A soft drink machine is regulated so that the amount of drink dispensed is distributed with a standard deviation of 5mLs. Find the sample size necessary to be 95% confident that our sample mean will be within 3mLs of the true mean.

Q: In one region of the Caribbean Sea, daily water temperatures are normally distributed with a mean of…

A: It is given that the mean is 77.9 and standard deviation is 2.4.

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of 400…

A: Given data Mean = 400 Standard deviation = 100 To find the top 3%, we need to find the z-value…

Q: A computer manufacturer claimed that the mean weight of their laptops is 5.5 pounds. A sample of 125…

A: Given Information: Population mean (u) = 5.5 pounds Standard Deviation (s) = 1.1 pounds Sample mean…

Q: To compare the braking distances for two types of tires, a safety engineer conducts 35 braking tests…

A:

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: Solution: Let X be the number of daily requests. From the given information, X follows normal…

Q: When Nachelle runs the 40o meter dash, her finishing times are normally distributed with a mean of…

A: The empirical rule for normal distribution states that 95% of data lies within 2 standard deviations…

Q: An insurance company wants to know if the average speed at which men drive cars is greater than that…

A:

Q: The weights of college football players are normally distributed with a mean of 200 pounds and…

A:

Q: According to a sports report, the time of finishers covering a certain distance is normally…

A: Solution: Let X be the time of finishers covering a certain distance. From the given information, X…

Q: it is claimed that personal vehicle is driven 24500 km per year. would you agree with this claim if…

A:

Q: In an all boys school, the heights of the student body are normally distributed with a mean of 69…

A: By empirical rule, Approximately 68% of the data values lie within 1 standard deviation on each…

Q: At a local restaurant, the amount of time that customers have to wait for their food is normally…

A: We have given that,  X be the random variable from normal distribution with mean = 28 and standard…

Q: The average standard deviation of the waiting time for a single queue is 4.7 minutes. The average…

A: The hypotheses for the test are given below: Null hypothesis: H0: σ=4.67. Alternative hypothesis:…

Q: it is claimed that personal vehicle is driven 24500 km per year. would you agree with this claim if…

A:

Q: The average American consumes 98 liters of alcohol per year. Does the average college student…

A:

Q: A food company is concerned that its 16-ounce can of sliced pears is not being filled correctly. The…

A: State the hypotheses That is, the mean weight is equal to 16 ounces. That is, the mean weight is…

Q: A quality control company was hired to study the length of meter sticks produced by a certain…

A: The mean length would be at the 92nd percentile is obtained below: here, P (Z < z) = 92% P (Z…

Q: If the manager of a bottled water distributor wants to​ estimate, with 90​% confidence, the mean…

A: According to the provided information,

Q: A hospital administrator believes that the standard deviation of the number of people using…

A:

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence , the mean…

A:

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A:

Q: A small computing centre has found that the number of jobs submitted per day to its computers has a…

A:

Q: If the manager of a bottled water distributor wants to​ estimate, with 99​% ​confidence, the mean…

A:

Q: If the population standard deviation is 10, how large a sample is necessary to have a standard error…

A: The population standard deviation is 10 and the standard error is less than 5 points.

Q: The average weekly earnings of bus drivers in a city are $950 with a standard deviation of $45.…

A: The formula for calculating the standard error of the sample is,

Q: The physical plant at the main campus of a large state university receives daily requests to replace…

A: Given, The distribution of the number of daily requests is bell shaped with mean of 52 and standard…

Q: A soft drink vending machine is adjusted so that on average, it will automatically dispense 200 mL…

A: Given,sample size(n)=35sample mean(x¯)=195population standard deviation(σ)=14α=0.05

Q: If the manager of a bottled water distributor wants to​ estimate, with 90% ​confidence, the mean…

A: Determine the sample size n needed. Here, confidence level is 0.90.   Use EXCEL Procedure for…

Q: The quality-control manager at a light bulb factory needs to determine whether the mean life of a…

A:

Q: A dean at BUC claims that the average age of the students in this college is 25. A random sample of…

A: Note: Thank you for the question. Since it is not mentioned the standard deviation is population…

Q: The number of pizzas consumed per month by university students is normally distributed with a mean…

A: Let X be the number of pizzas consumed per month follows normal distribution with mean 10 and…

Q: A travel analyst claims that the mean room rates at a three-star hotel in Chicago is greater than…

A: Given dataSample size = 36Sample mean = 163Hypothesized mean = 152Population standard deviation =…

Q: At a local restaurant, the amount of time that customers have to wait for their food is normally…

A:

Q: An insurance company wants to know if the average speed at which men drive cars is greater than that…

A:

Q: A used car dealer says that the mean price of a three-year-old sports utility vehicle (in good…

A: Solution: Given information: n= 22 Sample size  x= $20640  Sample mean μ= $20000  Population mean…

Q: A manufacturer claims that a particular automobile model will get 50 miles per gallon on the…

A: μ=50 miles per gallon n = 30 cars x¯=2.3 miles per gallon σ=49 miles per gallon Let the level of…

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A: Parametric test are used to study the population when the size is larger by taking sample. If the…

Q: The manager at a local grocery store thinks customers might benefit from a self-checkout aisle…

A: Solution: We are given that the manager decides to analyze the standard deviation of the wait times…

Q: If the standard deviation of scores on the MCAT exam is 11.0, how large a sample is needed to…

A: The random variable score follows normal distribution. We have to find the sample size.

Q: A published study says that 95 percent of American children are vaccinated against measles, with a…

A: A t-test is used to determine the test if there is any significance difference between two mean…

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: let X be the distance of fly balls hit to the outfield X~N(mu=260,sigma^2=50^2) n=49 we want to find…

Q: Kurtis is a statistician who claims that the population mean annual salary of an employee in…

A: Test hypothesis:Denote the population mean annual salary of an employee in the city of Yarmouth as…

Q: The number of cell phone minutes used by staff of DIT at Bowie State University follows a normal…

A: We have, X= The number of cell phone minutes used by staff of DIT at Bowie State university. Mean=…

Q: The braking distance for a Krazy-Car traveling at 50 mph is normally distributed with a mean of 50…

A: *answer:

Q: It is claimed that personal vehicle is driven 24500 km per year. Would you agree with this claim if…

A: Given data: Population mean = 24500 Sample size = 100 Sample mean = 28000 Sample standard deviation…

Q: A consumer protection group suspects that a particular 285-gram packages of tofu actually weighs…

A:

Q: Although the experimenter does not know it, the population mean for the treatment condition is 10,…

A: Type II error: Type II error is the failing to reject the null hypothesis when it is false.…

Q: A travel analyst claims that the mean price of a round trip flight from New York City to Los Angeles…

A: Solution: