A researcher wants to test the hypothesis that alcohol reduces ...

[Themember4]

A researcher wants to test the hypothesis that alcohol reduces driver's reaction time. On a closed driving course, the researcher studies 50 drivers with alcohol in their system and 50 drivers with no alcohol in their system, while measuring reaction time in milliseconds. The average reaction time for drivers with alcohol in their system was 142 milliseconds with a standard deviation of 7.45. The average reaction time with no alcohol in their system was 134 milliseconds with a standard deviation of 6.81.

What is the research hypothesis?

[zhanghao]

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[SGallaher96]

A researcher wants to test the hypothesis that alcohol reduces driver's reaction time. On a closed driving course, the researcher studies 50 drivers with alcohol in their system and 50 drivers with no alcohol in their system, while measuring reaction time in milliseconds. The average reaction time for drivers with alcohol in their system was 142 milliseconds with a standard deviation of 7.45. The average reaction time with no alcohol in their system was 134 milliseconds with a standard deviation of 6.81.

What is the null hypothesis? (pay attention to the scenario)

[katheyjon]

Having alcohol in their system will not cause drivers to have a slower reaction time
than those with no alcohol in their system. Or µ drivers with alcohol in their system
? µ drivers with no alcohol in their system

[ETearle]

A researcher wants to test the hypothesis that alcohol reduces driver's reaction time. On a closed driving course, the researcher studies 50 drivers with alcohol in their system and 50 drivers with no alcohol in their system, while measuring reaction time in milliseconds. The average reaction time for drivers with alcohol in
their system was 142 milliseconds with a standard deviation of 7.45. The average reaction time with no alcohol in their system was 134 milliseconds with a standard deviation of 6.81.

Calculate t

[akpaschal]

t = 5.548

[roselinechinyere27m]

A researcher wants to test the hypothesis that alcohol reduces driver's reaction time. On a closed driving course, the researcher studies 50 drivers with alcohol in their system and 50 drivers with no alcohol in their system, while measuring reaction time in milliseconds. The average reaction time for drivers with alcohol in
their system was 142 milliseconds with a standard deviation of 7.45. The average reaction time with no alcohol in their system was 134 milliseconds with a standard deviation of 6.81.

What are your degrees of freedom?

[Jadwiga9]

[faduma]

A researcher wants to test the hypothesis that alcohol reduces driver's reaction
time.  On a closed driving course, the researcher studies 50 drivers with alcohol in
their system and 50 drivers with no alcohol in their system, while measuring
reaction time in milliseconds.  The average reaction time for drivers with alcohol in
their system was 142 milliseconds with a standard deviation of 7.45. The average
reaction time with no alcohol in their system was 134 milliseconds with a standard
deviation of 6.81.

Are your results significant, and if so, at what level?

[shewald78]

Yes, at the .0005 level. (5.548 > 3.460, the intersection of 60 df and .0005 in Table
C)