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There're two machines available for cutting corks intended for employ in wine bottles. The first produces corks with diameters that are normally distributed with mean 3 cm and standard deviation .1
Determine the 90% confidence interval estimate of mean life expectancy for all batteries produced at this plant. What would the 90% confidence interval estimate be if the sample mean had come from a s
A bottling machine is operating with standard deviation of 0.12 ounces. Assume that in a random sample of 46 bottles from the Houston bottling plant, the machine fill was an average of 16.1 ounces,
A state inspector thinks that more than 35% of cars on state roads fail to meet pollution control requirements. Which of the following statements is appropriate in investigating this belief
A large greenhouse has developed new plant. They're interested in how the plant grows under different conditions. Your task is to design an experiment to test the plant growth taking into considerat
Explain the general roles of the three requirements of experimental design with particular reference to your design in (a).
A manufacturing plant employs light bulbs whose life spans are normally distributed, with mean and standard deviation equal to 500 and 60 hours, respectively. In order to minimize the number of bulb
A music school has budgeted to purchase three musical instruments. They plan to purchase a piano costing $3,000, a guitar costing $550, and a drum set costing $600.
A girl has 50 disks she but she only desire to take 4 on a trip. How many choices of 4 discs does she have? Once she's selected the 4, in how many orders can she play them while on the trip?
A company selling vegetable seeds in packets of 20 estimate that the mean number of seeds that will actually grow is 18,with standard deviation of 1.2 seeds. you buy 5 differentseed packets.
According to the CDC (Centers for Disease Control and Prevention), men who smoke are 23 times more likely to develop lung cancer than men who don't smoke. Also according to the CDC, 21.6% of men in
Students enrolled in an introductory statistics course at university were asked to take survey that indicated whether the student's learning style was more visual or verbal.
The mean of such ten rent prices is $618.3, and standard deviation is $85.3. Find out the standard error of the sample mean. Explain what the population mean µ means in this context.
Conduct the hypothesis test and provide the test statistic, critical value and P-value, and state the conclusion.
On a game show there're two contestants. A contestant answers series of questions till they make mistake and then it becomes the other contestants turn.
A study published in JAMA in 2004 determined past results of other studies on bariatric surgery. Bariatric surgery is done to reduce the size of the stomach in various ways. It is typically used onl
In 2008 General Social Survey, people were asked whether they thought the sun went around the earth or vice versa. Of 1381 people, 310 thought the sun went around the earth.
In simple random sample of 1200 Americans age 20 and over, the proportion with diabetes was found to be 0.115(or 11.5%).
In sample with a mean of 46 and a standard deviation of 8, what is the probability of randomly selecting each of the following raw scores?
In 12,000 independent tosses of a die, it landed on "1" 2,500 times. Is it reasonable to assume that the die is not fair?
In an article in Accounting and Business Researchers studied auditor lobbying on several proposed US accounting standards that affect banks and savings and loan associations.
Assume data is gathered where x = diameter of tree trunk in inches, and y = tree height in feet. If the LSR line equation is y = -3.6 + 3.1x, use the equation to predict the height of a tree with t
A scatterplot shows a pattern of points that is going "downhill" as you read left to right. The trend is fairly straight, but it is not a perfect straight line. Which of the following correlations i
Some biologists notice a relationship between outdoor temperature and the number of times a cricket chirps each minute. Data are obtained for various temperatures and crickets.
Can you explain a chi-square distribution and it's 4 components? Determine the Goodness of Fit test? Explain the steps employed to do the Goodness of Fit test. When the Goodness of Fit test could be