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A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion when using a confidence interval of 99%.
How many plants must be sampled if no preliminary estimate is available?
Remember when calculating a sample size, we need to round UP to the next whole number (not the closest whole number) if needed.
If less than that many plants is sampled, which answer best describes what happened?Plants=_____
If less than that many plants are sampled, which of the following is true?
(A)The error is more than the desired error of 6%.(B)The error is less than the desired error of 6%.(C)The level of confidence must be increased.(D)The confidence interval must be widened.(E)A preliminary estimate is absolutely necessary.
The level of significance indicates the probability of rejecting a false null hypothesis.
The nighttime cold medicine Dozenol bears the label indicating the presence of 600 mg of acetaminophen in each fluid ounce of drug.
At the heart of quantitative research is regression analysis. A regression model simply measures the association of two variables - variation: the dependent variable's observed value
Based on these results, is there significant difference between attitudes for males and for females? Use two tailed test with alpha = .05.
What is the relationship between descriptive statistics and Affirmative Action ? Can using probability in market trending decisions lead to a bad decision? Explain?
A sample of employees at a large chemical plant was asked to indicate a preference for one of three pension plans. The results are given in the following table.
Do you think the Poisson distribution, which assumes independent arrivals, is a good estimation of arrival rates in the following queuing systems? Defend your position in each case.
Each inspector makes his or her inspection at a different time. What is the probability that at least one inspector will find a defective widget?
If Z = 1.96, s = 3, and E = 1, determine the correct sample size.
A chi-square test for goodness of fit is used to test whether or not there are any preferences among 3 brands of cola.
Distances from the past year and carry out a hypothesis test for its suspicion. State the null hypothesis and the alternative hypothesis that it would use for this test.
Suppose you study a random sample of 100 GRE verbal exams. Determine the probability that the average (mean) score in this sample will be between 485 and 515.
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