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Early in 2007 consumer reports published the reuslts of an extensive investigation of broiler chickens purchased from food stores in 23 states. tests for bacteria in the meat showed that 81% of the chickens were contaminated with campylobacter, 15% with salmonella, and 13% with both. What's the probability that a tested chicken was not contaminated with either kind of bacteria?
What is the probability of finding exactly four watch soap operas?
The bacteria Escherichia coli are commonly found in the human bladder. Suppose that 3000 of the bacteria are present at time t-0. Then t minutes later, the number of bacteria present can be approximated by:
The corporation there's a pretty good chance the average number of days absent would be 12 or more. that's what happened to us chance variation. Is this a good defense? Justify your answer.
Determine the probably of selecting a female or an accounting major? Which rule of addition did you apply?
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
In a random sample of 400 items, 88 are defective. If the null hypothesis is that 20% of the items in the population are defective, what is the value of ZSTAT?
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
A sample of 30 students are tested (sample mean=58, standard error=3.2). Compute a 99 percent confidence interval based on this sample's data. How do these students compare to the national sample?
Please answer the following: Prove that the square of an even number is even. Make sure to show all steps required.
Use the normal distribution to approximate the desired probability. Find the probability that in 200 tosses of a fair die, we will obtain at exactly 30 faces.
A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination.
Find a 95% confidence interval for the true proportion of patients who experienced cotton mouth. Show your calculations and/or explain the process used to obtain the interval.
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