Question

Research Scenario #1 A researcher hypothesizes that zylex, a new antidepressant, will affect concentration. It is...

Research Scenario #1

A researcher hypothesizes that zylex, a new antidepressant, will affect concentration. It is known that scores on a standardized concentration test is normally distributed with a µ= 50 and a σ= 12. A random sample of n=16 participants, aged 19-35, are chosen from the State of New Jersey. The sample is put on a six month dosage plan of zylex. After six months, all the participants are given a standardized concentration test. The researcher records the data and calculates a sample mean of M=56. Are the data sufficient to conclude that the drug, zylex, does have an effect on concentration?

  1. What is the appropriate hypothesis test? __________________

  1. What two means are you comparing in this test? _____________________________

  1. Please calculate the appropriate hypothesis test using all four steps:

Step 1:

Step 2:

Step 3:

Step 4: _______________________________

Write the statistical statement for your results: __________________________________

Interpret your results (relating back to the hypothesis): _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Is there a probability of Type I error? Yes ______ No ______

If yes, what is the probability of a Type I error? ________

Is yes, how could you have decreased that probability? __________________________________

Is there a probability of Type II error? Yes_____ No______

If it is appropriate, please calculate effect size:   Answer:_____________

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A researcher hypothesizes that electrical stimulation of a region of the ventromedial hypothalamus will result in...
A researcher hypothesizes that electrical stimulation of a region of the ventromedial hypothalamus will result in appetite suppression. To test this, one set of rats is given electrical stimulation, while a control group does not. Rats are subsequently given unrestricted access to sugar pellets for 5 minutes, and the number of pellets eaten is recorded. a. Use the appropriate test of hypothesis to determine whether or not the treatment rats consume fewer pellets. Use α = .05 No Stimulation: 12,...
A researcher hypothesizes that caffeine will affect the speed with which people read. To test this,...
A researcher hypothesizes that caffeine will affect the speed with which people read. To test this, the researcher randomly assigns 8 people into one of two groups: 50mg Caffeine (n1=4) or no Caffeine (n2=4). An hour after the treatment, the 8 participants in the study are asked to read from a book for 1 minute; the researcher counts the number of words each participant finished reading. The following are the data for each group: 50mg Caffeine (group 1) 450 400...
A sleep researcher hypothesizes that sleep is related to feelings of tiredness. Below are partial SPSS...
A sleep researcher hypothesizes that sleep is related to feelings of tiredness. Below are partial SPSS results with α = 0.05 of the analysis for a sample of participants at a sleep center. sleep tired sleep Pearson Correlation Sig. (2-tailed) N 1 17 0.358 17 tired Pearson Correlation Sig. (2-tailed) N 0.358 17 1 17 a) Compute the appropriate test statistic(s) to make a decision about H0. (Hint: Make sure to write down the null and alternative hypotheses to help...
A researcher knows that scores on a standardized language measure are normally distributed with a μ...
A researcher knows that scores on a standardized language measure are normally distributed with a μ = 50 and σ = 20. She wants to know if an online computer program will improve scores on the standardized test. She gives a sample of n = 25 students the study program and calculates the sample mean (M = 60) for her group of students that received the study program. She calculates her test statistic to be z = 2.5 ! She...
research hypothesis stating the treatment effect in contrast to the statement of null effect alternative hypothesis...
research hypothesis stating the treatment effect in contrast to the statement of null effect alternative hypothesis central limit theorem sampling bias two-tailed test upper probability value allowed for rejecting the null hypothesis significance level parameter type 1 error two-tailed test drawing conclusions about a population from sample data empirical data inferential statistics discrete distribution random sampling Assume that a new treatment for helping alcoholics isn't any better than an old treatment. A researcher, who doesn't know this, designs a study...
A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory...
A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory performance.  A sample of n = 25 college students is obtained and each student takes the supplement daily for six week.  At the end of the 6-week period, each student is given a standardized memory test and the average score for the sample is M = 39.  For the general population of college students, the distribution of test scores is normal with a mean of µ =...
A researcher conducts a single-sample t test and finds statistical significance at the 0.01 level. The...
A researcher conducts a single-sample t test and finds statistical significance at the 0.01 level. The effect size is then calculated and found to be 0.50. What might you conclude about the findings? A. These findings are exciting because statistical significance was found with a very small effect, indicating that the results are real and the chance of a Type I error are low. B. While the results of the test are statistically significant, the effect size indicates that they...
A researcher wants to support the claim that students spend less than 7 hours per week...
A researcher wants to support the claim that students spend less than 7 hours per week doing homework. The sample size for the test is 64 students. The drawing shown diagrams a hypothesis test for population mean under the Null Hypothesis (top drawing) and under the Alternative Hypothesis (bottom drawing). State the Null and Alternative Hypotheses. What is the design probability associated with Type I error? What is the design probability associated with Type II error? What is the power...
A medical researcher would like to determine how effective a new form of knee surgery is...
A medical researcher would like to determine how effective a new form of knee surgery is for treating knee pains. (In particular, is there a relationship between surgery status and pain reduction status?) He gathers 500 people with knee pain who are scheduled to have this surgery, and 500 people with knee pain who are not scheduled to have this surgery. He follows up with both groups after 2 months and determines the number of participants of each group who...
2. In a study examining the effect of caffeine on reaction time, Liguori and Robinson (2001)...
2. In a study examining the effect of caffeine on reaction time, Liguori and Robinson (2001) measured reaction time 30 minutes after participants consumed one 6-ounce cup of coffee and they used standardized driving simulation task for which the regular population averages μ = 415 msec. The distribution of reaction times is approximately normal with σ = 40. Assume that the researcher obtained a sample mean of M = 400 msec for the n = 36 participants in the study....
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT