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Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
A study examining the effectiveness of a 7 Minute Screen test for Alzheimer's disease. The study evaluated the relationship between scores from the 7-Minute Screen and scores for the same patients from a set of cognitive exams that are typically used to test for Alzheimer's disease. For a sample of n = 9 patients, the scores for the 7-Minute Screen averaged M = 7 with SS = 92. The cognitive test scores averaged M = 17 with SS = 236. For these data, SP = 12.
a. Find a regression equation for predicting the cognitive scores from the 7-Minute Screen scores.
b. What percentage of variance in the cognitive scores is accounted for by the regression equation?
c. Does the regression equation account for a significant portion of the variance in the cognitive scores?
Use alpha = .05 to evaluate the F-ratio.
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
Florida State University administers a mathematics placement test to students where they 1st enter the university.
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
Indicate which would be the independent variable and which would be the dependent variable in each of the following:
The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
Describe why the normal distribution can be used as an approximation to binomial distribution. What conditions should be met to use the normal distribution to approximate the binomial distribution? Why is a correction for continuity essential.
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
Make up a scatter diagram with 10 dots for each of the following situations:
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
If we repeated this procedure many, many times, only 5 percent of the 95 percent confidence intervals would fail to include the mean Math SAT score of the population of all students at this college.
In general, determine the standard score a measure of?
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