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Use formulas to solve. Scores on an IQ test are normally distributed with known standard deviation 16. You sample 22 students and measure their IQ. The sample mean IQ is 107.8. Calculate a 99% confidence interval for the mean IQ.
First steps. While only 5% of babies have learned to walk by the age of 10 months, 75% are walking by 13 months of age.
Compute the phi-coefficient for these data and compare it with the result from problem 13. You should find that the sample size has no effect on the strength of the relationship.
ANOVA is based on two assumptions about the populations the samples are from. List them.- What is the advantage of random assignment of participants to treatments in an experiment?
The F test is used in Analysis of Variance (ANOVA). When would a researcher use an ANOVA? Explain (one paragraph in length).
What would be examples of valid selection methods used by the human resource department to ensure selecting the appropriate candidate for a job.
Consider this collection of people to be a population. Let X be the number of days for a person sampled at random from this population.
Is there enough evidence to support the physician's claim at? Assume a normal distribution.
The mean starting salary for a graduate in your field? The mean number of games won by your favorite sports team each year? The mean number of games lost by your favorite sports team's rival each year?
For the 30 other hospital patients who did not have a heart attack, the mean cholesterol level was 193.1 with a standard deviation of 22.3. At the 0.05 significance level, is the cholesterol level higher for the heart attack patients?
The value of the test statistic does not lie in the rejection region. Therefore, we accept the null hypothesis.
The euro. Shortly after the introduction of the euro coin in Belgium, newspapers around the world published articles claiming the coin is biased.
A real estate agent has four houses to sell before the end of the month by contacting prospective customers one by one.
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