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In Australia, 30% of the population has blood type A +. Consider X, the number having A + blood among 18 randomly-selected Australians. (a) What is the probability distribution of X? [3] (b) Calculate: (i) the mean and standard deviation of X. [3] (ii) P(X > 12) [2] (iii) P(5 ≤ X < 10) [2] (c) If, in such a sample, you found only 5 people with A + blood, would this be an unusual sample? Justify your answer using an appropriate probability calculation
Recall the scientific method discussed during the lectures. Now suppose that there are two groups of participants in a study that measures the effect of marketi
a study of peach trees found that the average number of peaches per tree was 825. the standard deviation of the
Assume we interested in relationship between the age of individual, as measured by visits. Suppose after selecting 15 members the observation:
a february 2009 poll conducted by the marist college institute for public opinion in poughkeepsie new york asked a
What is the probability that exactly 5 nonconforming parts are produced during a 1-hour period? What is the probability that at least 5 nonconforming parts are produced during a 1-hour period?
Classify each statement as an example of classical probability, empirical probability, or subjective probability.
a. Find the mean value of x (the mean number of systems sold). b. Find the variance and standard deviation of x. How would you interpret these values? c. What is the probability that the number of systems sold is within 1 standard deviation of its me..
The resistance for resistors of a certain type is a random variable X having the normal distribution with mean 9 ohms and standard deviation 0.4 ohms.
doug needs to construct a 98 confidence interval for the mean diameter of 3 inch schedule 40 drain pipe. he samples 25
Do these data support the claim in the article about texting versus calling? Justify your answer with appropriate evidence.
Step 1 of 5: State the null and alternative hypotheses for the test. Step 2 of 5: Find the value of the standard deviation of the paired differences. Round your answer to one decimal place.
A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees.
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