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A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 5.07, how large is the sample is needed to get the desired information to be accurate within 0.66 decibels?
A number of minor automobile accidents occur at various high-risk intersections. A study was done. Eight intersections were chosen at random. The number of minor accidents during a 6-month period before and after the modifications were:
question the gallup organization contacts 1709 adult men who are 40 to 60 yrs of age and live in the united states
Find the probability that exactly 3 of the 5 consumers recognize the brand name. Also find the probability that the number who recognize it is not 3.
The firms are actually violating at least one regulaltion, what is the pmf of the number of firms visited by the inspector that are in violation of at least one regulation?
Which of the z-scores below is the smallest one that leads to rejection of the null hypothesis - Identify the population to which the results of the test apply.
Write the hypothesis statement. What distribution are you using?
A group of three students is to be randomly selected froma group of 1 freshman, 1 sophomore, 3 juniors and 3 seniors. Let Y1 and Y2 denote the number of juniors and seniors, a) What is the joint probability distribution for Y1 and Y2?
How does Z the standard normal distribution variable relate to the standard deviation of its distribution and identify the critical value suitable for conducting a two-tail test of the hypothesis at the 2% level.
a young couple eve and steven want to divide their main household chores shopping cooking dishwashing and laundering
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
locate a news article or report in a popular news source such as time newsweek or the wall street journal in which a
Show the odds of any two individuals having the same birthday are slightly greater than 1:1 (1:.9732 actually).
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