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When determining the sample size needed to achieve a particular error estimate you need to know sigma. What are two methods of estimating sigma if sigma is unknown?
The following table is from the Social Security Actuarial Tables. For each age, it gives the probability of death within one year, the number of living out of an original 100,000 and the additional life expectancy for a person of that age.
Compute a 99% confidence interval for the true average number of months taken by bankruptcy petitioners to acquire debts listed on their petitions.
If and are the proportions of all college males and females correspondingly, who worked last summer, the z statistic (±0.01) for a test comparing the proportions of college men and women who worked last summer is??
If a single test is run and indicates that oil is present, what is the revised probability that oil is actually present?
If they enroll this many pupils, how much would they need to charge per pupils in order to realize their profit goal of $5,000.
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive statements made about oneself is recorded for each participant during the first meeting.
Furthermore, you could also perform a regression on the data so you have a model with which you can predict other people's IQs based on their mother's IQ.
How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two sided test with α =0.05 if compliance is perfect?
Based off the three requirements that must be met before an analysis of variance test (ANOVA) can be used: Samples must be randomly selected from the populations to be evaluated.
A random variable has the density curve as in the graph below. Find The height of the density curve?
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
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