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A random variable X has the following probability distribution:
X
-1
0
1
Probability
.25
.50
a. Calculate the mean of X.
b. Calculate the variance of X.
c. Calculate the standard deviation of X.
Find the sum of squares due to each of the contrasts and discuss their contribution to the treatment sum of squares.- What null hypothesis is indicated by contrast 1? Test the hypothesis at a 5% level of significance.
For a study conducted by the research department of a pharmaceutical company, 290 randomly selected individuals were asked to report the amount of money they spend annually on prescription allergy relief medication. The sample mean was found to be..
suppose that a study discovered that the average time it took passengers to go through the customs process for
After every score in a sample has been multiplied by 4, the mean is found to be M =48 and the standard deviation is s =12. What were the values for the mean and standard deviation for the original sample?
the probability that a person owns a car pcar 0.80 that a person owns a boat pboat 0.30 and that a person owns both a
For a relative risk of 2.1, what is the percent increase in risk?- For a percent increase in risk of 40%, what is the relative risk?
In the following situations, decide whether you would use a personal interview, observation, mailed questionnaire or telephone interview. Give your reasons.
an airplane holds 20 passengers. the probability a passenger will not show up is .1a. if the airline sells 25 tickets
Explain why the polls that are so frequently quoted during early returns on Election Day TV coverage are an example of cluster sampling.
financial managers inc buy and sells a large number of stocks routinely for various accounts that it manages. portfolio
Assign probabilities to the sample points and then find the probability that the first envelope purchased contains less than $100.
The National Survey of Student Engagement found that 87% of students report that their peers at least "sometimes" copy information from the Internet in their papers without reporting the source.12 Assume that the sample size is 430,000.
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