Exhibit 8-3 A random sample of 81 automobiles traveling on a section of an interstate showed...
Exhibit 8-3
A random sample of 81 automobiles traveling on a section of an
interstate showed an average speed of 60 mph. The distribution of
speeds of all cars on this section of highway is normally
distributed, with a standard deviation of 13.5 mph.
Refer to Exhibit 8-3. If the sample size was 25 (other factors
remain unchanged), the interval for μ would _____.
Group of answer choices
become wider
become zero
become narrower
not change
Homework Answers
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Exhibit 8-3
A random sample of 81 automobiles traveling on a section of an
interstate showed...
A random sample of 121 automobiles traveling on an interstate showed an average speed of 65...
A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. Refer to Exhibit 8-2. The standard error of the mean is
1. A random sample of 400 automobiles traveling on an interstate showed an average speed of...
1. A random sample of 400 automobiles traveling on an interstate showed an average speed of 100 mph. From past information, it is known that the standard deviation of the population is 45 mph. What is the confidence interval given a 90% confidence level? a) b) c) d) 95.6 < p < 104.4 96.3< 103.7 94.2 < u < 105.8 92.2 < u < 107.8
The following is the frequency distribution for the speeds of a sample of automobiles traveling on...
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. Speed (mph) Frequency 50 - 54 2 55 - 59 4 60 - 64 5 65 - 69 10 70 - 74 9 75 - 79 5 35 The standard deviation is a.6.969 b.7.071 c.48.570 d.50.000
attempts apters Score ! . Sect . Problem Exhibit 3 Arandom sample of automobiles traveling on...
attempts apters Score ! . Sect . Problem Exhibit 3 Arandom sample of automobiles traveling on e of thowed we speed of the distino pods of this action of this may be cod e interval fois Refer Exhibit 1. The 46.500 73.500 9.13106 De 30 10 20 57.73563265
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corpora...
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corporation provided the following information 25 32 26 54 22 23 Determine the point estimate for the average age of all employees. What is the point estimate for the standard deviation of the population? Determine a point estimate for the proportion of all employees who...
1. A police officer is concerned about speeds on a certain section of Interstate 95. The data acc...
1. A police officer is concerned about speeds on a certain
section of Interstate 95. The data accompanying this exercise show
the speeds of 40 cars on a Saturday afternoon.
a. The speed limit on this portion of
Interstate 95 is 66 mph. Specify the competing hypotheses in order
to determine if the average speed is greater than the speed
limit.
H0: μ = 66;
HA: μ ≠ 66
H0: μ ≥ 66;
HA: μ < 66
H0: μ ≤...
Test No. 3 ( (Form B)Math 100 Spring 2019 I. Multiple-choice (Circle the letter of your...
Test No. 3 ( (Form B)Math 100 Spring 2019 I. Multiple-choice (Circle the letter of your answer): Questions No. 1 through No. 5 refer to the following: A continuous s has a normal distribution with the mean of 80 and standard deviation of 15 random variable x (1) The mode of the variable s is A 80 (B) 15 (C) 40 (D) Unknown (2) The z-score for the mode of x : (A) I (3) The p (B) 0.S ity...
1. A random sample of 400 automobiles traveling on an interstate showed an average speed of 100 mph. From past information, it is known that the standard deviation of the population is 45 mph. What is the confidence interval given a 90% confidence level? a) b) c) d) 95.6 < p < 104.4 96.3< 103.7 94.2 < u < 105.8 92.2 < u < 107.8
attempts apters Score ! . Sect . Problem Exhibit 3 Arandom sample of automobiles traveling on e of thowed we speed of the distino pods of this action of this may be cod e interval fois Refer Exhibit 1. The 46.500 73.500 9.13106 De 30 10 20 57.73563265
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corporation provided the following information 25 32 26 54 22 23 Determine the point estimate for the average age of all employees. What is the point estimate for the standard deviation of the population? Determine a point estimate for the proportion of all employees who...
1. A police officer is concerned about speeds on a certain
section of Interstate 95. The data accompanying this exercise show
the speeds of 40 cars on a Saturday afternoon.
a. The speed limit on this portion of
Interstate 95 is 66 mph. Specify the competing hypotheses in order
to determine if the average speed is greater than the speed
limit.
H0: μ = 66;
HA: μ ≠ 66
H0: μ ≥ 66;
HA: μ < 66
H0: μ ≤...
Test No. 3 ( (Form B)Math 100 Spring 2019 I. Multiple-choice (Circle the letter of your answer): Questions No. 1 through No. 5 refer to the following: A continuous s has a normal distribution with the mean of 80 and standard deviation of 15 random variable x (1) The mode of the variable s is A 80 (B) 15 (C) 40 (D) Unknown (2) The z-score for the mode of x : (A) I (3) The p (B) 0.S ity...
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