Question 1

If the value of Z is z = 99, that means you are at the 99th percentile on the Z distribution.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is true for an exponential distribution with parameter $\lambda$?

Accepted Answer

A)  $\mu$ = 1/$\lambda$ 
B)  $\sigma$ = 1/$\lambda$ 
C)  The Y-intercept of f(x) is$\lambda$. 
D)  All of these choices are true. 
A)  $\mu$ = 1/$\lambda$ 
B)  $\sigma$ = 1/$\lambda$ 
C)  The Y-intercept of f(x) is$\lambda$. 
D)  All of these choices are true.

Question 3

Suppose Lamont's exam score was at the 80th percentile on an exam whose mean was 90.What was Lamont's exam score?

Accepted Answer

A)  76.81 
B)  72.00 
C)  80.00 
D)  Cannot tell without more information. 
A)  76.81 
B)  72.00 
C)  80.00 
D)  Cannot tell without more information.

Question 4

The mean and the variance of an exponential distribution are equal to each other.

Accepted Answer

A) True 
 B)False

Question 5

Waiting Time
The length of time patients must wait to see a doctor at an emergency room in a large hospital has a uniform distribution between 40 minutes and 3 hours.
-{Waiting Time Narrative} What is the probability that a patient would have to wait no more than one hour?

Accepted Answer

The answer of Waiting Time
The length of time patients must...

Question 6

The probability density function of a uniform random variable on the interval [0, 5] must be ____________________ for 0 $\le$x $\le$5.

Accepted Answer

The answer of The probability density function of a uniform...

Question 7

The shape of the density function for an exponential distribution is ____________________.

Accepted Answer

skewed
pos

Question 8

The number of parameters for an F distribution is:

Accepted Answer

A)  1 
B)  2 
C)  0 
D)  None of these choices. 
A)  1 
B)  2 
C)  0 
D)  None of these choices.

Question 9

The y-intercept of the density function for an exponential distribution with parameter 10 is ____________________.

Accepted Answer

The answer of The y-intercept of the density function for...

Question 10

Subway Waiting Time
At a subway station the waiting time for a subway is found to be uniformly distributed between 1 and 5 minutes.
-{Subway Waiting Time Narrative} What is the probability that the subway arrives in the first minute and a half?

Accepted Answer

The answer of Subway Waiting Time
At a subway station the...

Question 11

P(Z > 3.00) is approximately ____________________.

Accepted Answer

The answer of P(Z > 3.00) is approximately ____________________....

Question 12

Use the c2 table to find the following probabilities.
a.
b.
c.
d.

Accepted Answer

a.
0.900
b

Question 13

The value of A such that P(-A $\le$ t $\le$ A) = 0.95, where the degrees of freedom are 20, is 2.086.

Accepted Answer

A) True 
 B)False

Question 14

Calculus Scores
Scores of high school students on a national calculus exam were normally distributed with a mean of 86 and a standard deviation of 4.(Total possible points = 100.)
-{Calculus Scores Narrative} What is the probability that a randomly selected student will have a score between 80 and 90?

Accepted Answer

The answer of Calculus Scores
Scores of high school students on...

Question 15

The value of an F distribution with v1 = 5 and v2 = 10 degrees of freedom such that the area to its left is 0.95 is 3.33.

Accepted Answer

A) True 
 B)False

Question 16

For values of degrees of freedom greater than 100, the c2 distribution can be approximated by a(n) ____________________ distribution.

Accepted Answer

Question 17

If the random variable X is exponentially distributed with parameter $\lambda$ = 2, then the probability that X is between 1 and 2 equals the probability that X is between 2 and 3.

Accepted Answer

A) True 
 B)False

Question 18

Repair Time
The time it takes a technician to fix a telephone problem is exponentially distributed with a mean of 15 minutes.
-{Repair Time Narrative} What is the probability that it will take a technician between 10 to 15 minutes to fix a telephone problem?

Accepted Answer

The answer of Repair Time
The time it takes a technician...

Question 19

A larger standard deviation of a normal distribution indicates that the distribution becomes:

Accepted Answer

A)  narrower and more peaked. 
B)  flatter and wider. 
C)  more skewed to the right. 
D)  more skewed to the left. 
A)  narrower and more peaked. 
B)  flatter and wider. 
C)  more skewed to the right. 
D)  more skewed to the left.

Question 20

P(1 < Z < 2) = P(Z < 2)-____________________.

Accepted Answer

The answer of P(1 < Z < 2) = P(Z...

If the value of Z is z = 99, that means you are at the 99th percentile on the Z distribution.

Which of the following is true for an exponential distribution with parameter $\lambda$ ?

Suppose Lamont's exam score was at the 80^th percentile on an exam whose mean was 90.What was Lamont's exam score?

