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100 people are given a standard antibiotic to treat an infection and another 100 are given a new antibiotic. In the ?rst group, 90 people recover; in the second group, 85 people recover. Let p1 be the probability of recovery under the standard treatment and let p2 be the probability of recovery under the new treatment. We are interested in estimating θ = p1 - p2. Provide an estimate, standard error, an 80 percent con?dence interval, and a 95 percent con?dence interval for θ.
1.a study was conducted to explore the relation between alcohol consumption and hypertension. 7400 nurses were surveyed
an insurance company found that 2.5of male drivers between theages of 18 and25 are involved in serious accidents
A random sample of 1440 current job applicants results in 61 failures (based loosely on data from the American Management Association).
urn a has 12 white and 16 red balls. urn b has 3 white and 8 red balls. we flip a fair coin. if the oucome is heads
A study seeks to compare hospitals based on the performance of their intensive care units. The dependent variable is the mortality ratio, the ratio of the number of deaths over the predicted number of deaths based on the condition of the patients.
Ten prominent citizens have been nominated for a community's "Citizen of the Year" award. First- and second-place trophies are awarded to the two persons receiving the highest and second-highest number of votes.
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools.
twenty-nine percent of americans say they are confident that passenger trips to the moon will occur in their lifetime.
Calculate the measures of central tendency, dispersion, skew for your data. Display your descriptive statistical data using graphic and tabular techniques. Frequency distribution, Histogram.
a marketing survey involves product recognition in new york and california. of 558 new yorkers surveyed 193 knew the
scores on a standard test are normally distributed with a mean of 104 and a standard deviation of 15. an individuals
Determine the t values that form boundaries of critical region for two-tailed test with a = .05 for each of the given df values.
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