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A random sample of 70 printers discovered that 30 of them were being used in small businesses. Find the 95 % confidence interval for the true proportion of printers that are used in small businesses.
In selecting a sample from a population for the purpose of making and inference from the sample about the population, it is important
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
A survey of random sample of people leaving an amusement park showed an average expenditure number 10.30k for the evening.
in a group of 135 high school students 57 went to college. more precisely 30 of those who went to college were women
If a student studies for 15 hours, what score should the student expect on the next. What percent of the variation in the points earned on the exam is explained by the number of hours the student studies?
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
When 297 college students are randomly selected and surveyed, it is found that 126 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.
Determine the average number of parts waiting to be worked on, the percentage of time the operator is working, and the percentage of time the machine is idle.
Which of the given experiments can be modelled by Poisson distribution?
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
What differentiates a z test statistic for a population from the z statistic for a sampling of means? Why is there a difference? Consider a normal population with ? = 43 and ? = 5.2. Calculate the z-score for an x ? of 46.5 from a sample of size 16.
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