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What are independent samples?
What is a pooled estimate of variance and why do you need to calculate it?
When do you use a dependent versus an independent sample t test?
Which is the more powerful t test?
What are the assumptions of the independent t test?
What are the mechanics of conducting an independent samples t test?
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
Chi-square test for goodness of fit - difference in the use of the four entrances?
A small town has a population of 20,000 people. Among these, 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
What are the minimum and the maximum starting salaries of the middle 95% of the LU graduates?
If the lowest score you can earn and still be eligible for employment is an 84, what is the mean score for the exam? Round your answer to the nearest tenth.
Estimate a multiple regression model using revenue as your dependent variable. For independent variables, include population, average income, screens, theatre age, and dummy variables for mall and strip mall.
Given that alarm has just sounded, find out the probability that real emergency situation exists?
Assume that a decision maker wants to estimate a population proportion with 90% confidence and a margin of error of ±0.03. The decision maker has obtained a pilot sample of 10.
Using symbols state hypotheses (H 0 and H 1 ) for two-tailed test. Sketch suitable distribution and locate critical region for a = 0.05.
At the .05 significance level, can the developer conclude there is a difference in the mean income? Use the five-step hypothesis testing procedure.
According to a survey 41 % of major US companies electronically monitor their employees. Suppose that 5 such companies are selected independently and at random.
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