Homework Answers
Therefore the average amount
of energy used in the factory is 2000 megawatt per day and it is
not differ from 2005 energy.
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30. An engineer wants to know if the average amount of energy used in his factory...
An engineer wants to know if the average amount of energy used in his factory per...
An engineer wants to know if the average amount of energy used in his factory per day has changed since 2015. The factory used an average of 2000 megawatt hours (mwh) per day in 2015. Since 2015, the engineer surveyed 300 days and found the average energy use was 2040 mwh per day with a sample standard deviation of 400 mwh per day. (round your answers to four decimal places) part a: Specify the null and alternative hypotheses to determine...
A freelancer, who specializes in digital marketing, is interested in the average amount of money small...
A freelancer, who specializes in digital marketing, is interested in the average amount of money small businesses spend on pay per click advertising. In previous years, less than 3300 dollars, on average, is spent on pay per click annually. The digital marketing freelancer suspects this average has increased in recent years. If the digital marketing freelancer chooses to use a critical value approach for their hypothesis test, what do they need to calculate in order to compare with the critical...
Help Save & Edt Subr It is advertised that the average braking distance for a small...
Help Save & Edt Subr It is advertised that the average braking distance for a small car traveling at 65 miles per hour equals 120 feet. A transportation researcher wants to determine if the statement made in the advertisement is folse, meaning it is different than advertised. She randomly test drives 36 small cars at 65 miles per hour and records the braking distance. The sample average braking distance is computed as 114 feet. Assume that the population standard deviation...
2. Suppose the mean length of a YouTube video is 7.45 minutes. Marcella wants to know...
2. Suppose the mean length of a YouTube video is 7.45 minutes. Marcella wants to know if YouTube videos are becoming shorter on average. She randomly chooses 30 YouTube videos made in the last month, and computes their mean length as 6.87 minutes and their standard deviation as 2.4 minutes. Can Marcella conclude that YouTube videos have become shorter in the last month? Use a significance level of 0.05. Note that since Marcella has a sample size of geq30, she...
A professional baseball player changed his throwing motion to increase the velocity of his fastball. Before the change, the player threw his fastball at an average of 91 miles per hour. After the change in his throwing motion, the team watched him throw 6
A professional baseball player changed his throwing motion to increase the velocity of his fastball. Before the change, the player threw his fastball at an average of 91 miles per hour. After the change in his throwing motion, the team watched him throw 64 fastballs with an average speed of 91.75 miles per hour and a standard deviation of 3 miles per hour.a. Specify the null and alternative hypotheses to determine whether the baseball player increased the speed of his...
According to the financial reports by Snapchat, the average daily user of Snapchat created 19 messages,...
According to the financial reports by Snapchat, the average daily user of Snapchat created 19 messages, or "snaps," per day creates a random sample using information from students on her campus for the current semester, with the accompanying re Click the icon to view the daily snaps data. a. Using a = 0.05, test the hypothesis that the number of Snapchats sent by the average Snapchat user has not changed sin Determine the null and alternative hypotheses. HOH H:H (Type...
The average number of hours that Canadians spend on the internet at home has been 100...
The average number of hours that Canadians spend on the internet at home has been 100 hours per month for several years. In early March of 2020, as more people were starting to work and study at home, a random sample of 25 households found a mean of 104 hours with a sample standard deviation of 10 hours. The population standard deviation is unknown. Assume that hours spent on the internet are approximately normally distributed. Is there enough evidence to...
Billy wants to test whether the average speed of his favorite pitcher’s fastball differs from the league average of 92 miles per hour. He takes a sample of 36 of the pitcher’s fastballs and computes a sample mean of 94 miles per hour. Assume that the stan
Billy wants to test whether the average speed of his favorite pitcher’s fastball differs from the league average of 92 miles per hour. He takes a sample of 36 of the pitcher’s fastballs and computes a sample mean of 94 miles per hour. Assume that the standard deviation of the population is 4 miles per hour.a. Specify the null and alternative hypotheses to test Billy’s claim.b. Calculate the value of the test statistic and the p-value.c. At the 5% significance level,...
A civil engineer has been studying the frequency of vehicle accidents on a certain stretch of interstate highway. Longterm history indicates that there has been an average of 1.70 accidents per day on...
A civil engineer has been studying the frequency of vehicle accidents on a certain stretch of interstate highway. Longterm history indicates that there has been an average of 1.70 accidents per day on this section of the interstate. Let r be a random variable that represents number of accidents per day. Let O represent the number of observed accidents per day based on local highway patrol reports. A random sample of 90 days gave the following information. r 0 1...
A philanthropic organization helped a town in Africa dig several wells to gain access to clean water. Before the wells were in place, an average of 120 infants contracted typhoid each month. After the wells were installed, the philanthropic organization s
A philanthropic organization helped a town in Africa dig several wells to gain access to clean water. Before the wells were in place, an average of 120 infants contracted typhoid each month. After the wells were installed, the philanthropic organization surveyed for nine months and found an average of 90 infants contracted typhoid per month. Assume that the population standard deviation is 40 and the number of infants that contract typhoid is normally distributed.a. Specify the null and alternative hypotheses...
Help Save & Edt Subr It is advertised that the average braking distance for a small car traveling at 65 miles per hour equals 120 feet. A transportation researcher wants to determine if the statement made in the advertisement is folse, meaning it is different than advertised. She randomly test drives 36 small cars at 65 miles per hour and records the braking distance. The sample average braking distance is computed as 114 feet. Assume that the population standard deviation...
2. Suppose the mean length of a YouTube video is 7.45 minutes. Marcella wants to know if YouTube videos are becoming shorter on average. She randomly chooses 30 YouTube videos made in the last month, and computes their mean length as 6.87 minutes and their standard deviation as 2.4 minutes. Can Marcella conclude that YouTube videos have become shorter in the last month? Use a significance level of 0.05. Note that since Marcella has a sample size of geq30, she...
According to the financial reports by Snapchat, the average daily user of Snapchat created 19 messages, or "snaps," per day creates a random sample using information from students on her campus for the current semester, with the accompanying re Click the icon to view the daily snaps data. a. Using a = 0.05, test the hypothesis that the number of Snapchats sent by the average Snapchat user has not changed sin Determine the null and alternative hypotheses. HOH H:H (Type...
The average number of hours that Canadians spend on the internet at home has been 100 hours per month for several years. In early March of 2020, as more people were starting to work and study at home, a random sample of 25 households found a mean of 104 hours with a sample standard deviation of 10 hours. The population standard deviation is unknown. Assume that hours spent on the internet are approximately normally distributed. Is there enough evidence to...
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