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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.
What is approximately the largest sample mean of another sample of n= 16 participants you would expect to obtain from this finite population?
A fair coin is flipped 3 times. Compute the odds of flipping 3 tails.
What is the null hypothesis in a chi-squared test of independence? List the assumptions under which the linear regression model is supposed to work.
Do sit down restuarant franchises and fast food franchises differ significantly in stock price? Specifically, is the average stock price for sit-down restaurants different from the average stock price for fast food restaurants?
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
The lifetime of African Cichlids is unknown but the sample of 75 cichlids were taken and its mean life time was 5.2 years with a margin error of 420 days for 95% confidence a) What is the 95% confidence interval for the lifetime of the African fish..
Using the simple test of independence (described in the lecture), decide if the events high calorie and high fiber are independent or dependent. Show your work.
Simulate arrival of cars at service station for one hour using different stream of random numbers from those used in (a), and calculate average time between arrivals.
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the SD is $100.
How can you answer the dual simplex question with maximization objective function and also explain difference between m tecnique and two phase method?
In the past HR uses an average of 25 vacation days per worker in order to make available man-hour and payroll predictions. Is there evidence to show that the number of vacation days decreased over the past year? Use alpha = .05
By how much does the standard error of x-bar change if the sample is increased to 100?
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