3. A simple random sample of 60 items resulted in a sample mean of 80. The populationstandard deviation is o = 15.%3DCompute the 95% confidence interval for the population mean.Assume that the same sample mean was obtained from a sample of 120 items. Providea 95% confidence interval for the population mean.a.b.c.What is the effect of a larger sample size on the interval estimate?

Answered: Image /qna-images/answer/8fbf98f6-84b6-4004-8882-4245e920a539.jpg

Answered: 3. A simple random sample of 60 items…

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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A statistics class is estimating the mean height of all female students at their college. They collect a random sample of 42 female students and measure their heights. The mean of the sample is 65.3 inches and the sample standard deviation is 5.4 inches. Find the 90% confidence interval for the mean height of all female students in their school? Assume that the distribution of individual female heights at this school is approximately normal. 1. The t value is 1.3025 2. The standard error has a value of -- 3. The margin of error has a value of 4. Find the 90% confidence interval for the mean height of all female students in their school
Construct the confidence interval for the population mean.
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 79 dates, the mean record high daily temperature in a certain city has a mean of 85.60°F. Assume the population standard deviation is 14.98°F. Interpret the results. O A. You can be 90% confident that the population mean record high temperature is between the bounds of the 90% confidence interval, and 95% confident for the 95% interval. O B. You can be 90% confident that the population mean record high temperature is outside the bounds of the 90% confidence interval, and 95% confident for the 95% interval. O C. You can be certain that the population mean record high temperature is either between the lower bounds of the 90% and 95% confidence intervals or the upper bounds of the 90% and 95% confidence intervals. O D. You can be…
Given two independent random samples with the following results: n₁ = 16 n₂ = 8 x₁ = 94 X2: $₁ = 16 = 124 $2 = 28 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 2 of 3: Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.
Thirty randomly selected students took the calculus final. If the sample mean was 79 and the standard deviation was 5.7. Answer the following questions. 1. The degrees of freedom for the Studentized version of the sample mean is 2. The point estimate for the true mean score of all students is 3. The t-value for a 99% confidence interval, for this sample, is t = (Round to three decimal places) 4. The Margin of error for a 99% confidence interval for this sample is (Round to one decimal place) 5. The 99 % confidence interval estimate of the true mean score of all student is (Round to one decimal place) 6. The sample size is needed, at the 99% confidence level, in order to obtain a margin of error of no more than 1 is (Must be a whole number)
A statistics practitioner took a random sample of 54 observations from a population whose standard deviation is 29 and computed the sample mean to be 98. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 95% confidence, changing the population standard deviation to 43; Confidence Interval = C. Estimate the population mean with 95% confidence, changing the population standard deviation to 10; Confidence Interval =
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Determine the sample size needed to construct a 98 % confidence interval to estimate the population mean when the population standard deviation is 76.85, and the margin of error is 15.63. Use two decimal places for the critical value and round to the nearest integer for your final answer. Eg. 48.47 = 49
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.From a random sample of 66 dates, the mean record high daily temperature in a certain city has a mean of 85.22 F. Assume the population standard deviation is 15.45 F.

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