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?
Based on the above research scenario, please answer the following questions:
I did step 1 but need step 2-4
Step 2:
Step 3:
Step 4: _______________________________
Write the statistical statement for your results: __________________________________
Interpret your results (relating back to the hypothesis): _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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:_____________
Research Scenario #1 A researcher hypothesizes that zylex, a new antidepressant, will affect concentration. It is...
Research Scenario #2: A researcher wanted to study the effect of alcohol on reaction time. She hypothesized that alcohol will INCREASE reaction time (participants will take longer to react). She selected a sample of n= 36 participants from Rutgers University. The 36 participants each consumed a 6-ounce glass of wine. Thirty minutes later, the researcher measured each participant’s reaction time, using a standardized driving simulation task for which the regular population has a µ = 400 msec reaction time with...
A sleep researcher hypothesizes that sleep is related to feelings of tiredness. Below are partial SPSS results with α = 0.01 of the analysis for a sample of participants at a sleep center. 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 solve the problem.) Critical value = ; Test statistic = Decision: ---Select--- Reject H0 Fail to reject H0 b) Compute the corresponding effect size(s)...
A sleep researcher hypothesizes that more sleep is related feeling less tired. Below are partial SPSS results with α = 0.01 of the analysis for a sample of participants at a sleep center. 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 solve the problem.) Critical value = ; Test statistic = Decision: ---Select--- Reject H0 Fail to reject H0 b) Compute the corresponding effect size(s)...
A researcher administers a treatment to a sample of participants selected from a population with µ = 62. If the sample mean after the treatment is M = 70, which value of standard error,σM will result in the rejection of null hypothesis (assume p < 0.05, 2-tails test)? A. σM = 4 B. σM = 8 C. σM = 10 D. σM = 6 Please explain each step in detail, thank you!
A sleep researcher hypothesizes that more sleep is related feeling less tired. Below are partial SPSS results with α = 0.10 of the analysis for a sample of participants at a sleep center. Sleep Tired Sleep Pearson Correlation Sig. (2-tailed) N 1 13 0.804 −−− 13 Tired Pearson Correlation Sig. (2-tailed) N 0.804 −−− 13 1 13 a) Compute the appropriate test statistic(s) to make a decision about H0. (Hint: Make sure to write down the null and alternative hypotheses...
PLEASE help ?? A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
give reason please 12. A research study uses a single sample of participants to evaluate the effect of a treatment. The results of the hypothesis test are reported as follows: (14)=2.73.p<.05." Based on this report, what was the statistical decision? (a) The null hypothesis was rejected and the probability of a Type I error is less than .05. b. The null hypothesis was not rejected and the probability of a Type I error is less than .05. e. The null...
A sleep researcher hypothesizes that sleep is related to feelings of tiredness. Below are partial SPSSresults with an α of 0.05 of the analysis for a sample of participants at a sleep center.SleepTiredSleepPearson Correlation Sig. (2-tailed) N1 130.804 −−− 13TiredPearson Correlation Sig. (2-tailed) N0.804 −−− 131 13a) 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 solve the problem.)Critical value = ; Test statistic = Decision: ---Select--- Reject H0 Fail to reject H0 b) Compute the corresponding effect size(s) and indicate magnitude(s).If not appropriate, input and/or select "na"...
, A researcher hypothesizes that arousal levels will be affected by meditation. The sample participates in formal meditation classes for 3 weeks, before and after which arousal is measured. Subject BEFORE MEDITATION AFTER MEDITATION 1 72 91 2 162 155 3 145 152 4 183 190 5 123 134 6 167 157 7 76 99 8 112 104 9 124 143 10 137 156 l. What is the researcher’s hypothesis? ________________________________________________________________________ 2. What is the null hypothesis? ________________________________________________________________________ 3. What...
1. Which of the following demonstrates a Type I Error? A. A researcher obtains a significant result and rejects the null hypothesis when the result is actually due to random chance and sampling error. B. A researcher obtains a significant result and fails to reject the null hypothesis when the result is actually due to random chance and sampling error. C. A researcher obtains a nonsignificant result and rejects the null hypothesis when the result is actually due to a...