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Astronomers estimate that as many as 100 billion stars in the Milky Way galaxy are encircled by planets. If so, we may have a plethora of cosmic neighbors. Let p denote the probability that any such solar system contains intelligent life. How small can p be and still give a 50-50 chance that we are not alone?
suppose iq scores were obtained from randomly selected couples. for 20 such pairs of people the linear correlation
a radio manufacturer claims that 65 of teenagers 13 to 16 years old have their own portable radios. a researcher wishes
let x and y be independent exponential random variables with respective parameters 2 and 3. find the cdf and density of
1. What is the current status of the housing stock in the county?
Expand the above table to show the change in Ms A's investment portfolio over the year, and construct a suitable diagram to illustrate that information.
a newspaper finds that the mean number of typographical errors per page is four. find the probability that more than
Mean income of $30,000and a standard deviation of $3,000. What is the income that separates the top 25% from the lower 75% of the incomes?
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes.
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
In the case of Castenedav. Partida, it was found that during a period of 11 years in Hilda County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry.
the average price of homes sold in the u.s. in the past year was 220000. a random sample of 81 homes sold this year
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
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