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In a 1997 Marist Institute survey of 935 randomly selected Americans, 60% of the sample answered yes to the question, "Do you think there is intelligent life on other planets?" (a) What is the sample proportion of Americans who believe there is intelligent life on other planets? (b) What is the standard error of the sample proportion? (c) Calculate a 90% CI for the population proportion of Americans who believe there is intelligent life on other planets.
Select a random variable to represent the category. Produce a probability mass function for that variable, and use it to compute the mean, the median and the variance of the data in the data set. Show the probability mass function, both in tabular..
Determine the confidence interval for population mean and the Superintendent wants to determine the average amount of hours per week the student population studies at home.
What is the expected shape of the distribution of the sample mean?
Describe meaning of alternatives, criteria and states of nature. Explain how are they utilized in decision analysis?
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
The sample size n, the sample means, and the sample standard deviations for the two groups are given
Can we compute the mean length of stay of workers at the company differs from the mean length of stay at that dangerous industry.
If x is a binomial random variable where n = 100 and p = .1, find the possibility that x is less than or equal to 10 using the normal approximation to the binomial.
Can you conclude that the information in the article is untrue? Use the 0.05 significance level. Determine the p-value and explain its meaning.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
Assume that two samples are independent simple random samples selected from normally distributed populations. Use a 0.05 significance level to test the claim that male and female biology students speak the same mean number of words in a day.
Mean=63.6 Standard deviation=2.5 If 36 data points are arbitrarily chosen, determine the probability that mean is less than 64.
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