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The statistical significance of changes to R2 depends on the size of R2. In both examples, consider the benefit of adding three explanatory variables to a regression that already contains two explanatory variables. Assume that the regression is fit to n = 50 observations.
(a) Is an increase from 10% to 12% statistically sig- nificant? Explain.
(b) Is an increase from 90% to 92% statistically sig- nificant? Explain.
The new study is going to use the confidence level of 90%. The estimator or appreciative must be in 1% of the population proportion. Which is the necessary size of the sample?
1.incomes in a certain town are strongly-right skewed with mean 36000 and standard deviation 7000. a random sample of
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
In brief describe three situations in which the 'First In First Out' discipline rule is not applicable in queuing analysis. Provide examples of four situations in which there are limited, or finite population.
a stock just paid a dividend of d0 1.50. the required rate of return is rs 10.1 and the constant growth rate is g
an ecologist wishes to mark off a circular sampling region having radius 10 meters. however the radius of the resulting
Find the mean and standard deviation for the numbers of boys in groups of 51. b) Is the result of 39 boys unusual? Does it suggest that the gender-selection method appears to be effective?
You don't have a population standard deviation but you have sample data. Calculate a sample mean and standard deviation and use the sample standard deviation value to complete the inferential test.
Suppose that the distribution of the body mass index for men has a standard deviation of s = 3 kg/m 2 , and we wish to estimate the mean m using a sample of size n = 49. Find the probability that we would be correct within 1 kg/m 2 .
A bus company claims that the mean waiting time for a bus during rush hour in less than 7 minutes. A random sample of 20 waiting times has a mean of 5.2 minutes with a standard deviation of 2.1 minutes.
Two researchers are both interested in the relationship between caffeine consumption and activity level for elementary school children. Each obtains a sample of n = 20 children.
there are a total of 160 practicing physician in a city. of them 75 are female and 25 are pediatricians of the 75
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