The USA Today reports that the average expenditure on Valentine's Day is $100.89. Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 41 maleconsumers was $135.67. and the average expenditure in a sample survey of 40 female consumers was $68.64. Based on past surveys, the standard deviation for male consumers is assumed to be $37, andExercise 10.27 Algorithmic: Not Answeredtne tmuuru uCnutionnvnmnurC coNsumers IS assumed to be $21.a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females (to 2 decimals)?b. At 99% confidence, what is the margin of error (to 2 decimals)?c. Develop a 99% confidence interval for the difference between the two population means (to 2 decimals). Use z-table.

Answered: The USA Today reports that the average…

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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In a recently conducted study, families reported using an average of 70 gallons of gasoline per month with a standard deviation of 8 gallons. If a family is chosen at random, what is the probability that it uses between 61 and 79 gallons of gasoline per month? Assume the data is normally distributed.
Researchers asked two groups of people to construct a jigsaw puzzle. One group of 55 people, who listened to soft classical music while working, had a mean construction time of 45 minutes. Another group of 45 people, who worked in silence, had a mean construction time of 55 minutes. Assume the population standard deviations for the construction times for people listening to classical music and people working in silence are 9.5 minutes and 11 minutes, respectively. Find the upper bound of the 99% confidence interval for the difference in population construction times between people listening to classical music as they work and people working in silence. Let the people listening to classical music be the first sample, and let the people working in silence be the second sample. Assume the samples are random and independent. Assume that both the population distributions are normally distributed. Round your answer to two decimal places. 90% confidence=1.645 95% confidence=1.96…
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