USA Today reports that the average expenditure on Valentine's Day was expected to be $100.89. Do male and female consumers differ in the amountsthey spend? The average expenditure in a sample survey of 60 male consumers was $133.15, and the average expenditure in a sample survey of 37female consumers was $60.72. Based on past surveys, the standard deviation for male consumers is assumed to be $31, and the standard deviation forfemale consumers is assumed to be $18. The z value is 2.576.Round your answers to 2 decimal places.a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females?b. At 99% confidence, what is the margin of error?c. Develop a 99% confidence interval for the difference between the two population means.to

Given that Sample sizes n1=60 , n2=37 Sample means X̄1=133.15 , X̄2= 60.72 ?1 =31…

Answered: reports that the average expenditure on…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The mean Math ACT score was 20.5, with a standard deviation of 5.5. Sarah scored a 26 on the Math ACT. According to the empirical rule, what percent of students taking the Math ACT scored higher than Sarah? O 5.5% O 16% O 84% O 2.5%
USA Today reports that the average expenditure on Valentine's Day was expected to be $100.89. Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 54 male consumers was $132.57, and the average expenditure in a sample survey of 35 female consumers was $70. Based on past surveys, the standard deviation for male consumers is assumed to be $33, and the standard deviation for female consumers is assumed to be $16. The z value is 2.576. Round your answers to 2 decimal places. a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females? b. At 99% confidence, what is the margin of error? c. Develop a 99% confidence interval for the difference between the two population means. to
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An instructor claims that the average number of hours needed to study for a final exam in order to pass should be 5 hours. A student believes that the instructor is understating the number of hours needed to pass and surveys 36 students and finds the sample mean and standard deviation to be 5.7 and 1.5 hours respectively. Test the instructors claim at a .10 level.
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The heights of adult men in America are normally distributed, with a mean of 69.6 inches and a standard deviation of 2.66 inches. The heights of adult women in America are also normally distributed, but with a mean of 64.2 inches and a standard deviation of 2.56 inches. A. If a man is 6 feet 3 inches tall, what is his z-score (to two decimal places)? B. If a woman is 5 feet 11 inches tall, what is her z-score (to two decimal places)? C. Who is relatively taller?
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The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006). Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 46 male consumers was $132.31, and the average expenditure in a sample survey of 37 female consumers was $63.58. Based on past surveys, the standard deviation for male consumers is assumed to be $33, and the standard deviation for female consumers is assumed to be $20. The z value is 2.576. Round your answers to 2 decimal places. a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females? b. At 99% confidence, what is the margin of error? c. Develop a 99% confidence interval for the difference between the two population means. to
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What does a mean of 9.1429 and a standard deviation of 2.5455 tell you

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