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1. A company has a new process for manufacturing artificial amethysts. In a trial run, 46 amethysts are produces. The mean weight for these 46 gems is = 6.75 carats, and the standard deviation is .33 carat. Let μ be the mean weight of the distribution of all amethysts produced by a new process. Find a 95% confidence interval (Do a full write-up)
2. Suppose a random set of forty communities gave an average of x-bar = 147.8 reported cases of larceny per year. Assume that population standard deviation is known to be 39.9 cases per year. Find a 98% confidence interval (Do a full write-up)
3. The home run percentage is the number of home runs per 100 times at bat. A random sample of 43 professional baseball players gave the following data for home run percentages.1.6 2.4 1.2 6.6 2.3 0.0 1.8 2.5 6.5 1.8 1.2 1.8
2.7 4.2 1.6 2.7 2.0 1.9 1.3 2.7 1.7 1.3 2.1 2.8
1.4 1.8 3.1 3.8 3.2 3.8 2.1 3.4 1.3 1.5 2.9 2.6
0.0 4.1 2.9 1.9 2.4 0.0 1.9 Compute a 90% confidence interval for the population mean μ of home run percentages for all professional baseball players.
What is the difference between probability sampling and simple random sampling? Simple random sampling is a type of probability sampling.
question a bacteria culture starts with 500 bacteria and grows at a rate proportional to its size. after 3 hours there
1) There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. a) Determine the standard error of the proportion.
problem 1if various samples of size 15 that is each sample consists of 15 items were taken from a large normal
in a gallup poll of 1003 randomly selected subjects 373 said that they have a gun in their home. the accompanying
three dice were rolled. what is the probability that exactly one six came up if it is known tha tat least one six came
Give your answer to the nearest integer.
assume that the mean score on a certain aptitude test across the nation is 100 and that the standard deviation is 20
Part 1: Define and explain historical research. Explain a situation in which historical research would be appropriate. Part 2: Explain the difference between external and internal evidence and give examples of each.
So construct a multiple regression model for predicting the crime rate based upon various explanatory variables unemployment rate, median income, education level.
What is the estimate of the proporation of employees who do not use the ATM in a month? Develop a 95 percent confidence interval for the mean number of transactions per month.
explain what problems arise in trying to make conclusions based on a survey mailed to the subscribers of a specialty
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