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In the formula for a variance, what is the sum if we dont square the (x-u) values? Hint: there is a special name for this sum.
an anova table for multiple regression has the required information to compute the coefficient of multiple
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportion of children are overweight?
The correlation between hours spent in the course and exam grades is .8. what percent f variation in exam grades can be explained by hours spent in the course?
The strength of the linear relationship between two numerical variables may be measured by the
Only 10% of those who don't study get an A, what is the probability that someone who gets an A actually studied for the test.
a biologist wishes to estimate the effect t of an antibiotic on the growth of a particular bacterium by examining the
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49. Change the number from 49 to 16 and recalculate the confidence interval. Using results, explain the effect of an outlier or extreme ..
The result for University X was a mean of 5 hours and an estimated population variance of 2 hours; for University Y; and for University Z. What should you conclude? Use the .05 level. What should you conclude? Use the .05 level.
How large could a tumor grow before a researcher might consider it to be an outlier and would want to double check the measurement.
How large a sample should be selected in order to estimate the population proportion to within a margin of error of 0.02 with 97% confidence. The sample proportion from the preliminary sample was 0.18.
A salesperson goes door-to-door in a residential area to demonstrate the use of a new household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) i..
a clinical trial is conducted to compare an experimental medication to placebo to reduce the symptoms of asthma. two
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