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The following sample was obtained from a population with unknown parameters.
Scores; 6,12,0,3,4.
a.) compute the sample mean and standard deviation. (Note that these are descriptive values that summarize the sample data.)
Using a test, 80% of Down's Sydrome cases can be identified, while 5% of normals are detected as positive. What is the sensitivity and specificity of the test?
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.) Use the five steps of hypothesis testing and explain your findings.
Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
What is the margin of error for a 95% confidence interval for the difference of the two means (low capacity - high capacity)? (Answer to the nearest hundredth.)
A teacher figure that final grades in the statistics department are distributed as A,25%, B, 25%, C, 40%, D, 5%, F, 5%. At the end of the randomly selected semester, the following number grades were recorded.
Of 144 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the percentage of all adults in the town who smoke.
How do we use a least squares regression line? Please explain in your own words. What is the range for the coefficient of determination? Please explain in your own words.
Crete a 90% confidence interval for mean Secchi dish measurement.
The ages of the automobiles are equally distributed among the three categories? what would the results suggest to a tire manufacturer?
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
1. according to the yankee group 53 of all cable households rate cable companies as good or excellent in quality
You're the production manager for operation that produces circuit boards. Each board is tested at the end of manufacturing process. Rejected boards are discarded and have no future value.
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