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Suppose a genetic trait in Impalas (Aepyceros datoadeni) occurs more often in males. The sex ratio in impalas is bout 50 males to 100 females. 90% of males have this trait, but only 30% of females.
a) What is the probability that a randomly chosen impala will have the trait?
b) Suppose a randomly picked impala has the trait (i.e., you pick an impala without paying attention to the sex), what is the probability this impala is a female?
Rachel determines the mean score on this test for a random sample of third graders from her school district.
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
q1. a market researcher wants to test to determine if families of four in city a spend less per week on average than
Land in Canada. Choose an acre of land in Canada at random. The probability is 0.45 that it is forest and 0.03 that it is pasture.
in a poll conducted by the nanos research on may 1 2011 38.7 of n 702 decided voters supported the conservative.a find
Tug of war is a game played by most people in their youth. In the wild, animals tussle with each other in similar ways but with much more
Alice and Bob are 2 of the 111 people. Assume for this part only that Alice's 5 favorite movies out of the 11 are random, with all sets of 5 equally likely.
a test for breast cancer correctly classifies 95 of malignant tumours as malignant but also incorrectly classifies 1 of
What happens to the confidence interval when we go from a 95% confidence level to a 99% confidence level? Is this desirable? When would we want to use a 99% confidence interval?
Find the 99% confidence interval of the true mean of the noise levels in the operating rooms. assume the variable distributed. Round your answers to two decimal
Test the null hypothesis that there is no difference between the two age groups by conducting a difference-in-proportions test on the proportion of people who are rooting for Bonds.
1. Is there an alternative to the current operations approach of the maintenance department? 2. How could production make up for lost output resulting from scheduled maintenance
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