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When a survey calls residential telephone numbers at random, only 36% of the calls reach a live person. You watch the random dialing machine make 17 calls.
(a) What is the probability that exactly 4 calls reach a person? (Use 3 decimal places.)
(b) What is the probability that 4 or fewer calls reach a person? (Use 3 decimal places.)
Each year the local country club sponsors a tennis tournament. Play starts with 128 participants. During each round, half of the players are eliminated.
If H0 is in reality false and it is legitimate to use a directional H1, which of the following will yield a more powerful test? one-tailed alternative hypothesis
A membership drive in a metropolitan area resulted in 500 new members. What is the probability that 175 or more of the new members are significantly overweight?
What percentage of bags will weigh more than 16.4 ounces? What percentate of bags will weigh less than 15.92 ounces
Test the hypotheses that the average household income in the township is greater than $100,000. Hint: Start by stating the null and alternative hypotheses.
the breaking strength of flimsy safety belts is known to be approximately normally distributed with a population mean
find the area under the standard normal curve between z 0 and z 2.34. round the answer to 4 decimal
Discuss which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis.
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
suppose a life insurance company insures the lives of 1000 men aged 30. if actuarial studies show that the probability
If 15 subjects take a pre-test and a post-test with a mean change score of 1.5, and if the standard deviation of the comparison distribution is calculated to be .5, what is the t score?
random variable x denotes the number of daughters in a family of 2 children. the probability of having one daughter is
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