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A sample of 400 female consumers of a product had a mean age of 33 with a standard deviation of 5, and a sample of 500 male consumers had a mean age of 32 with a standard deviation of 3. Can the mean ages of the female and male populations of consumers be considered significantly different at a significance level of 0.5 (meaning at 95% confidence level)?
The average age for the individuals in the sample is M=48.9 years. How likely is it to obtain a random sample of n=16 jurors with an average age greater than or equal to 48.9?
What is the value of the population mean? What is the best estimate of this value? Explain why we need to use the t distribution. What assumption do you need to make?
Test to determine whether the correlation in the population is zero, versus the alternate hypothesis that the correlation is greater than zero. Use the 0.05 significance level.
a student organization wants to start a nightclub for students under the age of 21. to assess support for this proposal
Determine the following areas under standard Normal distribution curve.
What are the probabilities of accepting lots that are 10 percent, 20 percent, and 30 percent defective? Estimate the probability of accepting a lot that is 15 percent defective.
If the politician is correct, what is the chance that you would observe 9 or fewer accidents involving a teenage driver?
a common mistake many statistics students make is saying we accept the null or prove the null instead of fail to
select a company maybe your employer and assess how it uses data in marketing its products or services. if it is not
testing equality of variances.over the last several years the use of cell phones has increased dramatically. according
the mathematics department is interested in observing the performance of their first-year undergraduate students. the
A statistical study reported that a drug was effective with a p-value of .042. (a) Is this true? An effective sample may be found about 42 times in 1000 samples.
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