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In developing a regression equation from the following data to predict y by x, the y intercept is:
Is it reasonable to conclude that the mean weekly salary of nurses is higher? Use the .01 significance level. What is the p-value? Interpret the p-value.
A sample of 200 observations from the first population indicated that X1 is 170. A sample of 150 observations from the second population revealed X2 to be 110. Use the .05 significance level to tes
A sample of 50 observations is selected from a second population with a population standard deviation of 0.66. The sample mean is 2.59. Conduct the following test of hypothesis using the .08 signif
A sample of 200 observations from the first population indicated that X1 is 170. A sample of 150 observations from the second population revealed X2 to be 110. Use the .05 significance level to test
Among drivers who drive daily about 40% have gotten a speeding tickets at one point or another. There is a statistics class of 80 students and 10 of them can actually drive every day. Using this inf
Reported crimes are believed to occur at random at different rates for different types of crime. the incidence rate for a particular type of crime in city B is 3.0 per week.
What is an example in the world around you for which you would use a Chi-square analysis? Be specific. Describe what chi square tests and how your example is relevant.
What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for which you might expect interactions?
You must define any term that you use. Remember that this is for a novice; use an example to go through the ANOVA process. Be sure to explain how significance is determined in simple terms as well.
How would you explain the analysis of variance, assuming that your audience has not had a statistics class before? Be specific.
Write this estimate by hand on your histogram, and show on your histogram which area is being used as your estimate. Also, compute and write the theoretical value for this probability using the tabl
1000 students took a national aptitude test. As a result, the mean score was 71 and standard deviation was 6. Assuming that distribution ofthe scores is normal, what is the probability that a score
a. Determine the regression equation. b. What is the value of R? Comment on the value.
Conduct a test of hypothesis to determine whether either independent variable has a coefficient equal to zero. Would you consider deleting either variable from the regression equation? Use the .05 s
Compute the standard error of estimate. About 95% of the residuals will be between what two values? Determine the coefficient of multiple determination. Interpret this value.
What effect would installing 18cm of insulation instead of 15 have on the monthly natural gas consumption (assuming the outdoor temperature remains at 10 degrees Celsius)?
As age increases by one year, how much does estimated performance on the new machines increase?
Performance on the new machine is designated Y. Thirty machinists were selected at random. Data were collected for each, and their performances on the new machines were recorder. A few results are:
Are there significant differences in the Cortisol levels of these three groups?
Does observation and competition pressure make cycling performance improve?
Find the sampling distribution of the medians for samples of size 3 without replacement. Display this distribution in the following table
How small can p be and still give a 50-50 chance that there is intelligent life in at least one other solar system in our galaxy?
Select one of the 1000 students at random and let the random variable X equal the size of that student's class. Define the pmf of X.
Calculates a 95% confidence interval for the population proportion to be (0.546, 0.674). Determine what the sample proportion must have been, and explain why.