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Based on previous studies, researchers believe that 6% of children are born with a gene that is linked to a certain childhood disease. If the researchers test 95- newborns for the presence of this gene, would it be unlikely for them to find fewer than 25 children with the gene?
A standard die has its faces painted different colors. Faces3,4,6 are red, faces 2 and 5 are black and face 1 is white.
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
Suppose the true population proportion is 68%. What is the probability of observing a sample proportion 64% or smaller.
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
State the null hypothesis and the alternate hypothesis. State the significance level. State the decision rule. Give the formula for the test statistic.
What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
Write a short paragraph explaining to the psychologist what can be concluded from this output (assuming the technical conditions are met).
Describe how the confidence intervals will change depending on whether the population standard deviation is known or unknown.
If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.
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