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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.
If the names of these 100 people in the building are still unknown but a room is allowed to lodge one tenant at most , then are there how many ways of room occupation?
Two-liter plastic bottles used for bottling cola are shipped in lots of 100. Suppose the lots are 5 percent defective. Some bottles leak, some are too small, and so forth.
P(A 1 )= .20, P(A 2 ), and P(A 3 )= .40. P(B 1 I A 1 ) = .25. P(B 1 I A 2 ) = .05. P(B 1 I A 3 )=.10. Use Bayes' theorem to determine P(A 3 I B 1 )
For one of the first statistics exam, the coefficient of determination between hours studied and the grade earned was 80 percent. The standard error of estimate was 10.
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
A case-control study is performed to study the relationship between esophageal cancer and an exposure (exposure A).
A random sample of 25 injections resulted in a variance of 0.135 test if the apparatus has a greater variance than the desired one.
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
The confidence interval estimate of the population mean will be __________ for a 95% confidence level than for a 90% confidence level. Narrower or Wider?
Find the critical F value for the Following,
The manufacturer of the ColorSmart-5000 television set claims that 95 percent of its sets last at least five years without needing a single repair.
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