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Are young couples who marry or cohabitate more likely to gain weight than those who stay single? Researchers followed 8000 men and women for 7 years.  At the start of the study, none of the participants were married or living with their romantic partner.  The researchers found that women who married or cohabitated during the study gained 0 more pounds than single women, and married or cohabitating men gained, on average, 6 pounds more than single men.    What conclusions can be made based on the results of this study? 

Management at the local Speedy Lube has found that it takes an average of 17 minutes, with a standard deviation of 2.5 minutes, in order to fully complete an oil change service. Management decides to take advantage of the quick service provided with a marketing campaign that promises “50% off your bill if we take longer than 20 minutes”.   After several months, management sees that they are giving out too many discounts, and they want to revamp the program.  They find that this program will be very profitable if they give the discount to no more than 3% of their customers.  If this is the case, how long should they make the guaranteed time limit?

A market researcher wants to know if it is a good idea to open a store in a certain town.  She obtains a list of households in the town and randomly selects 150 households to mail a questionnaire.  Of the 150 mailed, only 4 are returned. 

PROBLEM No. 5 Shown below is a door trap held open by a chain CD which experience a force of 80-lbf as shown. Based on this information answer the following questions. 5.6: What is the z-component of the force vector F? [Enter value lbf to the accuracy of 1-deimal points]  

PROBLEM No. 5 Shown below is a door trap held open by a chain CD which experience a force of 80-lbf as shown. Based on this information answer the following questions. 5.8: When you take the moment of Force F about point B, what is the y-component of that moment? [Enter value lbf and ft to the accuracy of 1-decimal point]  

PROBLEM No. 4 Forces F1 =250 N, F2=300 N and F3=500 N acts on the frame shown below. Based on this information answer the following question: Question 4.8. What is the moment of all 3 forces (F1, F2 and F3) about point B? [Enter value in units of N and m, CCW as positive, CW as negative rounded to the nearest whole number]  

PROBLEM No. 5 Shown below is a door trap held open by a chain CD which experience a force of 80-lbf as shown. Based on this information answer the following questions. 5.5: What is the y-component of the force vector F? [Enter value lbf to the accuracy of 1-deimal points]  

PROBLEM No. 4 Forces F1 =250 N, F2=300 N and F3=500 N acts on the frame shown below. Based on this information answer the following question: Question 4.7. What is the moment of force F3 about point B? [Enter value in units of N and m, CCW as positive, CW as negative rounded to the nearest whole number]  

The main supporting members of a wing are

The pressure produced by a column of fluid is determined by the density of the fluid and its