A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment, 21 subjects had a mean wake time of 100.0 min. After​ treatment, the 21 subjects had a mean wake time of 96.9 min and a standard deviation of 20.3 min. Assume that the 21 sample values appear to be from a normally distributed population and construct a 90​% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 100.0 min before the​ treatment? Does the drug appear to be​ effective? Construct the 90​% confidence interval estimate of the mean wake time for a population with the treatment.   ?? min< µ < ?? min

Question
A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment, 21 subjects had a mean wake time of 100.0 min. After​ treatment, the 21 subjects had a mean wake time of
96.9 min and a standard deviation of 20.3 min. Assume that the
21 sample values appear to be from a normally distributed population and construct a 90​% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 100.0 min before the​ treatment? Does the drug appear to be​ effective? Construct the 90​% confidence interval estimate of the mean wake time for a population with the treatment.
 
?? min< µ < ?? min

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Math
Statistics

Hypothesis Testing

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: STATE: Andrew plans to retire in 4040 years. He plans to invest part of his retirement funds in stoc...

A: Given information- Population mean, μ = 11.0% Population standard deviation, σ = 17.0% Sample size, ...

Q: Applying the Concepts and SkillsIn Exercises, use the technology of your choice to perform and inter...

A: Click to see the answer

Q: Construct the indicated confidence interval for the difference between the two population means. Ass...

A: We have given the amount of time spent watching television by women and by men- For sample 1 for wom...

Q: A value of r close to ______ indicates that there is either no linear relationship between the varia...

A: Click to see the answer

Q: . Suppose 2 doctors A and B test all patients coming into a clinic for Syphilis. Let A+ = {doctor A ...

A: The proportion of patients diagnosed positive by doctor A = 0.10 The proportion of patients diagnose...

Q: if an estimated regression line has a y-intercept of 10 and a slope of -4, then when x=2, what is th...

A: It is given that,  An estimated regression line has y-intercept ,a= 10 Slope,b=-4 Thus,The estimated...

Q: About 35% of Americans will admit that they waste time regularly at work. A poll of 100 Americans is...

A: The provided information are: Population proportion (p) = 35% = 0.35 Number of Americans that are in...

Q: need help

A: Click to see the answer

Q: In clinical Stude, the event A represent a of Symptoms, and Ei's mutually Specific Symptom or a set ...

A: Introduction: Suppose X and Y are two events defined on the same sample space. Then, the conditional...

Q: 11. Home Ownership In a recent year , the rate of U.S. home ownership was 65.9 % . Choose a random s...

A: Obtain the probability that 65 to 85 ( inclusive ) of them live in homes that they own. The probabil...

Q: Of the quantities p1, p2, x1, x2, p1, p2, and pp, a. which represent parameters and which represent ...

A: a. The quantities provided are p1, p2, x1, x2, pˆ1, pˆ2 and pˆp. Parameter: The statistical measure ...

Q: Test the indicated claim about the variances or standard deviations of two populations. Assume that ...

A: Given information- We have given two samples. First sample is for customers enter any one of several...

Q: b0 = −6, b1 = 5, b2 = 0 a. determine whether the plane slopes upward, slopes downward, or is horizon...

A: Click to see the answer

Q: b0 = 6, b1 = –2, b2 = –1 a. determine whether the plane slopes upward, slopes downward, or is horizo...

A: Click to see the answer

Q: Consider the data set. 2,   3,   5,   6,   8 (b)  Use the defining formula to compute the sampl...

A: Click to see the answer

Q: The general social survey asked how many emails do you send in a day? The results of 928 respondents...

A: It is given that the number of residents is 928, the number of emails sent in a day is 10.4 and the ...

Q: help

A: Click to see the answer

Q: In a certain town, the number of internet glitches per day is a normal distribution with a mean of 2...

A: Given information- Population mean, μ = 20 Population standard deviation, σ = 4 Since the number of ...

Q: Movie attendance: Use the followong relative frequency distribution to estimate the percent of the m...

A: The given table is:  

Q: We have given the number of successes and the sample size for a simple random sample from a populati...

A: Given:

Q: Bank Breakup. In a nationwide survey, conducted by Pulse Opinion Research, LLC for Rasmussen Reports...

A: Click to see the answer

Q: Using the following data, what is the probability you'd select an individual whose IQ is greater tha...

A: Given information- We have given raw data of IQ of 24 individuals. Sample size, n = 24 Mean = 100.5 ...

Q: Testing Normality For the hypothesis test described in Exercise 2, the sample sizes are n1 = 147 and...

A: The sample size for first sample is n1=147and the sample size for second sample is n2=153. Requireme...

Q: In a recent year, the rate of U.S. home ownership was 65.9%. Choose a random sample of 120 household...

A: From the given information, it can be observed that the sample size is 120 and probability of U.S. o...

Q: In a certain year, 87% of all Caucasians in the U.S., 75% of all African-Americans, 75% of all Hispa...

A: Click to see the answer

Q: Fill in the blanks: Roughly, when arranged in increasing order, the middle 50% of a data set are fou...

A: Quartile1, Quartile2 and Quartile3 is define as “below quartile 1 25% of a data set are lie, below q...

Q: Suppose the Mean and Standard Deviation of a data set are 48 and 4 respectively. What is the Z value...

A: Click to see the answer

Q: Finding and Interpreting Percentiles In Exercises 37–40, use the data set, which represents wait tim...

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If y...

Q: A quantitative data set has mean 25 and standard deviation 5. Fill in the following blanks: a. At le...

A: It is given that the data set has a mean of 25 and a standard deviation is 5.

Q: need help

A: In this case it is needed to know whether the whether the birth occurs with equal frequency of the d...

Q: The amount of milk drunk in the US since has decreased approximately linearly since 1975 (see the in...

A: (a). Regression equation to predict repair time given the repair type: The data represents the value...

Q: Applying the Concepts and SkillsIn Exercises, use the technology of your choice toa. conduct a Krusk...

A: Click to see the answer

Q: Basis for the Range Rule of Thumb and the Empirical Rule. In Exercise, find the indicated area under...

A: Click to see the answer

Q: Early-Onset Dementia. Dementia is the loss of the intellectual and social abilities severe enough to...

A: Click to see the answer

Q: ​Claim: Most adults would erase all of their personal information online if they could. A software f...

A: State the hypotheses. That is, there is no evidence that the most of the adults would erase all of ...

Q: Convert 500 slug/in. to kg/m.

A: One slug per inch is equal to 574.563 kilogram per meter.

Q: Use the excel info and test the following claim. Use 2 decimal places for the data 1. Overbar x=    ...

A: Click to see the answer

Q: Figure/s of the control chart\s ?

A: The following table shows the calculation of the figures for the control chart:

Q: Gasoline Mileage. An engineer wants to determine factors that affect the EPA miles per gallon rating...

A: Click to see the answer

Q: Explain the difference between a. frequency and relative frequency. b. percentage and relative frequ...

A: Click to see the answer

Q: Define Multiple Regression Model? what is the population regression line or population regression fu...

A: Multiple regression model is the statistical technique to fins the relation between the dependent an...

Q: Estimating Median Income. Explain why a sample of 30 dentists from Seattle taken to estimate the med...

A: Given that, Estimating Median Income. Explain why a sample of 30 dentists from Seattle taken to esti...

Q: What is the range of the numbers -3,2,-5,3,11?

A: Click to see the answer

Q: Worker Fatigue. A study by M. Chen et al. titled “Heat Stress Evaluation andWorker Fatigue in a Stee...

A: Click to see the answer

Q: The following table shows the results of a survey of 200 authors by a publishing company. New Author...

A: In this case, the number of established authors are successful is 46 and the total number of authors...

Q: With the following data: 0.7, 0.9, 1.3, 1.1, 1.9, 2.4, 1.5, 2.3, 2.6, 2.9, 2.4, 2.7, 3.2, 3.5, 3.8; ...

A: The data set is:

Q: Dirt Bikes. Dirt bikes are simpler and lighter motorcycles that are designed for off-road events. Sp...

A: Click to see the answer

Q: A random sample of 136 attorneys have mean IQ score of 109.2 and standarddeviation IQ score 15. The ...

A: From the given information, Sample size (n) = 136 Sample mean (M) = 109.2 Sample standard deviation ...

Q: If the median of a data set is 760, the upper quartile is 950, and the lower quartile is 650, What i...

A: Given that, Median ,Q2=760 Upper quartile,Q​3​​ = 950 Lower quartile,Q​1​​ = 650  

Q: The least-squares regression model ŷ = -3.4+5.2x and correlation coefficient r = -0.66 were calculat...

A: The given least square regression model is as follows: and the correlation coefficient is –0.66.