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A kinesiologist would like to compare the left hand and right hand gripping strengths of left-handed individuals. A scale is placed on a shelf and gripping strength will be measured by how tightly an individual is able to squeeze the scale with one hand.
Explain how a matched pairs experiment should be conducted to compare left- and right-hand gripping strenghts. Be sure to explain the role of randomization, and why it is important in this experiment.
From her firm’s computer telephone log, an executive found that the mean length of 64 telephone calls during July was 4.48 minutes with a standard deviation of 5.87 minutes.
A random samle of 12 college freshmen is obtained. The probability that exactly two of the 12 freshmen will not return for their sophmore year is?
Determine if there is a linear correlation between annual income and the amount of insurance? What is the linear regression line for this data?
The hole diameter is carefully measured (in cm) for 12 randomly chosen parts. At α = .05, do these independent random samples prove that the new process has smaller variance?
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A group and the trace group? Implement the test in Problem 10.68, and report a two tailed p value.
Batch is acceptable. What sample size is recommended for the hypothesis test? Use 30 hours as an estimate of the population standard deviation.
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
Given the standardized normal distribution (with a mean of 0 and a standard deviation of 1, as in Table E.2), what is the probability that:
Estimate the relative risk of neurological impairment for children exposed to secondary smoking, and calculate a 95% con?dence interval for this risk.
About 72% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
What is a 99% confidence interval for the true proportion of dentists in the population that would make such a recommendation?
What is the difference between McNemar's Test and the chi-square test for 2X2 tables? When do we use each test?What is a discordant pair and concordant pair? Also, which type of pair is used in the McNemar's test?
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