Provided below are summary statistics for independent simple random samples from two populations. Use thepooled t-test and the pooled t-interval procedure to conduct the required hypothesis test and obtain the specifiedconfidence interval.x₁ = 13, S₁ = 2.2, n₁ = 19, x₂ = 15, S₂ = 2.5, n₂ = 19a. Two-tailed test, α = 0.05b. 95% confidence intervalNext, compute the test statistic.t= (Round to three decimal places as needed.)Now determine the critical values.(Round to three decimal places as needed.)±ta/2 = ±What is the conclusion of the hypothesis test?Since the test statisticin the rejection region,b. The 95% confidence interval is from to(Round to three decimal places as needed.)Ho.Time Remaining: 01:29:12Submit test

The provided sample information is: x¯1=13; s1=2.2; n1=19x¯2=15; s2=2.5; n2=19 The desired…

Answered: Provided below are summary statistics…

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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Two groups were selected for an experiment. The sample data is reported: Group A Group B Sample Mean Spending/day ($) 170 150 Sample Standard deviation ($) 10 5 # of Females 9 7 Sample Size 36 42 a. Set up a 99% confidence interval for the mean difference in spending between the two groups. b. At the 10% level test the alternate hypothesis that group B has lower spending level than Group A.
During the nutrition research, the amount of consumed kilocalories per day was measured for 18 people - 10 women and 8 men. Results are as follows: Women: 2026, 1600, 1700, 1950, 1922, 1786, 1712, 1777, 2006, 1832; Men: 2170, 2557, 2384, 2427, 2334, 2228, 2161, 2459. Calculate a 90% confidence interval on the mean for women and men separately. Assume distribution to be normal. Round your answers to the nearest integer (e.g. 9876). Women: i Men: i
Find the value for each ta/2 Prompts Submitted Answers n = 18 for the 99% confidence interval for the Choose a match mean. n = 10 for the 90% confidence interval for the Choose a match mean. n = 15 for the 98% confidence interval for the Choose a match mean.
The mean score on the math portion of the ACT for the year 2000 is μ = 20.7. A sample of 20 students in a local school district had a mean of 22.95. Using the sample, a 95% confidence interval estimate for the mean is (20.76, 25.14). State the point estimate for the mean ACT score for students. Based on this sample information , do you believe that the local students have a mean different from the general population? Why? 22.95 is in the center of the interval. The means are definitely not different. 22.95 is just outside the 95% confidence interval. Can't say the means are really different. 22.95 is not equal to 20.7. The means are definitely different. 20.7 is just outside the 95% confidence interval. Can't say the means are really different.
In a sample of 10 randomly selected black bears from northeast Pennsylvania, the sample mean was 214.1 pounds and the sample standard deviation was 51.1 pounds. Construct a 99% confidence interval estimate for the population standard deviation of all black bears in this region.
Estimate the minimum sample size needed to achieve the margin of error E=0.013 for a 95% confidence interval.
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Two different simple random samples are drawn from two different populations. The first sample consists of 40 people with 20 having a common attribute. The second sample consists of 1800 people with 1291 of them having the same attribute. Compare the results from a hypothesis test p1=p2 (with a 0.05 significance level) and a 95% confidence interval estimate of p1-p2. What are the null and alternative hypotheses for the hypothesis test?
Trace metals in drinking water affect the flavor and an unusually high concentration can pose a health hazard. Ten pairs of data were taken measuring zinc concentration a local water source. 0.415 0.238 0.390 0.410 0.605 0.609 0.632 0.523 0.411 0.612 Build a 90% confidence interval for the true concentration of zinc. Assume the conditions for inference are met.

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