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Test Bank 2
Multiple Choice
30
Other
11/01/2011

Term
 A jar contains 10 red marbles and 30 blue marbles. What is the probability of randomly selecting a red marblefrom the jar?
Definition
 b. 10/40
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
 c. 10/40
Term
 In an introductory psychology class with n = 50 students, there are 9 freshman males, 15 freshman females, 8sophomore males, 12 sophomore females, and 6 junior females. If one student is randomly selected from thisclass, what is the probability of getting a sophomore?
Definition
 d. 20/50
Term
 In an introductory psychology class with n = 50 students, there are 9 freshman males, 15 freshman females, 8sophomore males, 12 sophomore females and 6 junior females. A random sample of n = 2 students is selectedfrom the class. If the first student in the sample is a male, what is the probability that the second student willalso be a male?
Definition
 d. 17/50
Term
 What proportion of a normal distribution is located in the tail beyond z = 2.00?
Definition
 b. 0.0228
Term
 What proportion of a normal distribution is located in the tail beyond z = -1.00?
Definition
 b. 0.1587
Term
 What proportion of a normal distribution is located between the mean and z = -0.40?
Definition
 c. 0.1554
Term
 A vertical line is drawn through a normal distribution at z = 0.80. What proportion of the distribution is on theright-hand side of the line?
Definition
 b. 0.2119
Term
 A vertical line is drawn through a normal distribution at z = 1.20. What proportion of the distribution is on theleft-hand side of the line?
Definition
 a. 0.8849
Term
 10. What proportion of a normal distribution is located between z = -0.25 and z = +0.25?
Definition
 d. 0.1974
Term
 What proportion of a normal distribution is located between z = 1.00 and z = 1.50?
Definition
 a. 0.0919
Term
 What is the probability of randomly selecting a z-score greater than z = 0.75 from a normal distribution?
Definition
 b. 0.2266
Term
 What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution?
Definition
 a. 0.8944
Term
 What z-score value separates the top 70% of a normal distribution from the bottom30%?
Definition
 c. z = -0.52
Term
 A normal distribution has a mean of m = 40 with s = 10. What proportion of the scores in this distribution aregreater than X = 55?
Definition
 c. 0.0668
Term
 A normal distribution has a mean of m = 40 with s = 10. What proportion of the scores in this distribution aresmaller than X = 35?
Definition
 a. 0.3085
Term
 A normal distribution has a mean of m = 80 with s = 20. What score separates the highest 15% of thedistribution from the rest of the scores?
Definition
 b. X = 100.8
Term
 A normal distribution has a mean of m = 80 with s = 20. What score separates the highest 40% of thedistribution from the rest of the scores?
Definition
 b. X = 85
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
 b. X = 27.24
Term
 John drives to work each morning and the trip takes an average of m = 38 minutes. The distribution of drivingtimes 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
 d. 0.2743
Term
 John drives to work each morning and the trip takes an average of m = 38 minutes. The distribution of drivingtimes 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
 d. 0.3108
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 errorwould be expected between the sample mean and the population mean?
Definition
 c. 4 points
Term
 What symbol is used to identify the standard error of M?
Definition
 a. sM
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 definitelywill be normal?
Definition
 d. Neither the sample, the population, nor the distribution of sample means will definitelybe normal.
Term
 A random sample of n = 36 scores is selected from a population. Which of the following distributionsdefinitely 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 thedistribution of sample means?
Definition
 c. 4
Term
 If random samples, each with n = 9 scores, are selected from a normal population with m = 80 and s = 36, thenwhat is the expected value for the distribution of sample means?
Definition
 d. 80
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