Question 1

For the standard normal distribution,the area between z = 0 and z = -1.38,rounded to four decimal places,is:

Accepted Answer

The answer of For the standard normal distribution,the area between...

Question 2

Which of the following is not a characteristic of the normal distribution?

Accepted Answer

A) The total area under the curve is 1.0 
B) The curve is symmetric about the mean 
C) The value of the mean is always greater than the value of the standard deviation 
D) The two tails of the curve extend indefinitely 
A) The total area under the curve is 1.0 
B) The curve is symmetric about the mean 
C) The value of the mean is always greater than the value of the standard deviation 
D) The two tails of the curve extend indefinitely

Question 3

Use the following to answer questions :
The net weights of all boxes of Top Taste cookies produce a distribution that is approximately normal with a mean of 31.74 and a standard deviation of 0.58.
-The probability that the net weight of a randomly selected box of these cookies is less than 31.58 ounces,rounded to four decimal places,is:

Accepted Answer

The answer of Use the following to answer questions :
The...

Question 4

Let x be a continuous random variable that follows a normal distribution with a mean of 226 and a standard deviation of 31.
Find the value of x so that the area under the normal curve between   and x is approximately 0.4959 and the value of x is less than   .Round your answer to two decimal places.

Accepted Answer

The answer of Let x be a continuous random variable...

Question 5

For the standard normal distribution,the area to the left of z = 1.23,rounded to four decimal places,is:

Accepted Answer

The answer of For the standard normal distribution,the area to...

Question 6

For the standard normal distribution,the area between z = 1.03 and z = 1.30,rounded to four decimal places,is:

Accepted Answer

The answer of For the standard normal distribution,the area between...

Question 7

For a normal curve,changing the mean from 35 to 46 will cause the curve to shift

Accepted Answer

A) to the left. 
B) to the right. 
C) up. 
D) down. 
A) to the left. 
B) to the right. 
C) up. 
D) down.

Question 8

Use the following to answer questions :
The heights of all female college basketball players produce a distribution that is approximately normal with a mean of 67.55 and a standard deviation of 2.02.
-The probability that the height of a randomly selected female college basketball player is less than 67.2 inches,rounded to four decimal places,is:

Accepted Answer

The answer of Use the following to answer questions :
The...

Question 9

For a continuous random variable x,the area under the probability distribution curve between any two points is always:

Accepted Answer

A) greater than 1 
B) less than zero 
C) equal to 1 
D) in the range zero to 1 
A) greater than 1 
B) less than zero 
C) equal to 1 
D) in the range zero to 1

Question 10

Use the following to answer questions :
The net weights of all boxes of Top Taste cookies produce a distribution that is approximately normal with a mean of 31.74 and a standard deviation of 0.58.
-The probability that the net weight of a randomly selected box of these cookies is between 31.8 and 32.5 ounces,rounded to four decimal places,is:

Accepted Answer

The answer of Use the following to answer questions :
The...

Question 11

You are given that the area under the standard normal curve to the left of z = -2.56 is equal to 0.0052.What is P(-2.56< z < 2.56)?

Accepted Answer

The answer of You are given that the area under...

Question 12

The relative frequency density for a class is obtained by dividing the:

Accepted Answer

A) frequency of that class by the class width 
B) relative frequency of that class by the total frequency 
C) relative frequency of that class by the class width 
D) frequency of that class by the relative frequency 
A) frequency of that class by the class width 
B) relative frequency of that class by the total frequency 
C) relative frequency of that class by the class width 
D) frequency of that class by the relative frequency

Question 13

Let x have a normal distribution with a mean of 49.2 and a standard deviation of 4.90.The z value for x = 56.05,rounded to two decimal places,is:

Accepted Answer

The answer of Let x have a normal distribution with...

Question 14

There are 250 players in a particular youth soccer league that has 11 teams.The league statistician is tabulating the total goals scored over the past season by each player.She assigns the random variable y to represent these totals,and then assigns the following categories for y: 0 to less than 4,4 to less than 8,8 to less than 12,12 to less than 16,16 to less than 20,and 20 to less than 24.The relative frequency density for the 8 to less than 12 class is 0.019.How many of the players scored between 8 and less than 12 goals?

Accepted Answer

The answer of There are 250 players in a particular...

Question 15

Let x have a normal distribution with a mean of 123.7 and a standard deviation of 6.01.The z value for x = 133.67,rounded to two decimal places,is:

Accepted Answer

The answer of Let x have a normal distribution with...

Question 16

Use the following to answer questions :
The daily sales at a convenience store produce a distribution that is approximately normal with a mean of 1220 and a standard deviation of 130.
-The probability that the sales on a given day at this store are more than $1,405,rounded to four decimal places,is:

Accepted Answer

The answer of Use the following to answer questions :
The...

