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About 30% of adults in United States have college degree.
(probability that person has college degree is p = 0.30). If N adults are randomly selected, find probabilities that
1) exactly X out of selected N adults have college degree
2) less than X out of selected N adults have college degree
3) greater than X out of selected N adults have college degree
Choose your numbers for N and X (portion of N).
you notice in your introductory psychology class that more women tend to sit up front and more men sit in the back.
if it is reported that 1 in 6 eggs is contaminated with salmonella. if salmonella contamination occurs independently in
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days.If a gestation period is 276 days, what percentile among human births is this?
a biologist has found that 40 of all brown bears are infected with trichinosis. 10 brown bears are tested for
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
we randomly choose letters one at a time without replacement from the word choose until both os have been obtained.
To be from the same population? You may assume the that follows a normal distribution. values are: 2.13 1.31 1.91 1.92 1.77 1.64 2.29 1.99 2.33 2.49 2.22
After polling every 8 th graduate, a major university estimated annual salary of its alumni to be $103,000. What sampling technique was used?
Suppose we have run a regression on 48 months of data and the regression equation is Y = 50000 + 1000*x (where x is the month number).
Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.
1. a roulette wheel has 38 slots in which the ball can land. two of the slots are green 18 are red and 18 are black.
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking
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