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The above analysis should suggest that the slope of the line relating variance to (1/sample size) is approximately
[p(1-p)],
where p represents the true proportion of red beads in the box.
a. Write a formula for the variance of a sample proportion as a function of p and the sample size, n.
b. Write a formula for the standard deviation of a sample proportion as a function of p and n.
At a particular school with 300 female students, 50 play football, 48 play basketball, and 8 play both. What is the probability that a randomly selected female student plays neither sport?
For the equatorial noontime temperature sequence Xn of Problem 10.4.1, a second sequence of averaged temperatures is Wn = [Xn + Xn-1]/2. Is Wn an iid random sequence?
the following data represent the number of passengers per flight in a sample of 50 flights from wichita kansas to
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
Given that the group is estimating σ as 0.03, and assuming that they are relying on a 98% confidence interval, how high or low would a weekly standard deviation have to be for them to conclude that unusual events are taking place at the plant?
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
Compute the Kappa statistic and its standard error reading reproducibility of the diagnosis of dyspnea in this clinic.
1. in an urn there are two balls one with the number 2 and one with the number 3. when you pick from the urn the chance
The following data are from two separate samples. Does it appear that these two samples came from the same population or from two different populations?
the manager of a video library would like the variance of the waiting times of the customers not to exceed 2.30
1 construct a histogram from the following data using 8 bins that exactly cover the range 5 12 6 29 19 24 29 18 28 16
In 1978, the CPI for Canada was 43.6, but in 1988, the CPI was 84.8. What was the geometric mean annual increase for the period?
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