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A researcher is interested in the relationship between hourly earnings and years of education. Data was collected from 100 individuals. Average hourly earnings are $20 per hour with a standard deviation of $6 per hour. Average years of education are 15 years with a standard deviation of 4 years. The correlation between the two variables is 0.4. Hourly earnings are regressed on years of education. What is the slope of the OLS regression line?
what are the probability of you having the disease?
A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
There are 20 qualified applicants for 5 trainee positions in a fast-food management program. How many different groups of trainees can be selected?
When redesigning the fighter jet ejection seats to better accommodate women, which probability is more relevant: The result from part (a) or the result from part (b)? Why?
Estimate the true mean price for this particular model with 95% confidence?
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 ..
A real estate broker hoped to develop an equation that could be used to predict the sales price of homes in a certain suburb. It seemed to him that the most important variable
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
Since purchasing the software the average delivery time over twenty delivery days was 8.6 hours. At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
Define mixed method research and describe its strengths. Provide an example of when it is appropriate to apply mixed method research in the human services field. Summarize how scientifically sound research supports the function of a human services..
This is an Excel sheet that calculates both probabilities and percentiles for any normal or standard normal probability distribution. Replaces normal probability tables.
A sample of 50 retirees is drawn at random from a normal population whose mean age and standard deviation are 75 and 6 years, respectively.
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