A random sample of 35 individuals in the waiting line for service by a bankofficer is selected.From the sample, we found that the mean waiting time was 22 minutes with astandard deviation of 8 minutes. The bank officer wants to estimate themean waiting time.i) Define the population parameter of interest in this problem.ii) Calculate the margin of error for a 90% confidence interval.iii) Using a 90% confidence level, estimate the population mean waiting timefor all individuals waiting in the service line.Ans:iii) (19.78, 24.22 minutes)

Given that A random sample of 35 individuals in the waiting line for service by a bank officer is…

Answered: A random sample of 35 individuals in…

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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Assume that population means are to be estimated from the samples described. Use the sample results to approximate the margin of error and 95% confidence interval. Sample size=64, sample mean=69, sample standard deviation=7 what is the margin of error
We wish to estimate an average number of education years for a college student atWVC. We take a sample of 47 students and find that the mean is 5.3 years and standard deviation is 0.9years.Find the 95% confidence interval for the population mean.
Paint used to paint lines on roads must reflect enough light to be clearly visible at night. Researchers have 2 new types of paints they want to test paint type A and paint type B. For each paint type, they tested if there was statistical evidence the average reflectometer reading is greater than 35. To test each type of paint, they used 15 paint samples. Further, suppose the standard deviation is the same for both types of paints. The sample mean for paint type A was 39 and the sample mean for paint type B was 41.5. For both statistical tests, the significance level is set to .05.Which of the following is true? If they fail to reject the null hypothesis for paint type A we can conclude there is statistical evidence the average reflectometer for type A paint is 35. The p-value for the type B paint test is smaller. They rejected the null hypothesis for both paint types. Exactly two of the statements above are true. None are true.
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(c) Find the probability that exactly one of the cases is According to CDC estimates, more than 2.8 million people resistant to any antibiotic. Give your answer to four decimal places. in the United States are sickened each year with antibiotic-resistant infections, with at least 35,000 dying as a result. Antibiotic resistance occurs when disease-causing microbes become resistant to antibiotic drug therapy. Because this resistance is typically genetic and transferred P(X = 1) = to the next generations of microbes, it is a very serious public health problem. Of the infections considered most serious by the CDC, gonorrhea has an estimated 1.14 million new cases occurring annually, and What is the probability that at least one case is resistant to approximately 50% of those cases are resistant to any any antibiotic? (Hint: It is easier to first find the probability antibiotic. Assume a health clinic in California sees 5 that exactly zero of the 5 cases were resistant.) Give your patients…
What is the minimum required sample size to make a 96% confidence interval for a population mean if the margin of error is to be 2 inches and the standard deviation is thought to be about 12 inches?
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Suppose that a garage samples 21 customers. They find the average time for there oil change is 4,305 miles. Find a 90% confidence interval of the true mean, if the population standard deviation is 1,151.
It seems these days that college graduates who are employed FT work more than 40-hour weeks. Data are available that can help us decide if this is true. A survey was recently sent to a group of adults selected at random. There were 15 respondents who were college graduates employed FT. The mean number of hours worked per week by these 15 respondents was 44 hours, with a standard deviation of 8 hours. Assume that the population of hours worked per week by college graduates employed FT normally distributed with mean u. Can we conclude that u is greater than 40 hours? Use the 0.1 level of significance. Perform a one-tailed test. Carry intermediate computations to 3 or more decimal places and round answers as specified.
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