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Imagine that you have a portfolio of stocks. You want to compare the performance of your stocks to the market as a whole. You learn that the population mean,μ, of stock returns is 7%, and that the population standard deviation, σ, is 2%.
i) Imagine that you have a portfolio of 10 stocks, that have a sample mean of 14%. Construct a 90% confidence interval.
ii) What is the probability that the sample mean is equal to the population mean?
A random sample of 72 graduate students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval above, is the population proportion of females equal to 0.60?
What size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 3 percent?
Suppose a survey item asks someone if something is very important, somewhat important, not very important, or unimportant. This is an example of what level of measurement?
question the associated press reports that the mean trading volume for equity and index options contracts was 3.6
A wildlife biologist wants to do a test to see if there is a genetic trait linked to industrial toxins. Previous research says the trait is usually found in one out of every thirty frogs.
Findout the margin of error for this survey if we want a 99 percent confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
Two rainstorms occurred in one week in a certain area. The first storm lasted 25 hours, and the second storm lasted 35 hours, for a total 2050ml of rain.
A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml.
The time interval between services at the station follow exponential distribution and as such the mean time taken to serve a unit is 5 minutes. What is the expected average queue length?
Find out the value of test statistic utilizing one sample proportion testing. Use the subsequent information for the below questions.
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