definition


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? 

Definition


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? 

Definition


Term
What term is used to identify the mean of the distribution of sample means? 

Definition
a. the expected value of M 


Term
What term is used to identify the standard deviation of the distribution of sample means? 

Definition
b. the standard error of M 


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? 

Definition


Term
What symbol is used to identify the standard error of M? 

Definition


Term
Under what circumstances will the distribution of sample means be normal? 

Definition
d. If the population is normal or if the sample size is greater than 30. 


Term
A random sample of n = 4 scores is selected from a population. Which of the following distributions definitely will be normal? 

Definition
d. Neither the sample, the population, nor the distribution of sample means will definitely be normal. 


Term
A random sample of n = 36 scores is selected from a population. Which of the following distributions definitely will be normal? 

Definition
c. The distribution of sample means will form a normal distribution. 


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? 

Definition


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? 

Definition

