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1. When we say we have a confidence level of 95%, what do you think our "margin of error" is?
2. If we move the level of confidence from 95 to 99%, what will happen to our margin of error? What will happen to the width of our confidence interval?
3. Would we have gotten a better feel for the amount of flour needed if we'd used a larger sample? Why (mathematically) would this happen?
What is the point estimate of the mean planned expenditure by all Americans taking long summer vacations in 2002?
Can you describe in detail the differences in ANOVA and the five-step hypothesis testing method?
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
Conclude whether the given conditions justify using the methods of this section when testing a claim about a population mean µ.
Find the sample proportions and test statistic for equal proportions. Is the decision close? Find the p-value.
A salesperson goes door-to-door in a residential area to demonstrate the use of a new household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) i..
Mean and standard deviation for new sample were then computed to be M _ 6 and s _ 3. Write down the values of mean and standard deviation for original sample?
Marks on statistics midterm test are normally distributed with mean of 78 and a standard deviation of 6. Determine the probability that class of 50 has average midterm mark that is less than 75?
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
To what probabilities do each of the following sigma levels correspond to, based on a standard normal curve: 3 sigma, 4sigma, 5 sigma, and 6 sigma? (Hint: Use the NORMSDIST function in Excel.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
In which of the following markets do all firms sell the same standardized product?
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