The mean and the variance of an exponential distribution are equal to each other.

Waiting Time The length of time patients must wait to see a doctor at an emergency room in a large hospital has a uniform distribution between 40 minutes and 3 hours. -{Waiting Time Narrative} What is the probability that a patient would have to wait no more than one hour?

The probability density function of a uniform random variable on the interval [0, 5] must be ____________________ for 0 $\le$ x $\le$ 5.

The shape of the density function for an exponential distribution is ____________________.

The number of parameters for an F distribution is:

The y-intercept of the density function for an exponential distribution with parameter 10 is ____________________.

Subway Waiting Time At a subway station the waiting time for a subway is found to be uniformly distributed between 1 and 5 minutes. -{Subway Waiting Time Narrative} What is the probability that the subway arrives in the first minute and a half?

P(Z > 3.00) is approximately ____________________.

Use the c² table to find the following probabilities. a. b. c. d.

The value of A such that P(-A $\le$ t $\le$ A) = 0.95, where the degrees of freedom are 20, is 2.086.

The value of an F distribution with v₁ = 5 and v₂ = 10 degrees of freedom such that the area to its left is 0.95 is 3.33.

For values of degrees of freedom greater than 100, the c² distribution can be approximated by a(n) ____________________ distribution.

If the random variable X is exponentially distributed with parameter $\lambda$ = 2, then the probability that X is between 1 and 2 equals the probability that X is between 2 and 3.

Repair Time The time it takes a technician to fix a telephone problem is exponentially distributed with a mean of 15 minutes. -{Repair Time Narrative} What is the probability that it will take a technician between 10 to 15 minutes to fix a telephone problem?

A larger standard deviation of a normal distribution indicates that the distribution becomes:

P(1 < Z < 2) = P(Z < 2)-____________________.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 8: Continuous Probability Distributions

If the value of Z is z = 99, that means you are at the 99th percentile on the Z distribution.

Which of the following is true for an exponential distribution with parameter λ\lambdaλ ?

Suppose Lamont's exam score was at the 80th percentile on an exam whose mean was 90.What was Lamont's exam score?

The mean and the variance of an exponential distribution are equal to each other.

Waiting Time The length of time patients must wait to see a doctor at an emergency room in a large hospital has a uniform distribution between 40 minutes and 3 hours. -{Waiting Time Narrative} What is the probability that a patient would have to wait no more than one hour?

The probability density function of a uniform random variable on the interval [0, 5] must be ____________________ for 0 ≤\le≤ x ≤\le≤ 5.

The shape of the density function for an exponential distribution is ____________________.

The number of parameters for an F distribution is:

The y-intercept of the density function for an exponential distribution with parameter 10 is ____________________.

Subway Waiting Time At a subway station the waiting time for a subway is found to be uniformly distributed between 1 and 5 minutes. -{Subway Waiting Time Narrative} What is the probability that the subway arrives in the first minute and a half?

P(Z > 3.00) is approximately ____________________.

Use the c2 table to find the following probabilities. a. b. c. d.

The value of A such that P(-A ≤\le≤ t ≤\le≤ A) = 0.95, where the degrees of freedom are 20, is 2.086.

The value of an F distribution with v1 = 5 and v2 = 10 degrees of freedom such that the area to its left is 0.95 is 3.33.

For values of degrees of freedom greater than 100, the c2 distribution can be approximated by a(n) ____________________ distribution.

If the random variable X is exponentially distributed with parameter λ\lambdaλ = 2, then the probability that X is between 1 and 2 equals the probability that X is between 2 and 3.

Repair Time The time it takes a technician to fix a telephone problem is exponentially distributed with a mean of 15 minutes. -{Repair Time Narrative} What is the probability that it will take a technician between 10 to 15 minutes to fix a telephone problem?

A larger standard deviation of a normal distribution indicates that the distribution becomes:

P(1 < Z < 2) = P(Z < 2)-____________________.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

Which of the following is true for an exponential distribution with parameter $\lambda$ ?

Suppose Lamont's exam score was at the 80^th percentile on an exam whose mean was 90.What was Lamont's exam score?

The probability density function of a uniform random variable on the interval [0, 5] must be ____________________ for 0 $\le$ x $\le$ 5.

Use the c² table to find the following probabilities. a. b. c. d.

The value of A such that P(-A $\le$ t $\le$ A) = 0.95, where the degrees of freedom are 20, is 2.086.

The value of an F distribution with v₁ = 5 and v₂ = 10 degrees of freedom such that the area to its left is 0.95 is 3.33.

For values of degrees of freedom greater than 100, the c² distribution can be approximated by a(n) ____________________ distribution.

If the random variable X is exponentially distributed with parameter $\lambda$ = 2, then the probability that X is between 1 and 2 equals the probability that X is between 2 and 3.