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MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Construct a 99%cofidence interval for a population mean if we have a sample mean of 67.5 a sample standard deviation of 8.3 and n=7
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- Assume the average amount of caffeine consumed daily by adults is normally distributed with a mean of 260 mg and a standard deviation of 48 mg. In a random sample of 600 adults, how many consume at least 320 mg of caffeine daily?arrow_forwardCalculate the observed z value using a sample mean of 25, a population average of 20, and a standard error of the mean of 8.arrow_forwardSuppose the body mass index (BMI) of a group of athletes has a population mean of 24.98 and a standard deviation of 4.18. If a random sample of 150 athletes is chosen for a study, compute the standard deviation of the sampling distribution of the mean. Give your answer to two decimal places.arrow_forward
- What is the observed value for the 98th percentile of a population with a mean of 2.5 and a standard deviation of 0.1 if the standardized score is 2.05? 2.05 0.02 2.705 2.295arrow_forwardThe sample standard deviation is a measure of what?arrow_forwardA random sample of 120 cars in the drive-thru of a popular fast food restaurant revealed that the mean bill of $29.27 per car. The population standard deviation is $6.17. Find the mean bill for all cars from the drive-thru with 82% confidence.arrow_forward
- Suppose that blood chlorine concentration (mmol/L) has a normal distribution with mean=98 and standard deviation=7. For a sample of n=40, what is the corresponding mean and standard deviation of the sampling distribution?arrow_forwardThe average score on the verbal portion of the college entrance exam is 453, with a standard deviation of 95. A random sample of 137 seniors at Claremore high school shows a mean score of 502. IS there a significant difference?arrow_forwardA population has a mean μ=139 and a standard deviation σ=24. Find the mean and standard deviation of the sampling distribution of sample means with sample size n=48.arrow_forward
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