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A student takes a 10 question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 70% of the questions correct.
The value of the z score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant explain how the value of z is influenced by each of the following: (a) increasing the difference b/w the sampl..
A random sample of 300 beer drinkers is selected and each member of the sample is asked to choose between two brands of beers: Brand A and Brand B. The results are that 165 prefer Brand A and 135 prefer Brand B.
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.
The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?
Explain the conclusion that there were no statistically significant differences (p ≥ 0.05) between the benefits of behavioral therapy and psychoanalysis when treating an eating disorder.
Suppose we have the following information from a simple regression: What is the coefficient of determination? What is the correlation coefficient?
What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 5 of µ? Use the value 20 for the population standard deviation of scores on this subsection.
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
With this important detail, are there any significant differences with LSD?
If we have 2 groups with 2 characteristics each, what would our critical value be with an alpha of .025?
Find the proportion of employees who are managers and have MBA degrees.
What is the difference in appearance between a t-distribution and a z-distribution? Why do they have slightly different appearances?
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