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Refer to a study published in the Journal of the American Medical Association and reported in the Sacramento Bee on January 26, 2000 ("Study Ties Hormone Replacement, Cancer" by Shari Roan, p. A1). A sample of 46,355 postmenopausal women were studied for 15 years and asked about their use of hormone therapy and whether or not they had breast cancer; 2082 developed the disease.
The article reported that "for each year of combined [estrogen and progestin] therapy, a woman's risk of breast cancer was found to increase by 8 percent compared to a 1 percent increase in women taking estrogen alone."
Do you think this research was an observational study or a randomized experiment? Explain.
What would your experimental approach be to test this hypothesis - What are the independent and dependent variables?
future electronics makes cd players. its research department found that the life of the laser beam device is normally
Based on a sample of restaurants in a large city, the frequencies are found to be f1 = 5, f2 = 8, f3 = 20, f4 = 32, and f5 = 23. What is the sample size, n? Verify that the sample mean is X‾ = 3.7.
The following table represents a summary by state for Medicare enrollment (in thousands) for 15 randomly selected states in 1998 (source: Statistical Abstracts of the United States, 1999).
The amounts (in ounces) of juice in eight randomly selected juice bottles from a normally distributed population are given below. Construct a 95% confidence interval for the mean amount of juice in all such bottles. Round the confidence interval ..
Finding the probability of sample and describe the sampling distribution of the sample means.
Suppose a random sample of 20 tax returns from small business is examined. What is the binomial probability that at least one tax return involves fraud?
Does the regression equation account for a significant portion of the variance in the cognitive scores? Use a=.05 to evaluate the F-ratio.
Make the plot such that if the outlier were removed, the correlation for the remaining points would be between -0.2 and +0.2. Sketch an approximate facsimile of your resulting graph.
One of the response variables was a measure of attachment to friends (roughly, secure relationships), measured by the Inventory of Parent and Peer Attachment. The results are summarized in the table below.
bank of americas consumer spending survey collected data on annual credit card charges in seven different categories of
At the bottom of each model write the role that each variable plays in the model (i.e. dependent variable (DV), independent variable (IV), moderator, and mediator).
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