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A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution.
a. What is the probability that on a randomly selected day she will have no messages?b. What is the probability that on a randomly selected day she will have five messages?c. What is the probability that on a randomly selected day she will have two messages?
Given the following hypotheses: the true mean equals 100 (the null) and the true mean does not equal 100 (the alternate), a random sample of six resulted in the following values:
Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the standard error of the mean in this experiment?
Describe the difference in the determination of a confidence interval of a normal distribution if the variance is known or unknown.
In a statistics lecture, students are asked whether or not they enjoyed doing statistics. Random sample of 50 students was taken and 30 of them said that they enjoyed doing statistics.
Is there enough evidence to support the consumer's conjecture at alpha=.10? 7.2 8.1 7.8 7.4 8.0 8.2 8.1 7.9
Sampling area consisted of an area of 120m x 50m within site two and was bordered by a road on one side and a stream on another.
What is the probability you will win any money in the state lottery and the probability that you will win at least $100
Assume that the lives of all such bulb (approximately) normally distribution. Make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
Should Katie conduct a between-subject ANOVA or a within-subject ANOVA? Describe your answer.
Draw a scatter diagram and consider the correlation for the provided data. Do larger universities tend to have more property crime.
What is the expected number of contracts that it will win? What is the expected profit for each contract? What is the company's expected total profit on these three bids?
Given the following frequency distribution, find out the mean, variance, and standard deviation.
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