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A brand name has 60% recognition rate. if the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers, find the probability that exactly 3 of the 5 consumers recognize the brand name. Also find the probability that the number who recognize the brand name is not 3.
A safety engineer claims that only 40% of all workers wear safety helmets when they eat lunch at the workplace. Assuming that his claim is right, find the probability that at most 4 out of 6 workers randomly chosen will be wearing their helmets wh..
In a poll to estimate presidential popularity, each person in a random sample of 1000 voters was asked to agree with one of the following statements:
What was the probability that a student worked a part time job or made the Dean's list. Interpret the results.
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
Is there a significant difference in mean fetal heart rates by position? Run the test at a 5% level of significance.
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
Change the frequencies to percentages - is there a group more likely to get high salaries.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
The amount of pyroxidine (in grams) per multiple vitamin is normally distributed with a mean = 110 grams and a variance = 25 grams. A sample of 25 vitamins is to be selected.
The point estimate for the difference between the proportions is:
For each of the following populations, would a score of X = 50 be considered a central score (near the middle of the distribution) or an extreme score (far out in the tail of the distribution)?
Suppose that you're charged with comparing results of standardized tests from four different school districts. What statistical technique would you choose to use?
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