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The general social survey is an annual survey given to about 1,500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe the respondents' views of employment. A recent survey contained the question "How important to your life is having a fulfilling job?" Of the 264 college graduates surveyed, 103 chose the response "very important." Of the 123 people surveyed whose highest level of education was high school or less, 30 chose the response "very important."
Based on these data, can we conclude, at the 0.01 level of significance, that there is a difference between the proportion of U.S. college graduates who would answer "very important" and the proportion of all U.S. adults whose highest level of education was high school or less who would answer "very important"?
Perform a two tailed test.
When the p-value is used for hypothesis testing, the null hypothesis is rejected if
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Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
Construct a 95% confidence interval on the population mean for the following sample data set:
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The post-anesthesia care area (recovery room) at St. Luke's Hospital in Maumee, Ohio, was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25. A random sample of 15 days revealed the ..
What are some real life examples of the use of Chi-Square tests using contingency tables? Why is a test, which is testing significant differences among means called Analysis of Variance?
We suggest that you use the graphical approach to CVP analysis to solve the following problem, but you may use any other method to find the answer.
What is the difference between a null hypothesis and an alternate hypothesis? Explain what is meant by the critical value of a statistical value.
Compare a three-month moving average forecast with an exponential smoothing fore-cast for a = 0.2. Which provides the better forecasts using MSE as the measure of model accuracy?
Compute the probability which we will get the sample mean greater than 21; which is , compute P(x > 21). Compute the probability that we will get the sample mean less than 19.385; that is, compute P(x
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