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Q1) To evaluate the true mean weight of packages received by parcel service, 39 packages are arbitrarily chosen and weighed. Sample has mean weight of 15.3 pounds and standard deviation of 1.9 pounds. Construct a 95% confidence interval estimate for true mean weight of all packages received by parcel service.
Q2) Sociologist develops the test to measure attitudes about public transportation, and 27 arbitrarily chosen subjects are given test. Their mean score is 76.2 and their standard deviation is 21.4. Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
Use a scatter plot to determine the relationship between the x values and the y values.
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
If the voice identifications were made by random guess, find the probability that all 9 victims would select the same person?
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
The heights of young women are approximately normal with mean 65 inches and standard deviation 2.5 inches.
The following frequency distribution was obtained. The data values are in hours. Construct a histogram for the data .
Solve linear program graphically
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
Find the mean and standard deviation of X, the number of students in class, who will develop influenza.
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
A certain airplane has two independent alternators to provide electrical power.
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