0 123ess is functioning properly.significance.5workers from one companyBut a general perception is1 of significancemnle6.32Jeffery,a high school swimmer, swims the 25-yard freestyle with a mean time of 16.43 secondswithout using goggles. After his father bought him goggles, Jeffery swam the 25-yard freestyle 15times. After the 15 swims, Jeffery's mean time was 16 seconds and sample standard deviation was 2seconds. His father thought the goggles helped Jeffery swim faster. Test his father's hypothesis usinga 5% level of significance. Assume that the sample of measurements are from a normally distributedpopulation.6.30suburb.

Given that , the sample mean is 16 and sample standard deviation is 2 and the sample size is 15, The…

Answered: that suburb. 6.32 Jeffery, a high…

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 company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 99.3-cm and a standard deviation of 1.5-cm. For shipment, 25 steel rods are bundled together.Find P27, which is the average length separating the smallest 27% bundles from the largest 73% bundles. P27 =
JA researcher takes an SRS of 80 people who go golfing.The average to be u52 years old. It was also determined that the standard deviation of cac ot golfers was la What is the probability that the sample mean is kss. than 47 years old? age of all golferswas determined years.
Find the number of women.
The average amount of money that each customer spends at a particular bar is $27.84 with a standard deviation of $7.32. The owner of the bar is attempting to increase sales. The owner decides that playing live music will increase sales. The owner tests her theory by getting her son’s garage band to play one night at the bar for a random sample of 64 of her customers and then records the check total for each customer who was there while the band was playing. The customers who were there while the band was playing spent an average of $24.56. Conduct a one-tailed hypothesis test with a significance level of 5% to determine if customers spent more money when the live music was playing.
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 231.1-cm and a standard deviation of 2-cm. Answer the following to the nearest tenth of a cm. Find P10, which is the length separating the shortest 19% rods from the longest 81%. P19 -cm
A local convenience store in a large city closes each day at 10 P.M. The owner of the store is investigating whether mean sales will increase by at least $10 per day if the store remains open until 11 P.M. The owner asked the 41 members of a local civic group to estimate the amount of money they might spend during the extra hour. The sample mean was $11.50. The owner will conduct a one-sample tt-test for a population mean. Have the conditions for inference been met? A)nYes, all conditions have been met. B) No, the sample was not chosen using a random method. C) No, the sample size is greater than 10 percent of the population. D) No, the sample size is not large enough to assume normality of the sampling distribution. E) No, the distribution of the sample is not normal.
At 60 airports within a region, the temperature is recorded. The average temperature is 67°F, with a 5°F standard deviation. What is the z-score for 68°F?
A local convenience store in a large city closes each day at 10 P.M. The owner of the store is investigating whether mean sales will increase by at least $10 per day if the store remains open until 11 P.M. The owner asked the 41 members of a local civic group to estimate the amount of money they might spend during the extra hour. The sample mean was $11.50. The owner will conduct a one-sample tt-test for a population mean. Have the conditions for inference been met? Yes, all conditions have been met. A No, the sample was not chosen using a random method. B No, the sample size is greater than 10 percent of the population. C No, the sample size is not large enough to assume normality of the sampling distribution. D No, the distribution of the sample is not normal. E
For team A, the average number of goals scored per match was 2 with standard deviation (SD) of 1.09 goals. For team B, the average number of goals scored per match was 2.5 with standard deviation (SD) of 1.25 goals. Find which team may be considered more consistent?
Last year, the average amount that teams for the Statistics Games raised was $375. Have teams been more successful at fundraising this year? To find out, you take a random sample of 36 teams. Your sample of 36 teams yields a mean of $396 and a standard deviation of $70. Might you have made a Type 1 or Type 2 error? A Type 1. This means that we said that the mean amount raised had increased, when it was actually still $375. B You might have made a calculation error. C Neither- we're sure the average has increased. D Type 2. This would mean that we said there was not enough evidence to say the mean had increased from $375, when it actually is higher than $375. E Either kind is possible!
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 119.5-cm and a standard deviation of 2.2-cm. For shipment, 24 steel rods are bundled together.Find P75, which is the average length separating the smallest 75% bundles from the largest 25% bundles.P75 = -cm

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