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Assume that the number of new visitors to a website in one hour is distributed as a Poisson variable. The mean number of new visitors to the website is 4.0 per hour. What is the probability that in any given hour
a. zero new visitors will arrive at the website?
b. exactly one new visitor will arrive at the website?
c. two or more new visitors will arrive at the website?
d. fewer than three new visitors will arrive at the website?
in a trial of 250 patients who received 10-mg doses of a drug daily 30 reported headaches as a side effect.a obtain a
You want to estimate today's mean temperature, so you make a series of measurements (taken as a sample) throughout the day. The mean of these measurements is 63 degrees Fahrenheit, and their standard deviation is 3.4 degrees Fahrenheit.
If 87 % of people have brown eyes and 4 people selected at random, find the probability that at least one of them has brown eyes
Determine the p-value and interpret its meaning and what assumptions do you have to make about the two populations in order to justify the use of the t test?
A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk di..
if you want to be 95 confident of estimating the population proportion to within a sampling error of plus or minus 0.05
What is the probability of choosing a yellow candy, what is the probability that the candy is blue, red, or green and what is the probability of choosing an orange candy?
The process is designed to produce tees with a mean weight of .252 ounce. To investigate whether the injection molded is operating satisfactorily, 40 tees were randomly sampled from the last hour's production.
a random sample of 20 items is selected from a population. to determine the appropriate critical t-value what number
Prepare a report with your rankings of the judges. Also include an analysis of the likelihood of appeal and case reversal in the three courts. At a minimum, your report should include the probability of cases being appealed and reversed in the thre..
Suppose local monthly cell phone bills are normally distributed with a standard deviation $12. What is the probability that a randomly selected cell phone bill is between $30 and $55?
A sample of 400 individuals participated in the taste test and 80 indicated they like the taste. At a 5% significance level, test to determine if at least 22% of the population will like the new soft drink.
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