Given the information provided, if the trial were to be repeated with the aim of halving the width of a 95% confidence interval for the reduction in swim time due to taking caffeine, how many people should be tested? Thank you :) VolunteerSwim time withplacebo (mins,1km)Swim time withcoffee (mins,1km)VolunteerSwim timewith placebo(mins, 1km)Swim timewith coffee(mins, 1km)1226.5 22.6 24.4311 1220.7 20.64 51324.924.9 22.1 23.2 23.5 24.7 20.914625.3 21.321.2 23.31516726.422.4 22.3 21.2 24.4 22.7 20.7 27.217819.5 19.5 26.523.3 23.4 25.3 21.9922.7 24.8 22.118101923.8 22.42022.722.4 22.0 21.5

Let us construct the confidence interval for the difference in swim time between placebo and coffee:…

Answered: Given the information provided, if the…

Given the information provided, if the trial were to be repeated with the aim of halving the width of a 95% confidence interval for the reductio

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: An independent-samples study comparing two treatment conditions produces a t statistic with df = 16.…

A: The formula of degrees of freedom is,

Q: If you need to make a 98% confidence interval for a proportion, and the margin of error is to be no…

A: Given information: Confidence level = 98% Margin of error (e) = 0.025 Let proportion (p) = 0.5 The…

Q: If n=16, ¯xx¯(x-bar)=46, and s=12, construct a confidence interval at a 95% confidence level. Assume…

A: Given n=16 x=46 s=12 CL=95% Data is normally distributed

Q: There are many reasons adults use credit cards. A recent survey found that 66% of adults used credit…

A: 66% of adults use credit cards for convenience.Confidence level is 99% i.e., 0.99.Margin of error is…

Q: For the following paired observations,please calculate the 95% confidence interval for the…

A: Given: data A={16.51, 15.3 , 20.12 } B={11.22 , 11.77 , 13.28 } Calculate the 95% confidence…

Q: If n = 560 and X = 448, construct a 95% confidence interval for the population proportion, p. %3D…

Q: Solve the following problems according to the proper test to be used: In a before and after…

A: From the above given data the following solution is provided below:

Q: A 95% confidence interval for a population mean was reported to be 148.69 to 155.31. If σ = 15, what…

A: given data 95% ci for mean : (148.69,155.31)σ = 15n = ?

Q: If you wish to estimate a population mean with a sampling distribution error SE= 0.31 using a 95%…

A: The sample size needed is obtained below as follows : Obtain the area of probability in the right…

Q: For the following data, determine if it would be appropriate to find a confidence interval for the…

A: Proportion can be determined by dividing the total number of items in the survey by the number of…

Q: For a confidence level of 80% with a sample size of 24, find the t-score.

A: From the provided information, Confidence level = 80% Level of significance (α) = 1 – 0.80 = 0.20…

Q: If n=19, ¯xx¯(x-bar)=37, and s=13, construct a confidence interval at a 99% confidence level. Assume…

Q: If n = 370 and p=0.31p, construct a 90% confidence interval. This should be rounded to three decimal…

Q: Do sports drinks help prevent cramps in endurance sports? At the end of a marathon, officials will…

A: Observational study: In observational study, the individuals of the study are observed by the…

Q: For the following statement explain what's wrong: A 95% confidence interval for the mean response is…

A: The statement is incorrect because the width of a confidence interval can vary depending on the…

Q: n=31, ¯xx¯(x-bar)=30, and s=5, construct a confidence interval at a 98% confidence level. Assume the…

Q: 6. to the nearest percentage point, the margin of error for this survey is?

A: Given: Lower limit = 0.74 Upper limit = 0.86 The point estimate can be calculated as: Point estimate…

Q: Identify the t-score for a 90% confidence interval if the sample size is 25. t = The answer isnt…

A: We have given that Confidence level (c) = 90% = 0.90 Significance level (α) = 1 - c = 1 - 0.90 =…

Q: Given: SE = 0.484, df = 1414, and 95% CI = (19.3, 21.3) Is the population distribution normal? Why…

A: Given: Mean = 20.3 Median = 18.2

Q: How large would the sample need to be so that a 95% confidence interval would have a margin of…

Q: B. Construct a 95% confidence interval estimate of 4-4, the difference between the mean weight of…

A: Given Information: B) 95% confidence interval estimate of difference between the mean weight of…

Q: Sales of trumpets in a day is modeled as Normal. A random sample of 36 days is looked at. The sample…

Q: = 18 for a repeated-measures t sta nts.

A: Given that, for a repeated measure t-test.To identify whether the given statement is true or false.

Q: In a study on caffeine and stress, college students (n = 10) indicated how many cups of coffee they…

A: The research hypothesis is that there is an association between stress and cups of coffee consumed…

Q: If n=23, ¯x (x-bar)=38, and s=5, find the margin of error at a 99% confidence level

A: The degrees of freedom is obtained as follows:

Q: We have conducted a one sided hypothesis test with a significance level a = 0.10. We would like to…

A: Answer - We have conducted a one sided hypothesis test with a significance level α = 0.10

Q: For a repeated –measures study comparing three treatment conditions with a sample n =4 participants,…

A: Given, n=4 k=number of treatments =3 The SS between subjects is given by the formula:…

Q: survey, the planning value for the population proportion is p=0.3. How large a sample should be…

A: p=0.3 , margin of error=0.08

Q: Estimate 95% confidence interval for the proportion of household experiencing burglary in 2010."

