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1. A scientist working with new fibers for a tennis ball covering wants to compare the "bounce" of the balls with different coverings. One test will consist of dropping balls with each covering from a specified height and counting the number of times it bounces. Explain why it is better to use several different balls with each covering, rather than dropping the same ball repeatedly.
2. A student wants to measure the volume of liquid in cans of soft drink to see how it compares to the nominal volume of 12 oz. printed on the can. Suggest some sources of measurement error in this experiment, and discuss how the measurement errors could be reduced or avoided.
Construct a grouped frequency distribution using six classes.
Suppose that 20% of all homeowners in an earthquake-prone area of California are insured against earthquake damage. Four homeowners are selected at random; let x denote the number among the four who have earthquake insurance.
Is there a significant relationship between "sibs"and "childs"? Explain how you reach your decision (hint: p-value):
A physician's health study of the effectiveness of aspirin in the reduction of heart attacks was begun in 1982 and completed in 1987. Of 11,037 male medical doctors in the United States who took one 325 mg buffered aspirin tablet every other day
a sports card company produces many cards a year both high and low end. an amateur statistician has decided to estimate
a short quiz has two truefalse questions and one multiple choice question with four choices. a student guesses at each
What would be your best point estimate for average Sales in weeks for which Newspaper advertising were $1 million? What would be an appropriate interval estimate for this?
Test the hypothesis at the 0.05 level. What is the value of the test statistic calculated from the sample data? What is the critical value of the test statistic?
Provide an example of a couple of variables that we work with that could meet the binomial criteria above.
suppose 40 of the students of a campus are women. if 20 of the women and 16 of the men of this campus are a students
What is the advantage of a randomized experiment in which the investigators randomly assign treatment conditions to subject over an observational study in which the subject self-select the treatment groups?
Find the critical t-value that corresponds to 90% confidence. Assume 90 degrees of freedom.
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