Question

In: Statistics and Probability

A sleep disorder specialist wants to test the effectiveness of a new drug that is reported...

A sleep disorder specialist wants to test the effectiveness of a new drug that is reported to increase the number of hours of sleep patients get during the night. To do so, the specialist randomly selects nine patients and records the number of hours of sleep each gets with and without the new drug. The results of the two-night study are listed below. Using this data, find the 99% confidence interval for the true difference in hours of sleep between the patients using and not using the new drug. Assume that the hours of sleep are normally distributed for the population of patients both before and after taking the new drug.

Patient 1 2 3 4 5 6 7 8 9
Hours of sleep without 4.4 6.6 5.7 2 5.1 3.1 6.1 2.8 6.8
Hours of sleep with 7.3 8.3 8.4 3.7 6.6 5.3 6.8 5.2 7.8

Step 1 of 4: Find the point estimate for the population mean of the paired differences. Let x1 be the number of hours of sleep without the new drug and x2 be the number of hours of sleep with the new drug and use the formula d=x2−x1 to calculate the paired differences. Round your answer to two decimal places.

Step 2 of 4: Calculate the sample standard deviation of the paired differences. Round your answer to six decimal places.

Step 3 of 4: Calculate the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.

Step 4 of 4: Construct the 99% confidence interval. Round your answers to two decimal places.

Solutions

Expert Solution

Number Hours of sleep with Hours of sleep without Difference
7.3 4.4 2.9 1.06777778
8.3 6.6 1.7 0.02777778
8.4 5.7 2.7 0.69444444
3.7 2 1.7 0.02777778
6.6 5.1 1.5 0.13444444
5.3 3.1 2.2 0.11111111
6.8 6.1 0.7 1.36111111
5.2 2.8 2.4 0.28444444
7.8 6.8 1 0.75111111
Total 59.4 42.6 16.8 4.46

part a)

Point estimate = 1.87

Part b)



Margin of Error =

Confidence Interval :-



Lower Limit =
Lower Limit = 1.0312
Upper Limit =
Upper Limit = 2.7022
99% Confidence interval is ( 1.03 , 2.70 )


Related Solutions

A sleep disorder specialist wants to test the effectiveness of a new drug that is reported...
A sleep disorder specialist wants to test the effectiveness of a new drug that is reported to increase the number of hours of sleep patients get during the night. To do so, the specialist randomly selects nine patients and records the number of hours of sleep each gets with and without the new drug. The results of the two-night study are listed below. Using this data, find the 99% confidence interval for the true difference in hours of sleep between...
A sleep disorder specialist wants to test the effectiveness of a new drug that is reported...
A sleep disorder specialist wants to test the effectiveness of a new drug that is reported to increase the number of hours of sleep patients get during the night. To do so, the specialist randomly selects nine patients and records the number of hours of sleep each gets with and without the new drug. The results of the two-night study are listed below. Using this data, find the 90% confidence interval for the true difference in hours of sleep between...
To test the effectiveness of a new drug, a researcher gives one group of individuals the...
To test the effectiveness of a new drug, a researcher gives one group of individuals the new drug and another group a placebo. The results of the study are shown here. At α = 0.10, can the researcher conclude that the drug is effective? Use the P value method. Medication                              Effective                                          Not Effective                                                 Obs.,       Exp                                        Obs.,       Esp Drug                                        32                                                      9 Placebo                                   12                                                      18
11. The Scheffe test Sleep apnea is a sleep disorder characterized by pauses in breathing during...
11. The Scheffe test Sleep apnea is a sleep disorder characterized by pauses in breathing during sleep. Children with sleep apnea have behavior problems, including hyperactivity, inattention, and aggression, as well as impaired learning and diminished academic performance. The removal of tonsils and adenoids that are enlarged, causing the obstruction of the airways, is one of the most common treatments for pediatric sleep apnea. A clinical psychologist studies the effects of tonsillectomy and adenoidectomy on aggressive behavior. Her quasi-experiment includes...
7. You plan to conduct an experiment to test the effectiveness of Sleepze, a new drug...
7. You plan to conduct an experiment to test the effectiveness of Sleepze, a new drug that is supposed to reduce insomnia. You have a sample of 100 subjects. a. Why is it important to include a placebo in this experimental design? b. Describe how you can make this a completely randomized experiment. c. What is “blinding” and how might it be used in this experiment? d. Why is it important to use blinding in this experiment?
To test the effectiveness of a new drug, a researcher gives one group of randomly selected...
To test the effectiveness of a new drug, a researcher gives one group of randomly selected individuals the new drug and another group of randomly selected individuals a placebo. The results are shown in the table below. Drug 32 (effective) 9 (ineffective) Placebo 12 (effective) 18 (ineffective) At 0.05, can the researcher conclude that the drug results differ from those of the placebo? (Show ALL steps including conditions).
To test the effectiveness of a new drug (Phasomaxtrin) designed to treat Quarantinitis, researchers conducted a...
To test the effectiveness of a new drug (Phasomaxtrin) designed to treat Quarantinitis, researchers conducted a clinical trial. The subjects were 512 adult American volunteers with advanced Quarantinitis. Half were randomly assigned to take the drug and the other half were randomly assigned to take a placebo. Neither the subjects nor the doctors who evaluated them knew who was in which group. After three years, 32 percent of those who got Phasomaxtrin were no longer afraid to keep staying inside,...
Mary, a colleague of yours, wants to test the effectiveness of a new lesson plan on...
Mary, a colleague of yours, wants to test the effectiveness of a new lesson plan on two different groups of students. She wants to perform a t-test, but she is not sure whether to use a paired or unpaired test. Base on the information provided, how would you advise your colleague? If she asked you to perform the calculation for her, how would you use SPSS to do so? Class, for this DQ, create a hypothetical dataset in SPSS that...
Mary, a colleague of yours, wants to test the effectiveness of a new lesson plan on...
Mary, a colleague of yours, wants to test the effectiveness of a new lesson plan on two different groups of students. She wants to perform a t-test, but she is not sure whether to use a paired or unpaired test. Base on the information provided, how would you advise your colleague? If she asked you to perform the calculation for her, how would you use SPSS to do so? Create data in SPSS and run it as an example. I...
An investigator wants to test the effectiveness of a new weight loss medication at reducing BMI...
An investigator wants to test the effectiveness of a new weight loss medication at reducing BMI (kg/m2). Suppose the following table represents the results from a SRS of individuals enrolled in the study. Assume a normal approximation is acceptable. (α=.05)(6 points) Patient BMI Pre-Test (kg/m2) BMI Post-Test (kg/m2) A 30.5 26.5 B 32.8 28.5 C 35.6 28.4 D 34.7 25.7 E 33.9 29.4 A) What type of test design is this? B) Write our your null and alternative hypotheses. H0:µd=____  ,Ha:...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT