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The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female Hispanic drivers in Boston; 68 of these drivers were wearing seat belts. We wish to find if these data give good reason to conclude that more than half of Hispanic female drivers in Boston wear seat belts.
The heights of 40 randomly selected people and the heights of their mothers are recorded. Statdisk is used to run a linear correlation and regression analysis. The partial results are provided below:
At.01 significance level, can we conclude that there is more variation in selling prices of oceanfront homes?
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
Conduct a hypothesis test at the 6% level of significance to determine whether there is evidence that the true mean fill volume for all jugs of softener differs from 120 ounces.
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
First National Bank and City National Bank are competing for customers who would like to open IRAs. 32 weeks are randomly selected for First National Bank and another 32 weeks are randomly selected for City National.
Suppose X is a random variable with mean u and variance sigma2, Calculate the mean vector and variance matrix of the random vector Y = (X,2+3X)?
Create a 98 percent confidence interval for the population mean.
Assume a restaurant business succeeds 60% of the time. Suppose that there are three such restaurants open in your city. When they don't compete with one another
At the .05 significance level, is the number of units produced on the afternoon shift larger?
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
Your company has experienced problems with employee morale and productivity. The consultant that was hired submits a report that includes opinions and data collected from 300 secretaries and clerks as well as 75 senior managers.
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