Question

In: Math

A trucking company wants to find out if their drivers are still alert after driving long...

A trucking company wants to find out if their drivers are still alert after driving long hours. So, they give a test for alertness to two groups of drivers. They give the test to 400 drivers who have just finished driving 4 hours or less and they give the test to 585 drivers who have just finished driving 8 hours or more. The results of the tests are given below.

Passed Failed
Drove 4 hours or less 310 90
Drove 8 hours or more 415 170

Is there is a relationship between hours of driving and alertness? (Do a test for independence.) Test at the 1 % level of significance.

Solutions

Expert Solution


Related Solutions

A trucking company wants to find out if their drivers are still alert after driving long...
A trucking company wants to find out if their drivers are still alert after driving long hours. So, they give a test for alertness to two groups of drivers. They give the test to 395 drivers who have just finished driving 4 hours or less and they give the test to 565 drivers who have just finished driving 8 hours or more. The results of the tests are given below. Passed Failed Drove 4 hours or less 290 105 Drove...
A trucking company wants to find out if their drivers are still alert after driving long...
A trucking company wants to find out if their drivers are still alert after driving long hours. So, they give a test for alertness to two groups of drivers. They give the test to 400 drivers who have just finished driving 4 hours or less and they give the test to 585 drivers who have just finished driving 8 hours or more. The results of the tests are given below.                                                 Passed       Failed Drove 4 hours or less                 310   ...
The Teamsters Union is attempting to organize the drivers at We Haul trucking company. Workers who...
The Teamsters Union is attempting to organize the drivers at We Haul trucking company. Workers who favor a union have been using the lunchroom to hand out petitions and urge other drivers to sign authorization cards. The company posts a notice in the lunchroom: “Many employees do not want unions discussed in the lunchroom. Out of respect for them, we are prohibiting further union efforts in this lunchroom.” Is this sign legal? FedEx gave Marcie Dutschmann an employment handbook stating...
Billy is a 15 y/o with his new drivers permit out driving with mom. She screams...
Billy is a 15 y/o with his new drivers permit out driving with mom. She screams stop, but he runs through the red light and is T-boned by a large truck. There is significant intrusion into the driver’s side of the car. Extrication of Billy took 45 minutes. Upon arrival to the ER Billy is lethargic, opens his eyes briefly to voice and is able to follow simple commands with much prompting. When asked how he’s doing he occasionally mumbles...
An astronaut wants to find out his mass while in orbit, to find out if he...
An astronaut wants to find out his mass while in orbit, to find out if he is staying healthy while in space. Since he can't use a bathroom scale (why not?), he attaches himself to a spring (k=2500 N/m), pulls himself back from the spring's equil length by 5 m, and times one oscillation to take 1 s. a.) What is the mass of the astronaut? ________ kg b.) Find the potential energy stored in the spring when it is...
3. A company wants to find out if the average response time to a request differs...
3. A company wants to find out if the average response time to a request differs across its two servers. Say µ1 is the true mean/expectation response time on server 1 and µ2 the true mean/expectation response time on server 2. Independent samples across the two servers is taken. 196 observations on server 1 return a sample mean of X¯ = 12.5 seconds and a sample variance of s 2 = 9 seconds. 225 observations on server 2 return a...
The maintenance manager at a trucking company wants to build a regression model to forecast the...
The maintenance manager at a trucking company wants to build a regression model to forecast the time (in years) until the first engine overhaul based on four explanatory variables: (1) annual miles driven (in 1,000s of miles), (2) average load weight (in tons), (3) average driving speed (in mph), and (4) oil change interval (in 1,000s of miles). Based on driver logs and onboard computers, data have been obtained for a sample of 25 trucks. A portion of the data...
The maintenance manager at a trucking company wants to build a regression model to forecast the...
The maintenance manager at a trucking company wants to build a regression model to forecast the time (in years) until the first engine overhaul based on four explanatory variables: (1) annual miles driven (in 1,000s of miles), (2) average load weight (in tons), (3) average driving speed (in mph), and (4) oil change interval (in 1,000s of miles). Based on driver logs and onboard computers, data have been obtained for a sample of 25 trucks. A portion of the data...
The maintenance manager at a trucking company wants to build a regression model to forecast the...
The maintenance manager at a trucking company wants to build a regression model to forecast the time (in years) until the first engine overhaul based on four explanatory variables: (1) annual miles driven (in 1,000s of miles), (2) average load weight (in tons), (3) average driving speed (in mph), and (4) oil change interval (in 1,000s of miles). Based on driver logs and onboard computers, data have been obtained for a sample of 25 trucks. A portion of the data...
The maintenance manager at a trucking company wants to build a regression model to forecast the...
The maintenance manager at a trucking company wants to build a regression model to forecast the time (in years) until the first engine overhaul based on four explanatory variables: (1) annual miles driven (in 1,000s of miles), (2) average load weight (in tons), (3) average driving speed (in mph), and (4) oil change interval (in 1,000s of miles). Based on driver logs and onboard computers, data have been obtained for a sample of 25 trucks. A portion of the data...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT