Question

In: Statistics and Probability

. A psychologist is interested in determining whether immediate memory capacity is affected by sleep loss....

. A psychologist is interested in determining whether immediate memory capacity is affected by sleep loss. Immediate memory is defined as the amount of material that can be remembered immediately after it has been presented. Twelve students are randomly selected from lower division college courses and randomly assigned to two groups of 6 each. One of the groups is sleep deprived for 24 hours before the material is presented. All subjects in the other group receive the normal amount of sleep (7-8 hours). The material consists of a series of slides, with each slide containing nine numbers. Each slide is presented for a short time interval (50 milliseconds), after which the subject must recall as many numbers as possible. On the following page are the results. The scores represent the percentage correctly recalled.

Normal Sleep Group: 68 73 72 65 70 73

Sleep Deprived Group: 70 62 68 63 69 60

a. Describe (1) the independent variable and its levels, and (2) the dependent variable and its scale of measurement.

b. Describe the null and alternative hypotheses for the study described.

c. Using Excel, conduct a statistical test of the null hypothesis at p = .05. Be sure to properly state your statistical conclusion.

d. Provide an interpretation of your statistical conclusion in part C.

e. What type of statistical error might you have made in part C?

f. Obtain the 95% confidence interval using the obtained statistic.

g. Provide an interpretation of the confidence interval obtained in part f.

h. Does the confidence interval obtained support your statistical conclusion? Explain your answer

Solutions

Expert Solution

orchestra answered 1 year ago
Next > < Previous

Related Solutions

7. A psychologist is interested in determining whether immediate memory capacity is affected by sleep loss....
7. A psychologist is interested in determining whether immediate memory capacity is affected by sleep loss. Immediate memory is defined as the amount of material that can be remembered immediately after it has been presented. Twelve students are randomly selected from lower division college courses and randomly assigned to two groups of 6 each. One of the groups is sleep deprived for 24 hours before the material is presented. All subjects in the other group receive the normal amount of...
A psychologist is interested in the effect that no sleep has on individuals’ abilities to perform...
A psychologist is interested in the effect that no sleep has on individuals’ abilities to perform motor tasks (physical abilities). She recruits a sample of n = 25 college students to serve as the control group, which is allowed to sleep up to 10 hours. A second sample of n = 25 college students is selected and stays up all night. The following morning, the students attempt to make 20 free throw shots with a basketball, the number of shots...
Lacey is interested in determining whether people who have experienced a traumatic event experience more sleep...
Lacey is interested in determining whether people who have experienced a traumatic event experience more sleep disturbances than people who have not experienced such an event. She distributes a sleep disturbance survey to 103 individuals wh o experienced a traumatic event and to 98 people who had never experienced a traumatic event. If the mean score on the survey was 13.20 ( s = 3.51) for the trauma group and 8.10 ( s = 2.17 ) for the non-trauma group,...
Q4. Researchers were interested in determining whether gender and/or the number of tours soldiers served affected...
Q4. Researchers were interested in determining whether gender and/or the number of tours soldiers served affected the incidence of PTSD. The PTSD impact instrument was used and scores were recorded upon discharge. State the null and alternate hypotheses. Include both interaction and main effect hypotheses (should be 3 null and 3 alternate hypotheses). What is the total sample size? Identify the independent and dependent variables List the test statistic and p value for the all your hypotheses? (Hint, there should...
We are interested in determining whether husbands differ from their wives on weight loss after taking...
We are interested in determining whether husbands differ from their wives on weight loss after taking a weight loss supplement. To evaluate this, we need to conduct a(n): A. Independent samples t-test (*this was incorrect*) B. Dependent samples t-test C. One sample t-test D. Any of these would be appropriate My next best guess would be a one sample t-test but I am not sure anymore
A psychologist was particularly interested in the relationship between hypnosis on memory. To test this she...
A psychologist was particularly interested in the relationship between hypnosis on memory. To test this she exposed 10 subjects to a list of 40 nonsense words. She then hypnotized each subject and asked them to recall as many words from the list as was possible. The mean of these responses is 22 and the standard deviation is 5.9. LV remembered 0 words. What is their z score? SI remembered 21 words. What is their T score? What proportion of subjects...
A psychologist is interested in testing whether there is a difference in the distribution of personality...
A psychologist is interested in testing whether there is a difference in the distribution of personality types for business majors and social science majors. The results of the study are shown in the table below. Conduct a test of homogeneity. Test at a 5% level of significance. Open Conscientious Extrovert Agreeable Neurotic Business 40 52 48 63 56 Social Science 71 74 61 80 63 What is the test statistic? (Round your answer to two decimal places.) Part (f) What...
the leaders of the study are interested in the determining whether there is a difference in...
the leaders of the study are interested in the determining whether there is a difference in mean annual contributions for individuals covered by TSA's and those with 401(k) retirements program. you can use the results form the following table to test if the population mean of individual covered by TSAs is higher than those covered by 401(k). TSA    401(K) n1 = 8    n2=10 x1= 322.5 x2=298.3 s1=48.3 s2= 53.3 1. Formulate the appropriate null and alternative hypotheses 2....
A chemist in interested in determining the weight loss of a particular compound as a function...
A chemist in interested in determining the weight loss of a particular compound as a function of the amount of time the compound is exposed to the air. The data below give the weight losses associated with settings of the exposure time.                   Weight Loss (in pounds)           Exposure Time (in hours)         ____________________________________________________                           4.0                                                  4                            6.0                                                  5                                 2.0                                             3                            .                                                    .                                  .                                                        .                            9.0                         ...
A chemist in interested in determining the weight loss of a particular compound as a function...
A chemist in interested in determining the weight loss of a particular compound as a function of the amount of time the compound is exposed to the air. The data below give the weight losses associated with settings of the exposure time.                   Weight Loss (in pounds)           Exposure Time (in hours)         ____________________________________________________                           4.0                                                  4                            6.0                                                  5                                 2.0                                             3                            .                                                    .                                  .                                                        .                            9.0                         ...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT