How do you solve these problems? What t* critical value would you use for a confidence interval for the population mean in each of thefollowing situations? Use 3 decimal places.(a) For a 95% confidence interval based on n = 13 observations: X 2.160(b) For a 99% confidence interval from an SRS of 23 observations: X 2.807(c) For an 80% confidence interval from a sample of size 6: X 1.440FeedbackGeneral FeedbackFor a confidence level C, calculate a = 1 - C. Then find the t-value associated with the 1-2percentile. Then use the = t.inv (probability, df) formula in Excel, with df = n - 1.

Answered: What t* critical value would you use…

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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Find the critical value, t c, used for a 97% confidence interval for the mean with a sample size of 33. Round to three decimal places. Provide the positive critical value.
A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal?
The fire chief selects a sample of 49 local firefighters from a population with a mean physical fitness rating of 72 and a standard deviation of 7 on a 100 point scale. The mean of the sample equals 74. The chief is interested in whether the fitness of the officers is now different from the original population value. Construct the appropriate hypothesis and perform the appropriate test with α set to .05. Compute the effect size Construct and interpret the 95% confidence interval around the sample mean.
Create a 85% confidence interval for a population proportion from a sample of size 103 with sample proportion ˆpp^ = 4110341103. ( , ) [three decimal accuracy] [three decimal accuracy]
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in a random sample of 300 unemployed women living in rural areas, 189 indicated that they last worked more than one year ago. Likewise, in a random, independent sample of 700 unemployed women living in urban areas, 399 indicated that they last worked more than one year ago. Is the proportion of unemployed women who last worked more than one year ago lower in urban areas than it is in rural areas? Using the critical value approach, test at the 10% level. What is your conclusion? (Note: In answering this question, make sure you state the following: null and alternative hypotheses, test statistic and critical value.
From a large number of actuarial exam scores, a random sample of 200 scores is selected, and it is found that 148 of these 200 are passing scores. Based on this sample, find a 90% confidence interval for the proportion of all scores that are passing. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. What is the lower limit of the 90% confidence interval? What is the upper limit of the 90% confidence interval?
In order to estimate the average GPA of all students at SCC, we selected a random sample of 36 students and found that their average GPA is 2.1 with a s. d. of 0.8.Construct a 95% confidence interval for the average GPA of all students at SCC.
1. Determine the positive z-score for a 90% confidence interval. positive z = [three decimal accuracy] 2. Create a confidence interval for a population proportion for a point estimate of 0.6 with a margin of error equal to $0.06. ( , ) [three decimal accuracy] [three decimal accuracy]
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Shea wants to estimate the difference between two population means and plans to use data collected from two independent simple random samples of sizes n 1 = 24 and n 2 = 29. She does not know the population standard deviations, so she plans to construct a two-sample t - confidence interval for the difference in the two means. Use a t ‑distribution table to determine the positive t ‑critical value needed to construct a 95 % confidence interval using a conservative estimate of the number of degrees of freedom. Enter the positive critical value precise to three decimal places.
A random sample of 50 roundtrip flights between New York and Chicago has an average airfare of $400 with a sample standard deviation of $50.0. The critical value for an 95% confidence interval around this sample mean is ________.

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