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A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
If the process mean and standard deviation remain constant, what proportion of the output from this process will be defective?
Construct a scatterplot, find the value of the linear correlation coefficient r, and find the P- value using a= 0.05. Is there sufficient evidence to conclude that there is a linear correlation between systolic measurement and diastolic measuremen..
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
At the .05 significance level, can we conclude that the guideline is still reasonable?
The F-test cannot be used to answer whether or not there is a significant difference between the means.
The new independent variable improves the predictive power of the regression model.
In what height interval must the company expect to determine middle 70% of kindergarteners?
The men took an average of 20.5 hours per year of personal time with a standard deviation of 2.75 hours. What is the pooled estimate of the variance? Round to three decimal places.
For each year, create a bar chart and a pie chart.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Note that under the exponential assumption, P(X>t) = exp(-t/theta). If t=5, use the result from (a) to find an approximate one-sided lower 95% confidence limit for theta.
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