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The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. The following is a summary of data on stance duration (ms) for samples of both older and younger adults. Assume that both stance duration distributions are Normal.
Age Sample Size Sample Mean Sample SD
Older 28 801 117
Younger 16 780 72
a. Calculate and interpret a 99% CI for true average stance duration among elderly individuals.
b. Carry out a test of hypotheses at significance level 0.05 to decide whether true average stance duration is larger among elderly individuals than younger individuals.
more genetics. in problem 33 we learned that for some diseases such as sickle cell anemia an individual will get the
if all cars in the usa ran with petrol blended with 20 bioethanol produced by enzymatic hydrolysis of cellulosic
the mean noise level in the 171 ward areas was 58.0 decibels and the population standard deviation is 4.8. find the
To test the null hypothesis that the mean waist size for males under 40 years equals 34 inches versus the hypothesis that the mean differs from 34, the following data were collected: 33, 33, 30, 34, 34, 40, 35, 35, 32, 38, 34, 32, 35, 32, 32, 34, 36,..
Write a brief statement of purpose of the study. Define the population. State the hypotheses for the study. Select an a value
Suppose that 15% of the population is left-handed. If 20 people are selected at random, find the probability that exactly 4 of them are left-handed.
Test at the .05 significance level the null hypothesis that the population proportions are equal against the two-tailed alternative.
a student has five motor vehicle accidents in one year and claims that having five accidents is not unusual. use the
Does the evidence suggest that postpartum women do not get enough sleep? Use =0.05 level of significance. How is the problem set up using the classical and P-value approach.
determine the critical region and critical values for z that would be used to test the null hypothesis at the given
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
Jasmine is an African American graduate student. She is conducting research on the effects that affirmative action programs have had on American corporations.
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