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A sociologist wants to find the relationship between attitude toward women's right (numerical variable with range 0-100), age of the respondent in years, gender, and level of education (less than high school, some college, bachelor's degree or higher).
State the null hypothesis. Calculate the difference between the proportions or means. Calculate the standard' error of the difference in proportions or means.
A steel company is producing steel for a new contract. The contract specifies the information in the following table for the steel. MATERIAL MINIMUM MAXIMUM Maganese 2.10% 3.10% Silicon 4.30% 6.30% Carbon 1.05% 2.05% The steel company mixes batches o..
A study done by the Ohio State University Medical Center examined whether or not taking an aspirin a day would help colon cancer patients reduce the chance of getting subsequent colon polyps. 635 patients with colon cancer participated; 317 of ..
Consider the following test of whether a coin is fair. Toss the coin five times. If the coin lands either all heads or all tails, reject Ho: p= 1/2. (The p denotes the chance for the coin to land on heads.) Complete parts a and b. (a) What is the pr..
Each of the following proportions is based on survey responses. For each proportion, use the ±2 rule of thumb to determine the 95 percent confidence interval. When asked if they are satisfied with their financial situation, .29 said "very satisfied" ..
Identify the type of study proposed and indicate its specific strengths and weaknesses and
A more general exponential reliability model may be defined by R(t)=a^(-bt) where a>1, b>0 and a and b are parameters to be determined. Find the hazard rate function, and show how this model is equivalent to R(t)=e^-(lambda*t).
Describe a circumstance when the mean is a very useful measure and a circumstance when it is misleading
Calculate degrees of freedom and the critical values, or cutoffs, assuming a two-tailed test with a p level of 0.05, for each of the following designs: hours spent studying per week was correlated with credit-hour load for 72 students Twenty-seven co..
A marketing analyst in a large grocery store chain
An automobile manufacturer has problems with sticking accelerator pedals
In a random sample of 28 sports cars, the average annual fuel cost was$2929 and the standard deviation was $786. Construct a 90% confidence interval for u. Interpret the results. Assume the annual fuel costs are normally distributed.
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