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Question: Look around your living space or current surroundings, and find a categorical variable for which there are at least three categories and for which you can collect at least 20 observations (example: color of the shirts in your closet). Collect the data.
a. Draw a pie chart for your data.
b. Draw a bar graph for your data.
c. Is one of the pictures more informative than the other? Explain. (Your answer may depend on the variable you chose.)
The data are shown in the table below. Estimate the mean quality, μ, of all studies on the treatment of Alzheimer's disease with a 99% confidence interval. Interpret the result.
After the new advertising campaign was launched, a marketing study found that the mean spending for 300 respondents in the 18-34 age groups was $75.86, with a standard deviation of $50.90. Is there sufficient evidence to conclude that the advertis..
Among 12 adults randomly selected from this area, only 3 reported that their health was excellent. Find the probability that when 12 adults are randomly selected, 3 or fewer are in excellent health.
A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams.
Suppose a random sample of 15 American workers is selected. What is the expected number of these sampled workers who say they will burn out in the near future? What is the probability that none of the workers say they will burn out in the near fut..
Suppose that the researcher finds a moderately strong positive correlation. Describe three different possible cause-and-effect explanations for this relationship.
A sample from a population with μ = 40 and =σ10 has a mean of m = 44. if the sample mean corresponds to a z = 2.00, then how many scores are in the sample?
One environmental group did a study of recycling habits in a California community. It found that 73% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
The methodology to conduct your research. This should make up the majority of your write up. This methodology needs to be stated clearly enough so someone with some level of research knowledge can take that and duplicate your research. Discuss ite..
A company has just manufactured 1295 CDs, and 492 are defective. If 10 of the CD's are randomly selected for testing, what is the probability of the entire batch will be accepted
the guidance system for a rocket operates correctly with probability p when called upon. independently but identical
Calculate 95% confidence intervals for the mean body temperature in each group and comment about the confidence intervals.
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