Samples of two different models of cars were selected, and the actual speed for each car was determined when the speedometer registered 50 mph. The resulting 95% confidence intervalsfor true mean actual speed were (51.2, 52.6) and (49.2, 50.4). Assuming that the two sample standard deviations are equal, which confidence interval is based on the larger sample size?O (51.2, 52.6)O (49.2, 50.4)Explain your reasoning.O As the sample size increases, the width of the interval increases.O As the sample size increases, the width of the interval decreases.

Answered: Image /qna-images/answer/b894cf19-6609-4f13-8c18-9b1e57e7454e.jpg

Answered: Samples of two different models of cars…

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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a hamburger chain sells hamburger. A random sample of 25 hamburger is taken and each is weighed. the mean of this sample is 0.26 pound and the standard deviation of 0.03 pound. Suppose you you were asked to find the 95% confidence interval. what MARGIN of error should you use? Use the multiplier t*= 2.064 to calculate and round your answer to the three decimal places A. 0.061 B. 0.006 C. 0.107 D. 0.012
Solve the problem. Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent a 90% confidence interval for the average highway mileage of all SmartCars? O 47 ± 1.345- O 47 + 1.761- V15 O 47 + 1.645- 15 O 47 + 1.753-5 47 ± Next
Let n1=100, X1=60, n2=100, and X2=80. a. Determine the zstat, based on the difference p1−p2, and the p-value. b.Determine a conclusion c. Construct a 95% confidence interval estimate of the difference between the two population proportions.
A fitness center is interested in finding a 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 225 members were looked at and their mean number of visits per week was 2.1 and the standard deviation was 1.9. Round answers to 3 decimal places where possible. a. With 90% confidence the population mean number of visits per week is between and visits. b. If many groups of 225 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per week and about percent will not contain the true population mean number of visits per week.
According to the College Board, scores on the math section of the SAT Reasoning college entrance test for the class of 2010 had a mean of 516 and a standard deviation of 116. Assume that they are roughly normal.One of the quartiles of the scores from the math section of the SAT Reasoning test is 438. The other quartile is _______.
Assume that the heights of adult males (in inches) in the Sultanate of Oman are normally distributed on average. The mean length of a random sample of 25 adult Omani males is 69.72 inches, and the standard deviation is 4.15. My 90% confidence interval is:
1. The heights ( in inches) of the students on a campus are assumed to have a normal distribution with a standard deviation of 4 inches. A random sample of 49 students was taken with M=68 inches. The 95% confidence interval for the population mean is:
A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 97 students who averaged 25.5 texts per day. The standard deviation was 20.5 texts. Round answers to 3 decimal places where possible. b. With 90% confidence the population mean number of texts per day is between ______ and _______ texts. c. If many groups of 97 randomly selected members are studied, then a different confidence interval would be produced from each group. About _______ percent of these confidence intervals will contain the true population number of texts per day and about ___________ percent will not contain the true population mean number of texts per day.
A set of exam scores is normally distributed with a mean = 82 and standard deviation = 6.Use the Empirical Rule to complete the following sentences.68% of the scores are between and .95% of the scores are between and .99.7% of the scores are between and .
A sample of 39 task has been considered and was analyzed. It was found out that the values 21 and 2.7 are obtained for the sample mean and the population standard deviation, respectively. Construct a 80% confidence interval for the population mean. Solve the following questions and express your final answer in 2 decimal places whenever possible. a. upper confidence interval of the population mean b. lower confidence interval of the population mean
A set of exam scores is normally distributed with a mean = 76 and standard deviation = 10.Use the Empirical Rule to complete the following sentences.68% of the scores are between and .95% of the scores are between and .99.7% of the scores are between and .

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