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A population proportion is to be estimated. Estimate the minimum sample size needed to achieve the specified margin of error with a 95% degree of confidence.
A researcher wishes to estimate the proportion of adults living in rural areas who own a gun. He wishes to achieve a margin of error of 2.8%. What is the minimum sample size needed?
A) 2552
B) 638
C) 1276
D) 36
Find the standard deviation for the given sample data. Round your answer to one more decimal place than is present in the original data.
The mean score of a college entrance test is 500, the standard deviation is 75 and the scores are normally distributed.
Using two-tailed test with α = .05, is there significant difference between two treatment conditions? Calculate r2 to measure percentage of variance accounted for by treatment effect.
Calculate the control limits for a c chart when Ubar = 3.0%, n = 60, and you collect one sample per hour for 40 hours of production. (2 sets of control limits required, x bar and range)
The mean monthly rent for a random sample of 10 apartments advertised in the local newspaper is $640. Assume that the standard deviation is $90. find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments ..
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
I have 400 feet of lumber to frame a rectangular patio. I want to maximize the area of the patio. What should the dimensions of th patio be.
the personnel director of a large corporation wishes to study absenteeism among clerical workers at the corporations
If you test the null hypothesis at the 0.01 level of significance, is there evidence that the new process has reduced turnaround time? Interpret the meaning of the p-value in this problem.
National data show that, on average, college freshman spend 7.5 hours a week going to parties. President DeRosa doesn't believe that these figures apply at his school; he thinks freshman at his school party less.
a set of 50 data values has a mean of 15 and a variance of 25.nbsp find the standard score of a data value
Out of 1000 respondents to a survey, 250 people planned to purchase a TV of which 200 actually purchased and 50 did not actually purchase. 750 people did not plan to purchase at TV, of which 100 actually purchased and 650 did not actually purchase.
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