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Confidence intervals, again. Several factors are involved in the creation of a confidence interval. Among them are the sample size, the level of confidence, and the margin of error. Which statements are true?
a) For a given sample size, reducing the margin of error will mean lower confidence.
b) For a certain confidence level, you can get a smaller margin of error by selecting a bigger sample.
c) For a fixed margin of error, smaller samples will mean lower confidence.
d) For a given confidence level, a sample 9 times as large will make a margin of error one third as big.
A researcher decides to test her hypothesis that some toys are more fun to play with than others, so she decides to compare fun toys or blocks with “un-fun” toys or stuffed animals
1. a researcher for reasons passing understanding wishes to assess the association between gender and total cholesterol
Fill in the table below with the frequencies and percentages for each category. Remember to create a table whose categories are arranged logically
every generation faces new challenges and new problems. what do you think is the biggest difference between your
Effect of Screening Mammography on Breast-Cancer Incidence
The central university has a student population of 60000. The university is interested in determining what proportion of them is in favour of a new grading system.
A sample of 60 night-shift workers showed that the mean number of units produced was 351. At the .05 significance level, is the number of units produced on the night shift larger?
What other information would you like to know to answer the question about salary equity between the genders? Why?
the table below shows five baskets containing different quantities of oranges.baskets number of oranges 1 30 2 18 3 30
A state meat inspector in lowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled " 3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
A CFR system with λ = 0.0004 has been operating for 1000 hr. What is the probability that it will fail in the next 100 hr? The next 1000 hr?
a suppose that a newspaper in wisconsin wants to take a statewide survey concerning state budgetary issues. the
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