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A group of investigators wishes to explore the relationship between the use of hair dyes and the development of breast cancer in females. A group of 1000 beauticians 40-49 years of age is identified and followed for five years. After five years, 20 new cases of breast cancer have occurred. Assume that breast cancer incidence over this time period for average American women in this age group is 7/1000. We wish to test the hypothesis that using hair dyes increases the risk of breast cancer. Is a one- or two-sided test appropriate here? Compute the p value for your choice.
how does the t-value for the sample correlation coefficient r compare to the t-value for the corresponding slope b of
A building developer has the opportunity to purchase several acres of land that is divided up into several lots for building single-family homes.
Suppose a fast food restaurant wishes to estimate average sales volume for a new menu item. The restaurant has analyzed the sales of the items at a similar outlet and observed the following results:
Patient does not have disease occurs 1% of the time. If a randomly selected individual is positive what is the probability that the individual has the disease?
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviation is $100?
a box of 10 gloves contains three left-handed gloves and seven right-handed gloves. complete parts a through d.a. if
if the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120 the 95
The company uses two cost driver rates for allocating manufacturing overhead costs to job orders: one on the basis of machine hours for allocating machining department overhead costs and the other on the basis of direct labor cost for allocating t..
Boston Globe article "bargains on the menu-and a Side of Jitters" reported concerns
is wheaties a power breakfast? a study is done an an elementary statistics class 500 students agree to participate.
In addition, the gender of the respondent is noted. After analyzing the results the following table of joint probabilities was produced: Find the probability that a customer who rates Windsor as excellent is a man. 0.45
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