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When determining the sample size needed to achieve a particular error estimate you need to know sigma. What are two methods of estimating sigma if sigma is unknown?
You're asked to determine whether the workers live in the community. Your personnel department provides the following table:
Standard deviation of 6.9 centimeters.assuming that the heights are recorded to the nearest half-cm, how many of these students would you expect to have heights less than 160.0 centimeters.
Using an appropriate graphical display, describe the relationship between DNA and phytopigments and fit a regression line to the data. Write down the equation of the model and interpret all parameters in the model.
Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain.
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
State the null hypothesis and the alternative hypothesis and compute the value of the test statistic and what is your decision regarding the null hypothesis?
The probability that a parolee will commit a crime while on parole is 0.68. A parole officer is in charge of 8 parolees. What is the probability that at least 7 of them will commit a crime while on parole?
"Factorial" means that the treatments are formed from more than one factor. What are the factors? What do "double-blind" and "placebo-controlled" mean?
Assume each shot is independent of the others. If she shoots 6 arrows, what's the probability of each result described below. Her first bull's-eye comes on the third arrow.
Draw frequency polygons for each of the four distributions (assume they are normal) with the raw scores indicated for all six of the standard deviation units. a) Mean= 15 SD= 3
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?
How large should the sample size be if she wishes to be accurate within $0.10. A previous study showed that the standard deviation of the price was $.12.
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