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1. How large should the size of a random sample be so that we can be 90% certain that the sample mean X will not deviate from the true mean by more than σ/2?
2. Let a fair coin be tossed n times and let Sn be the number of heads that turn up. Show that the fraction of heads, Sn/n, will be near to 1/2 for large n. What can we conclude if the coin is not fair?
3. Suppose that a failure of certain component follows the distribution f(x) = px(1 - p)x for x = 0, 1, and zero, elsewhere. How many components must one test in order that the sample mean X will lie within 0.4 of the true state of nature with probability at least as great as 0.95?
on monday mornings the first national bank only has one teller window open for deposits and withdrawals. experience
the total degrees of freedom for an experiment with n1 10 n2 12 and n3 10 is .1. 292. 313. 24.
What would you expect to be the relative frequency or empirical probability if you increased the number of times the die is rolled?
question 1 the temperature in jihlava follows a normal distribution with mean 50 degrees and standard deviation 10
Running a study comparing 3 different products on five different experimental visits. The same subjects are used for each visit and the same tests are carried out each time on all 3 products. What is the best way to radomise the presentation of the 3..
Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.
On basis of these data, can college conclude that students in new program performed significantly better than rest of freshman class? Use a one-tailed test with α = .05.
The cell phone industry is growing at a rapid pace. Current estimates suggest that 60% of people have cell phones. Suppose 25 people were randomly and independently sampled.
In a normal distribution
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following:
How many rectangles are there in a line of fifteen squares where sides are lined up with the adjacent sides touching the entire length of the side?
Calculate percentage and sectarian angle of each program - construct a frequency distribution and draw a histogram and frequency polygon.
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