Questions from Engineering Statistics

Q: In an experiment to study the dependence of hypertension on smoking habits

In an experiment to study the dependence of hypertension on smoking habits, the following data were taken on 180 individuals: Test the hypothesis that the presence or absence of hypertension is inde...

Q: A random sample of 90 adults is classified according to gender and

A random sample of 90 adults is classified according to gender and the number of hours of television watched during a week: Use a 0.01 level of significance and test the hypothesis that the time spe...

Q: A random sample of 200 married men, all retired, was

A random sample of 200 married men, all retired, was classified according to education and number of children: Test the hypothesis, at the 0.05 level of significance, that the size of a family is in...

Q: A criminologist conducted a survey to determine whether the incidence of certain

A criminologist conducted a survey to determine whether the incidence of certain types of crime varied from one part of a large city to another. The particular crimes of interest were assault, burglar...

Q: A study was made by a retail merchant to determine the relation

A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. (a) Plot a scatter diagram. (b) Find the equation of the regression line to predict...

Q: According to a Johns Hopkins University study published in the American Journal

According to a Johns Hopkins University study published in the American Journal of Public Health, widows live longer than widowers. Consider the following survival data collected on 100 widows and 100...

Q: The following responses concerning the standard of living at the time of

The following responses concerning the standard of living at the time of an independent opinion poll of 1000 households versus one year earlier seem to be in agreement with the results of a study publ...

Q: A college infirmary conducted an experiment to determine the degree of relief

A college infirmary conducted an experiment to determine the degree of relief provided by three cough remedies. Each cough remedy was tried on 50 students and the following data recorded: Test the h...

Q: To determine current attitudes about prayer in public schools, a survey

To determine current attitudes about prayer in public schools, a survey was conducted in four Virginia counties. The following table gives the attitudes of 200 parents from Craig County, 150 parents f...

Q: A survey was conducted in Indiana, Kentucky, and Ohio to

A survey was conducted in Indiana, Kentucky, and Ohio to determine the attitude of voters concerning school busing. A poll of 200 voters from each of these states yielded the following results: At t...