Question 17

As explained in the textbook,the normal distribution can be used as an approximation to the binomial distribution when np > 5 and nq > 5.Let x be the number of times that heads comes up in n flips of a coin for which the probability of a head is p = 0.152.What is the lowest that n can be in order for us to use the normal approximation for the distribution of x?

Accepted Answer

The answer of As explained in the textbook,the normal distribution...

Question 18

The accountant at a department store is analyzing the credit card purchases of 100 of the store's cardholders over the past year.The following table lists the frequency distribution of the continuous random variable x,annual credit card purchases.
   What is the relative frequency density of the 400 to less than 600 class? Round your answer to 5 decimal places.

Accepted Answer

The answer of The accountant at a department store is...

Question 19

The area under the standard normal curve from zero to z is 0.4906 and z is positive.The value of z is:

Accepted Answer

The answer of The area under the standard normal curve...

Question 20

For a normal distribution,the z value for an x value that is to the left of the mean is always:

Accepted Answer

A) equal to zero 
B) negative 
C) less than 1 
D) positive 
A) equal to zero 
B) negative 
C) less than 1 
D) positive

For the standard normal distribution,the area between z = 0 and z = -1.38,rounded to four decimal places,is:

Which of the following is not a characteristic of the normal distribution?

Let x be a continuous random variable that follows a normal distribution with a mean of 226 and a standard deviation of 31. Find the value of x so that the area under the normal curve between and x is approximately 0.4959 and the value of x is less than .Round your answer to two decimal places.

For the standard normal distribution,the area to the left of z = 1.23,rounded to four decimal places,is:

For the standard normal distribution,the area between z = 1.03 and z = 1.30,rounded to four decimal places,is:

For a normal curve,changing the mean from 35 to 46 will cause the curve to shift

For a continuous random variable x,the area under the probability distribution curve between any two points is always:

You are given that the area under the standard normal curve to the left of z = -2.56 is equal to 0.0052.What is P(-2.56< z < 2.56)?

The relative frequency density for a class is obtained by dividing the:

Let x have a normal distribution with a mean of 49.2 and a standard deviation of 4.90.The z value for x = 56.05,rounded to two decimal places,is:

Let x have a normal distribution with a mean of 123.7 and a standard deviation of 6.01.The z value for x = 133.67,rounded to two decimal places,is:

Use the following to answer questions : The daily sales at a convenience store produce a distribution that is approximately normal with a mean of 1220 and a standard deviation of 130. -The probability that the sales on a given day at this store are more than $1,405,rounded to four decimal places,is:

The area under the standard normal curve from zero to z is 0.4906 and z is positive.The value of z is:

For a normal distribution,the z value for an x value that is to the left of the mean is always:

Introduction

Organizing and Graphing Data

Numerical Descriptive Measures

Probability

Discrete Random Variables and Their Probability Distribution

Sampling Distributions

Estimation of the Mean and Proportion

Hypothesis Tests About the Mean and Proportion

Estimation and Hypothesis Testing: Two Populations

Chi-Square Tests

Analysis of Variance

Simple Linear Regression

Filters

Exam 6: Continuous Random Variables and the Normal Distribution

For the standard normal distribution,the area between z = 0 and z = -1.38,rounded to four decimal places,is:

Which of the following is not a characteristic of the normal distribution?

Let x be a continuous random variable that follows a normal distribution with a mean of 226 and a standard deviation of 31. Find the value of x so that the area under the normal curve between and x is approximately 0.4959 and the value of x is less than .Round your answer to two decimal places.

For the standard normal distribution,the area to the left of z = 1.23,rounded to four decimal places,is:

For the standard normal distribution,the area between z = 1.03 and z = 1.30,rounded to four decimal places,is:

For a normal curve,changing the mean from 35 to 46 will cause the curve to shift

For a continuous random variable x,the area under the probability distribution curve between any two points is always:

You are given that the area under the standard normal curve to the left of z = -2.56 is equal to 0.0052.What is P(-2.56< z < 2.56)?

The relative frequency density for a class is obtained by dividing the:

Let x have a normal distribution with a mean of 49.2 and a standard deviation of 4.90.The z value for x = 56.05,rounded to two decimal places,is:

Let x have a normal distribution with a mean of 123.7 and a standard deviation of 6.01.The z value for x = 133.67,rounded to two decimal places,is:

The area under the standard normal curve from zero to z is 0.4906 and z is positive.The value of z is:

For a normal distribution,the z value for an x value that is to the left of the mean is always:

Introduction

Organizing and Graphing Data

Numerical Descriptive Measures

Probability

Discrete Random Variables and Their Probability Distribution

Sampling Distributions

Estimation of the Mean and Proportion

Hypothesis Tests About the Mean and Proportion

Estimation and Hypothesis Testing: Two Populations

Chi-Square Tests

Analysis of Variance

Simple Linear Regression

Filters