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A researcher investigates the relative risk of ovarian cancer between women who regularly use talcum powder and those who do not . She records the following data
Ovarian Cancer (columns); Talcum (Rows)
YES NO
Yes 40 460
NO 38 662
Based on this ample evidence, what is 95% confidence interval for the relative risk of developing ovarian cancer for women who use talcum powder vs. those who do not?
a) (0.07, 2.84) b) (0.23, 1.23) c) (-0.07, 0.84) d) (0.96, 2.26)
The May 1, 2007, College Retirement Equity Fund (CREF) prospectus lists the following sample returns on $1 invested in two of the fund's accounts, per year.
Determining the bias the instructor will provide you with the "correct" lengths for each string. Plot the correct values on the plots of the data made previously. What do you see?
consider the formula used for any confidence interval and the elements included in that formula. what happens to the
A telemarketing company wants to find out if people are more likely to answer the phone between 8pm and 9pm than between 7pm and 8pm.
Explain why it would not be appropriate to use this information to set up a confidence interval for population mean female Verbal SAT score in the year 2000.
Do male and female school superintendents earn the same pay? A sample of male and female school superintendents showed the following salaries in $'000.
A random sample of 51 observations was selected from a normally distributed population. The sample mean was x = 88.6 , and the sample variance was s2 = 38.2.
The English Department wants to know whether there is a difference in the proportions of female students taking Eng 110 and Eng 100 courses. Samples are collected from each class: Eng 110 sample found 16 out of 29 students in class and Eng 100 ..
1. Explain some of the advantages of using pwm methods in a program. 2. Give the rpm rating for the dc motor used in this lab. 3. What is the purpose of the opto-isolator in figure 5-2?
If we assume nothing about the shape of the distribution, approximately what percentage of all such tires will last between 25,000 and 37,500 miles?
Estimate the proportion of infants whose mothers experienced toxemia during pregnancy. Use 95% confidence level and doctors think that more than 20% of the infants their mothers experienced toxemia. Is that correct?
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days.If a gestation period is 276 days, what percentile among human births is this?
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