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1.Using your own words, what is statistical variability? Why is it important for researchers to understand the variability in their data?
2.Provide examples of (1) a study examining a sample, and (2) a study examining a population. Be sure to explain what differentiates them.
Develop a point estimate of the population mean number of units sold per month. Develop a point estimate of the population standard deviation
Use the steps of hypothesis testing; (b) figure the effect size for the study; And (c) explain your answers to parts (a) and (b) to someone who has never had A course in statistics.
The entire shipment is accepted if only one or non of the tablets is defective. If the defect rate is 5% then what is the probability that the shipment will be accepted?
Develop a correlation matrix. Which independent variable has the strongest correlation with the dependent variable? Does it appear there will be any problems with multicollinearity?
In a Gallup poll of 1,038 adults, 540 said that second-hand smoke is very harmful. What is the percentage of adults who said second-hand smoke is very harmful.
An investment counselor would like to meet with 14 of his clients on Wednesday, but he only has time for 10 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
Garbage quantity is approximately normally distributed. Find the probability that the mean from a sample of 30 families will have between 17 and 18 pounds of garbage.
In forestry there appears to be a correlation between the diameter of a tree at breast height and the totol height of the tree. For the following sample of ten white spruces first construct a scatter plot then find the correlation (r) between heig..
Assume battery life is normally distributed. Batteries in the lower 10% do not meet minimum life requirements. What is the minimum life requirement for a battery?
A sociologist claims that the success of students in college (measured by their GPA) is related to their family's income. For a sample of 20 students, the coefficient of correlation is 0.40. Using the 0.01 significance level
Finds the standard deviation of the time to prepare, copy and mail their tax return is 80 minutes. What is the standard error of the mean in this example?
If we were to ask three people at arbitrary, determine the probability that they will all prefer punk rock?
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