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The average age for employees at an amusement park is 24 years old with a standard deviation of 2.5 years. Suppose random samples of 40 employees are selected. What would the distribution of average ages from samples of this size look like? Why?
Use the above amusement park scenario to answer the following questions:
Describe a 5-step hypothesis test of multiple means (using the one-factor or the two-factor ANOVA test process) for a particular claim related to your work or life environment.
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
The dependent variable was the child's score on the Behavioral Screening Questionnaire (BSQ), which was filled out by the mother. High BSQ scores indicate more problems. Analyze the difference between means and write a conclusion.
a sample of size 30 has sample mean 20.4 and sample standard deviation 2.1. what is the lower end point for a 95
What are the components of omitted variable bias? What determines whether it is positive or negative?
The amount of underage drinking, as documented in formal incident reports, is compared at "dry" college campuses (no alcohol at all regardless of age).
Compute the 95% confidence interval for the population proportion of registered voters who favor the slow growth initiative.
Let X1 ,X2 , • • • ,X. be a random sample from a distribution with p.d.f. /( x; 8) = ex" - 1 , 0 x oo, zero elsewhere, where 8 > 0. Find a sufficient statistic for (J and show that a uniformly most powerful test of H0 : 8 == 6 against H1 : (J ..
The exercise problem the following information to figure prevalence and incidence rate:
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
Matching problem (case of sampling without replacement). Show that for j = 1, ...,M the conditional probability of a match in the jth urn
1. use a scatterplot and the linear correlation coefficient r to determine whether there is a correlation between the
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