Question

A researcher would like to determine whether an over-the-counter cold medication has an effect on mental...

A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with a μ = 60 a n d σ = 8 . The individuals in the sample had an average score of M = 56.5.

a. Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Use a two-tailed test with an α = .05 .

b. Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Use a one-tailed test with α = .05 .

c. Compute Cohen's d to measure the size of the effect.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental...
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with μ = 60 and σ = 8. The average score in the sample was M = 63. Can the researcher...
  A researcher would like to determine whether an over-the-counter cold medication has an effect on mental...
  A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness.  A sample of n = 16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task.  For the general population, reaction time scores on the simulation task are normally distributed with μ = 210 and σ = 20.  The individuals in the sample had an average score of M = 222.             a....
A researcher would like to determine whether caffeine has an effect on mental alertness after sleep...
A researcher would like to determine whether caffeine has an effect on mental alertness after sleep deprivation. A sample of n = 25 participants is obtained, and each person is given a cup of coffee, after one night of total sleep deprivation, one hour before being tested in a driving simulation task. For the general population with one night of losing sleep, scores on the simulation task are normally distributed with μ = 66. The individuals in the sample had...
Identify the appropriate statistical test for each research description: Single-sample z-test Single-samplet-test Independent samples t-test Related...
Identify the appropriate statistical test for each research description: Single-sample z-test Single-samplet-test Independent samples t-test Related samples t-test (repeated measures or matched samples) Correlation A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task...
A researcher wants to examine the effect of new allergy medication on mental alertness. A sample...
A researcher wants to examine the effect of new allergy medication on mental alertness. A sample of n = 16 college students is selected to the study. Each participant is given a normal dose of the medicine and thirty minutes later, each student's alertness is measured on a video game that requires careful attention and quick decision making. The results show that the sample mean alertness score is M = 39 with the standard deviation s = 18. Assuming that...
A researcher would like to evaluate the effect of a new cold medication on reaction time....
A researcher would like to evaluate the effect of a new cold medication on reaction time. It is known that under regular circumstances the distribution of reaction times is normal with µ = 200. A sample of n = 9 participants is obtained. Each person is given the new cold medication, and 1 hour later reaction time is measured for each individual. The average reaction time for this sample is M = 206 with SS = 648. The researcher would...
A researcher asks whether a cold medication interferes with cognition. A standardized test containing a variety...
A researcher asks whether a cold medication interferes with cognition. A standardized test containing a variety of problem-solving tasks is normally distributed with μ = 64. A random sample of n = 25 subjects is given the drug and then tested (M = 57, SD=9). Does the data show that the medication decreases performance in a one-tail, one-sample t test (α’ =.05)?
In a study examining the effect of caffeine on response time in the driving simulator, researchers...
In a study examining the effect of caffeine on response time in the driving simulator, researchers measured reaction time 30 minutes after participants consumed one 6-ouncee cup of coffee. Using a driving simulation task, for which the distribution of reaction time is normal with m=400 and s=40, they obtained a mean of M=392 for a sample of n=36 participants. a. Are the data sufficient to conclude that caffeine has a significant effect on reaction time? Use a two-tailed test with...
A researcher investigates whether a new medication produces enough sedation to impair mental functioning. It is...
A researcher investigates whether a new medication produces enough sedation to impair mental functioning. It is known that scores on a standardized test containing a variety of problem -solving tasks are normally distributed with μ = 64 and σ= 8. Higher scores on the tasks are associated with higher levels of mental functioning. A random sample of n = 12 subjects is given the drug and then tested. For this sample, the mean is M = 58. Does the drug...
A researcher wants to determine whether or not a given drug has any effect on the...
A researcher wants to determine whether or not a given drug has any effect on the scores of human subjects performing a task of psychomotor coordination. The 9 subjects in Group A (Experimental Group) received an oral administration of the drug prior to being tested. Ten subjects in Group B (Control Group) received a placebo at the same time. The results of the experiment are shown below: Group A Group B 12 21 14 18 10 14 8 20 16...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT