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Suppose that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed.
a) What type of sampling should you do? Why?
b) Explain how you would carry out the sampling according to the method in (a)
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
Test whether the gender distribution for basketball fans is significant different from general college by proportion test.
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
A standard deviation of $20, obtain the probability that a monthly landline phone bill for a household is less than $100.
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5 percentage points with 92% confidence?
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
Give an example of a problem (business, political, scientific) in which ANOVA analysis would be appropriate. (Hint: the dependent variable is categorical, such as male vs. female or comparing three different types of fertilizer.)
Find/discover an example of statistics in the news to discuss the following statement that represents one of the objectives of statistics analysis: "Statistics helps us make decisions based on data analysis.
Recognize and explain potential threats (up to 3) to external validity.
You may assume the sample data comes from a population that follows a normal distribution. Using a .05 level of significance test the company's claim.
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