A medical researcher wishes to see whether the pulse rates of smokers are higher than the pulse rates ofnonsmokers. Samples of 100 smokers and 100 nonsmokers are selected. The results are shown below.SmokersNonsmokersX = 90S1 = 5nj = 100X2= 88%3DS2 = 6n2 = 100a) Find a 99% confidence interval for the true mean difference in smokers pulse rates and nonsmokerspulse rates.b) At a = 0.05, can we conclude that the pulse rates of smokers is higher than the pulse rates onnonsmokers?

There are two independent samples which are smokers and non smokers. We have to construct 99%…

Answered: A medical researcher wishes to see…

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 researcher is interested in testing whether, on average, College X graduates' earnings differ from those of College Y graduates who work in similar jobs and have similar characteristics. Using a matched pairs design that controls for all relevant characteristics, she finds that a 95% confidence interval for μCollegeX¯ μCollegeY is between -250 TL and 2500 TL . If the number of pairs chosen is 10, what can she conclude? A ) She can be 95% confident that there is a significant difference in the mean earnings between College X and College Y graduates. B ) She cannot be 99% confident that there is a significant difference in the mean earnings between College X and College Y graduates. C ) She can be 98% confident that there is a significant difference in the mean earnings between College X and College Y graduates. D ) She cannot be 80% confident that there is a significant difference in the mean earnings between College X and College Y graduates. E ) She cannot be 90% confident that…
A random sample of 300 of toy trains produced by a company are selected from a production line and 60 are found to be defective. Provide a 95% confidence interval estimate of the proportion of all toy trains produced by the company that will be defective. What is the value for the margin of error?
The samples were analysed to determine their chemical composition and the percentage of aluminum oxide in each of 9 and 10 samples at two sites shown in the table below. a. Construct 90% confidence interval for the variances of aluminum oxide in two sites: b. If the 90% confidence interval is given by [0.334, 2.640], what can you say about the variances of aluminum oxide in two sites.
A survey conducted by the AAA showed that a family of four spends on average $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252.45 per day with a sample standard deviation of $74.50. Develop a 98% confidence interval for the mean amount that a family of four visiting Niagara Falls will spend.
A genetic experiment with peas resulted in one sample of offspring that consisted of 406406 green peas and 158158 yellow peas. a. Construct a 9595% confidence interval to estimate of the percentage of yellow peas. b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not 25%, do the results contradict expectations?
A random sample is used to estimate the mean time required for caffeine from products such as coffee or soft drinks to leave the body after consumption. A 95% confidence interval based on this sample is: 5.6 hours to 6.4 hours (for adults). What is the margin of error?
A consumer watchdog group estimates the mean weight of 1-ounce fun size candy bars to see if customers are getting full value for their money. A random sample of 40 bars is selected and weighed, and the group reports that a 95% confidence interval for the true mean weight of the candy bars is 0.994 to 0.998 ounces. Are consumers getting their moneys worth if they buy these 1 ounce fun size candy bars?
The capacities in amp/hrs were measured for a sample of 120 batteries. The average was 178 and the standard deviation was 14 amp/hrs. Find a 95% confidence interval for the mean capacity of batteries produced by this method.
A recent survey showed that from a sample of 500 packages delivered by a Postal Service,480 were delivered on time.Construct a 95% confidence interval for the proportion of all packages that are delivered on time by the Postal Service. Show all workings and use the appropriate statistical table.
A survey conducted by the American Automobile Association (AAA) showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252.45 per day and a sample standard deviation of $74.50. a. Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals). $ to $
A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $256.45 per day and a sample standard deviation of $78.50. (a) Develop a 95% confidence interval estimate of the mean amount spent per day in dollars by a family of four visiting Niagara Falls. (Round your answers to the nearest cent.) $ to $ (b) Based on the confidence interval from part (a), does it appear that the population mean amount spent per day by families visiting Niagara Falls differs from the mean reported by the American Automobile Association? Explain. No. The overall average daily vacation expenditure of $215.60 per day is between the upper and lower limits of the confidence interval for the population mean at Niagara Falls. This suggests we cannot determine if the population mean at Niagara Falls is greater than the overall…
A sample of 1200 females and 1000 males found that 78.3% of females and 35.1% males supported increased funding of arts. Construct a 90% confidence interval around the difference in proportions.

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