Exercise 10.01 Algo (Inferences About the Difference Between TwoPopulation Means: Sigmas Known)The following results come from two independent random samples taken of two populations.Sample 1Sample 2n1 50n2 30x 1Icon Key=I= 13.8)=◄ Question 2 of 211.4X201 = = 2.202 = 3.2a. What is the point estimate of the difference between the two population means? (to 1decimal)Hint(s) Check My Work2.4b. Provide a 90% confidence interval for the difference between the two population means (to 2decimals).)c. Provide a 95% confidence interval for the difference between the two population means (to 2decimals).Hint(s) Check My Work

The sample 1 sample size is 50, sample mean is 13.8 and population standard deviation is 2.2. The…

Answered: The following results come from two…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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#2 A sample of 64 airplanes gave a mean air time (time spent flying) of 49 hours. If the standard deviation is 14.8 hours, construct a 90% confidence interval for u, the true mean air time.
Show all calculations for question 1 part a B c and d.
Consider the following results for independent random samples taken from two populations. Sample 1Sample 2n 1 = 20n 2 = 40x 1 = 22.4x 2 = 20.7s 1 = 2.2s 2 = 4.7 What is the point estimate of the difference between the two population means (to 1 decimal)?What is the degrees of freedom for the t distribution (round down your answer to nearest whole number)?At 95% confidence, what is the margin of error (to 1 decimal)?What is the 95% confidence interval for the difference between the two population means (to 1 decimal)? Use z-table. If your answer is negative value, entre minus (-) sign.(, )
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
Given two independent random samples with the following results: n₂ = 8 x₂ = 124 $2 = 28 = 16 n₁ x₁ = 94 $1 = 16 Use this data to find the 90 % confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Copy Data Step 1 of 3: Find the point estimate that should be used in constructing the confidence interval.
The following data represent the length of time, in days, to recovery for patients randomly treated with one of two medications to clear up severe bladder infections. Find a 95% confidence interval for the difference u, - H, between in the mean recovery times for the two medications, assuming normal populations with equal variances. Medication 1 n, = 11 x1 = 14 = 1.4 Medication 2 n2 = 12 X2 = = 17 2 = 1.2 S Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. The confidence interval is (Round to two decimal places as needed.)
2 different treatments were used to speed the relief time (in minutes) of migraines. 8 subjects received each treatment. The recovery times are listed below. Treatment 1: 20 19 29 25 34 32 39 38 Treatment 2: 18 18 16 17 29 28 21 37 Construct a 90% confidence interval for the difference in the relief time between the 2 treatments.
7. What is the 95% confidence interval for the difference in the population means, µ1 - µ2, given the data from the two independent samples: n1 =56, x1= 58.2, s1= 4.3, n2=45, x2=60.2, s2=5.5 B. [-3.28 , -0.72] C. [-3.60, -0.40] D. [-3.65 , -0.35] A. [-3.96 , -0.04] 8. What is the 98% confidence interval for the difference in the population means, µ1 - µ2, given: n1= 22, x1= 41.4, s1= 5.9, n2= 19, x2= 43.2, s2= 6.5 D. [-3.48 , -0.12] B. [-3.07 , -0.53] A. [-3.12, -0.48] C. [-3.18, -0.42]
In a sample of seven cars, each car was tested for nitrogen oxide emissions (in grams per mile). The results appear below. Assuming that nitrogen oxide emissions are normally distributed, 4. Car 1 2 3 4 5 6 7 Nitrogen oxide emission (g/mi) 0.13 0.18 0.15 0.09 0.12 0.18 0.08 a. Construct a 95% confidence interval for the mean amount of nitrogen oxide emissions for all cars. b. What effect would increasing the level of confidence have on the length of the interval?
A. True or False? A researcher compares the BMI of two populations of individuals from different socioeconomic backgrounds and finds that the proportion of individuals considered obese and from a poor background is .37 (n = 112), and the proportion of individuals considered obese and from an affluent background is .27 (n = 87); a 95% confidence interval for the risk difference for obesity among members of the poor population compared to the affluent population is (-0.03, 0.23). B. Why is it true or false?
Consider the following data drawn independently from normally distributed populations: (You may find it useful to reference the appropriate table: z table or t table) X₁ = -28.3 2 $1 n1 = 22 = 8.7 X2 = -18.5 2 S2 = 7.9 n2 = 16 a. Construct the 95% confidence interval for the difference between the population means. Assume the population variances are unknown but equal. (Round final answers to 2 decimal places.) Confidence interval is to
Given two independent random samples with the following results: n₂ = 8 x₂ = 175 $2 = 11 n₁ = 12 x₁ = = 157 $₁ = 32 Use this data to find the 95% confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed. Copy Data Step 1 of 3: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

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