A: 25.8 households per 1,000 were the victims of home burglary. These data are obtained from a survey…

Q: f you wish to estimate a population mean with a sampling distribution error SE= 0.28 using a 95%…

Q: If X= 102, o=9, and n=63, construct a 95% confidence interval estimate of the population mean, μ.

A: Formula to constructing the confidence interval about mean , when the population standard deviation…

Q: H1: p v (Please enter a decimal) c. The test statistic zv = (please show your answer to 3 decimal…

A: From the given What is the Alternative hypothesis Test statistic (z ) =? P value = ?

Q: A sample of 30 beams has an average strength of 1908.8 lbs. and s = 327.1. what is the 95%…

Q: If X=72, σ=13, and n=66, construct a 95% confidence interval estimate of the population…

Q: If n=19, x= 47, and s = 8, find the margin of error at a 99% confidence level Give your answer to…

Q: Use the following summary to answer the items that follow: The intensive treatment group reported…

A: Given that Z statistic =3.75 Alpha=0.01

Q: If n = 530 and X = 424, construct a 99% confidence interval for the population proportion, p. Give…

Q: 20. Suppose a 90% confidence interval is stated as (0.3011, 0.4189). What is the sample proportion…

A: The given 90% confidence interval for population proportion is, (0.3011, 0.4189) The upper limit is,…

Q: earcher wants to determine the proportion of elm trees in Windsor, Ontario, dying of Dutch elm…

Q: If n=25, 7(x-bar)=48, and s=4, find the margin of error at a 80% confidence level

A: The sample size is 25, sample mean is 48, and sample standard deviation is 4. The degrees of freedom…

Q: If n=26, ē(x-bar)=31, and s=4, find the margin of error at a 90% confidence level Give your answer…

Q: You are comparing men and women on hours spent watching TV. You pick a sample of 12 men and 14 women…

Q: If X=68, σ=14, and n=66, construct a 95% confidence interval estimate of the population mean, μ

Question

Given the information provided, if the trial were to be repeated with the aim of halving the width of a 95% confidence interval for the reduction in swim time due to taking caffeine, how many people should be tested? Thank you :)

Volunteer
Swim time with
placebo (mins,
1km)
Swim time with
coffee (mins,
1km)
Volunteer
Swim time
with placebo
(mins, 1km)
Swim time
with coffee
(mins, 1km)
1
2
26.5 22.6 24.4
3
11 12
20.7 20.6
4 5
13
24.9
24.9 22.1 23.2 23.5 24.7 20.9
14
6
25.3 21.3
21.2 23.3
15
16
7
26.4
22.4 22.3 21.2 24.4 22.7 20.7 27.2
17
8
19.5 19.5 26.5
23.3 23.4 25.3 21.9
9
22.7 24.8 22.1
18
10
19
23.8 22.4
20
22.7
22.4 22.0 21.5

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Similar questions

Consider the following results for independent samples taken from two populations; Sample 1 N 400 X 0.48 Sample 2 N300 X 0.36 A. What is the 90% confidence interval for the difference between the two population proportions? Round your answers to four decimal places B. What is the 95% confidence interval for the difference interval between the two population proportions? Round you answer 2 decimal places and use a 0 in front of the decimal places.
In a survey, the planning value for the population proportion is p* 0.25. How large a sample should be taken to provide a 95% confidence interval with a margin of error of 0.02? Round your answer up to the next whole number. =
A psychologist would like to research if the Hope scale (Synder, et al., 1991) scores differ between those living in City A and City B. The 12-item scale consisted of two subscales: a 6-item agency subscale and a 6-item pathways subscales. Scores on the 12 items were averaged, with higher scores indicating higher levels of hope. The following scores were obtained. Use Student’s t Test for Independent Groups, alpha at .05 2 tail City A 43 38 36 38 52 60 58 66 55 63 City B 62 34 35 52 58 72 57 55 80 67 Alternative hypothesis: ____________ Null hypothesis: ____________ t obtained: ____________ t critical: ____________ df: ____________ Cohen’s d: ____________ P value: ____________ Decision: ____________ Solution:
If n=14, ¯xx¯(x-bar)=34, and s=4, construct a confidence interval at a 80% confidence level. Assume the data came from a normally distributed population.
Identify the t-score for a 95% confidence interval if the sample size is 15. t = the answer isnt 2.131 so what is the answer?
For a sample with a mean of 10, a std of 5 and an n of 30, what is the lower bound of the 95% confidence interval?
Sample # 1 and has been provided in the second screenshot (hand written)
If n=200 and X=70, construct a 99% confidence interval estimate for the population proportion. SAS (Round to four decimal places as needed.)
Imagine that you obtain a random sample of 125 M&M candies, and you notice that 28% of these candies are blue. If we convert the sample percentage of 0.28 to a sample proportion (by dividing 28 by 100), we get 0.28.
If n=12, x¯(x-bar)=47, and s=3, find the margin of error at a 80% confidence level
If n=23, ē(x-bar)=34, and s=2, find the margin of error at a 98% confidence level Give your answer to two decimal places.
The recidivism rate for convicted sex offenders is 12%. A warden suspects that this percent is different if the sex offender is also a drug addict. Of the 322 convicted sex offenders who were also drug addicts, 48 of them became repeat offenders. What can be concluded at the a = 0.01 level of significance? a. For this study, we should use z-test for a population proportion V b. The null and alternative hypotheses would be: Ho: ? v Select an answer (please enter a decimal) H1: ? v Select an answer v (Please enter a decimal) c. The test statistic ? v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? V a f. Based on this, we should Select an answer v the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the population proportion is not significantly different from 12% at a = 0.01, so there is statistically insignificant evidence to conclude that the population proportion of…