Question

In: Statistics and Probability

In a study of smoking and its effects on sleep patterns, one variable is the time...

In a study of smoking and its effects on sleep patterns, one variable is the time that it takes to fall asleep. A random sample of size 12 is drawn from the population of smokers; an independent sample of size 15 is drawn from the population of non-smokers. The mean time to sleep for smokers is 43.70 minutes; for non-smokers it is 30.32 minutes. The sample variance for the time to sleep for smokers is 286.549 min2  while for non-smokers it is 50.806 min2 .

Find a 95% confidence interval to determine if these data indicate that smokers tend to take longer to fall asleep than non-smokers. (Hint: Degrees of freedom formula yields df = 14.2)

Solutions

Expert Solution

Dear student,
I am waiting for your feedback. I have given my 100% to solve your queries. If you satisfied with my answer then please please like this.
Thank You


Related Solutions

A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 was water (control). Treatment 2 was 1g of ethanol per kg of body weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in minutes) in a 24hr period was recorded: Treatment 1 63 54 69 50 72 Treatment 2 45 60 40 56 Treatment 3 31 40 45 25 23 28 Are these data strong evidence REM...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 was water (control). Treatment 2 was 1g of ethanol per kg of body weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in minutes) in a 24hr period was recorded: Treatment 1: 63, 54, 69, 50, 72 Treatment 2: 45, 60, 40, 56 Treatment 3: 31, 40, 45, 25, 23, 28 Are these data strong evidence REM...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 was water (control). Treatment 2 was 1g of ethanol per kg of body weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in minutes) in a 24hr period was recorded: Treatment 1: 63, 54, 69, 50, 72 Treatment 2: 45, 60, 40, 56 Treatment 3: 31, 40, 45, 25, 23, 28 Are these data strong evidence REM...
How has the study of trade patterns evolved over time, and in the light of empirical...
How has the study of trade patterns evolved over time, and in the light of empirical testing of trade models
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were...
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 got only water (control). Treatment 2 got 1g of ethanol per kg of body weight, and treatment 3 got 2g/kg of ethanol. The amount of REM sleep in a 24hr period was recorded, in minutes. Data are below: Treatment 1: 63, 54, 69, 50, 72 Treatment 2: 45, 60, 40, 56 Treatment 3: 31, 40, 45,...
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were...
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 got only water (control). Treatment 2 got 1g of ethanol per kg of body weight, and treatment 3 got 2g ethanol per kg of body weight. The amount of REM sleep in a 24hr period was recorded, in minutes. Data are below: Treatment 1: 63, 54, 69, 50, 72 Treatment 2: 45, 60, 40, 56 Treatment...
A survey was conducted to study if parental smoking is associated with the incidence of smoking...
A survey was conducted to study if parental smoking is associated with the incidence of smoking in children when they reach high school. Randomly chosen high school students were asked whether they smoked and whether at least one of their parents smoked. The results are summarized in the following table: Student Smoke Student Don’t Parents Smoke 262 183 Parents Don’t 120 380 (a) For a randomly selected student in this study, find the conditional probability of smoking given his/her parents...
A. Suppose you want to study the number of hours of sleep full-time undergraduate students at...
A. Suppose you want to study the number of hours of sleep full-time undergraduate students at Belmont get each evening. To do so, you obtain a list of full-time undergraduate students at Belmont, obtain a simple random sample of ten students, and ask each of them to disclose how many hours of sleep they obtained the most recent Monday. What is the population of interest in this study? What is the sample? Explain why number of hours of sleep in...
why is time management an important variable with a system of study?
why is time management an important variable with a system of study?
A researcher at the college used a random sample of 30 students to investigate sleep patterns...
A researcher at the college used a random sample of 30 students to investigate sleep patterns of two groups. The output below was constructed from this study for comparing average sleep hours of students who have early classes versus students who do not have early classes. The hours of sleep for both group of students are stored in EarlyClass.xlsx. Download and open this file into Excel. Use Excel to undertake a suitable test to address the research question below. NoEarlyClass...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT