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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.
A cohort study was designed to look at the association of pesticides and the occurrence of childhood leukemia. Children living in rural areas were followed and leukemia rates were compared between those children living in areas with high and low p..
Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours.
a bank wishes to estimate the mean credit card balance owed by its customers. the population standard deviation is
Calculate all measures of central tendency and depict what happens before and after the addition of the two transfer students.
in a random sample of four microwave ovens the mean repair cost was 70.00 and the standard deviation was 11.00. assume
the random variable x is the crew size of a randomly selected shuttle mission. its probability distribution is shown
Which player has scored more on an average? Which player is more consistent in his performance. Claculate mean deviation from the median for the following data.
a new integrated computer system is to be installed worldwide for a major corporation. bids on this project are being
Level of education attained by the women from a rural region is divided into three categories: can read/write degree; primary degree; secondary and above degree
Demand for a popular athletic shoe is nearly constant at 800 pairs per week for a regional division of a national retailer. The cost per pair is $54.
the probability that a call-centre consultant receives 3 calls during any given hour is 0.1404 and the probability
Christianity teaches that God exists in three persons:
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