Expected number of spots showing
Suppose that the number of dice thrown is a binomial random variable with n = 10 and p = 0.98. What is the expected number of spots showing on the thrown dice? Expected number of spots =
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Hypothesis Testing for a t-test. Monitoring Lead in Air. Listed below are measured amounts of lead in micrograms per cubic meter or ug/m to the third power in the air. The EPA has established an air quality standard for lead of 1.5 micrograms per
The mean and the standard deviation of the sample of 100 bank customer waiting times in Table 1.8 are (xbar=5.49) and s=2.317. Calculate a t-based 95 percent confidence interval for U, the mean of all possible bank customer waiting times using the
sequence of independent Bernoulli trials with p = 0 2. What is the expected number of trials to obtain the first success?
A survey reported that 70% of those responding to a national survey of college freshmen were interested in taking summer courses. Using the sample size of 49, calculate a 95% confidence interval for the proportion of college students who are inter
A random sample of 30 adults drawn in City 1 had 6 senior citizens. A random sample of 40 adults drawn in City 2 had 7 senior citizens. Can we conclude that the proportion of seniors in the two populations are different? Use significance level of
The number of power surges at a nuclear plant follows a Poisson distribution with an average of .5 power surgers per day.
A club has 200 members, 45 of whom are lawyers, 38 of the memebres are liars, while 132 are neither lawyers nor liars. What is the probability that if a random person is randomly chosen from the group of lawyers, the person will be a liar?
Use the binomial table to find the probability of rejecting the null hypothesis when using this rejection region if p=0.30 or the rejection region defined above, find beta if p
The sample mean is 49, and the population standard deviation is 5. Conduct the following test of hypothesis using the 0.10 significance level. What is the value of the test statistic? What is the p-value?
It has been reported that men are more likely than women to participate in online auctions. In a recent survey, 65% of respondents reported that they had participated in an online auction. In this same survey, 45% of the respondents were men and
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