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A die has half of the faces red and the other half black. The die is rolled 3 times. Let the random variable X represent the number of black outcomes out of three rolls. What is P(1) that is the probability if exactly one black outcome out of three rolls?
Household expenditure for long distance telephone service in City A and average monthly expenditure in City B extends from X to Y, determine the value of X?
For a random sample of 200 undergraduates he finds that 70 have some kind of allergy. What is the standard error of the sample proportions?
A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours. You believe this figure is too large and decide to conduct your own test.
Suppose we wish to conduct a survey of adult US voters about whether or not they intend to vote for an incumbent in congress in the next election. Suppose that we survey 1000 people and 230 say they will.
Will an SRS of size 1785 usually give a result p-hat within plus or minus 3 percentage points of the true population proportion? Explain.
A basketball player makes 80% of his free throws. If he attempts eight free throws during the next game, what is the probability that he will make more than his average?
Find that 116 plan to renew their subscriptions. Use (a=0.01). p = the population of subscribers to Golf Illustrated who renew. Calculate the p-value.
Formulate a research hypothesis to test one population parameter and another to test two (or more) population parameters.
A compute manufacturer is about to unveil a new,faster PC.The new PC is faster but intial tests incidcate there is more variation in the processing time.
According to an early CDC study of 21 patients infected with the swine flu, the average incubation period was 7 days with a sample standard deviation of 4.5 days.
The users are then timed in their ability to setup and program the DVD by performing a series of operations. Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Why or why not?
To test whether there is significant mean difference between two groups using independent sample t test.
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