Use the given information to find the number of degrees of freedom, the critical values x and x, and the confidence interval estimate of a. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 80% confidence; n= 26, s0.23 mg E Click the icon to view the table of Chi-Square critical values. df = 25 (Type a whole number.) - (Round to three decimal places as needed.)

Use the given information to find the number of degrees of freedom, the critical values x and x, and the confidence interval estimate of a. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 80% confidence; n= 26, s0.23 mg E Click the icon to view the table of Chi-Square critical values. df = 25 (Type a whole number.) - (Round to three decimal places as needed.)

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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The null and alternate hypotheses are:H0: μ₁ = μ2H1: μ₁ ≠ μ2 A random sample of 10 observations from one population revealed a sample mean of 26 and a sample standard deviation of 5.0. A random sample of 8 observations from another population revealed a sample mean of 30 and a sample standard deviation of 6.0. The population standard deviations are unknown but assumed to be equal. At the 0.01 significance level, is there a difference between the population means?
1. For a random sample of size n = 100 from a normally distributed population has a sample mean of x ̅ = 20.85 and a sample standard deviation of s = 13.41. Find: a. 95% confidence interval for the population mean μ
Solve the following problem and give as an answer the LEFT limit of the confidence interval. Write up to two decimal places without rounding. The anthropologist William Howells took data on cranial distances of remains found in Yauyos, Peru. One of the measurements is the distance between basion and bregma, denoted BBH, the data collected in his sample is shown below. Mean: 122.43mm Std Deviation: 3.5159mm The sample size is 101. finds a confidence interval for the variance of the BBH measure of the remains found in Yauyos with a confidence level of 90%.
Given a sample mean of xbar=27 and a population standard deviation of σ=3.5 from a previous study where n=16 values, find the z value and p value. The data indicates that the population mean for the speed of a Belgian Malinois is µ=30 mph, but we think it may be higher based on our data. Test the claim that µ<30 with alpha value of a=0.05.
A sample of n = 7 scores is selected from a population with an unknown mean ( µ). The sample has a mean of M = 40 and a variance of s 2 = 63. Which of the following is the correct 95% confidence interval for µ?
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If you were constructing a 99% confidence interval of the population mean based on a sample ofn = 41 where the standard deviation of the sample is S = 15, the critical value of t will be
assume that you have a sample of n1=9, with the sample mean x1=50, and a sample standard deviation of S1=5, and you have an independent sample of n2=15 from another population with a sample mean of X2=31, and the sample deviation S2=7. Construct a 99% confidence interval estimate of the population mean difference between u1 and u2. Assume that the two population variances are equal.
11. Consider the following questions about CIs (Confidence intervals). A researcher tests emotional intelligence (EI) for a random sample of children selected from a population of all students who are enrolled in a school for gifted children. The researcher wants to estimate the mean emotional intelligence EI for the entire school. The population standard deviation, , for EI is not known. Let’s suppose that a researcher wants to set up a 95% (Confidence intervals) CI for IQ scores using the following information: The sample mean M = 130. The sample standard deviation s = 15. The sample size N =120. The df = N – 1 = 119. For the values given above, the limits of the 95% CI are as follows: Lower limit = 130 – 1.96 x 1.37 = 127.31; Upper limit = 130 + 1.96 x 1.37 = 132.69. The following exercises ask you to experiment to see how changing some of the values involved in computing the CI influences the width of the CI. Recalculate the CI above to see how the lower and upper limits (and the…
For parts a and b, use the t tables, software, or a calculator to estimate. For parts c and d, use software or a calculator to estimate. a) the critical value of t for a 90% confidence interval with df=25. b) the critical value of t for a 99% confidence interval with df=89. c) the P-value for t≥1.38 with 4 degrees of freedom. d) the P-value for t>1.41 with 25 degrees of freedom. LOADING... Click the icon to view the t table. a) What is the critical value of t for a 90% confidence interval with df=25? nothing (Round to two decimal places as needed.) b) What is the critical value of t for a 99% confidence interval with df=89? nothing (Round to two decimal places as needed.) c) What is the P-value for t≥1.38 with 4 degrees of freedom? nothing (Round to three decimal places as needed.) d) What is the P-value for t>1.41 with 25 degrees of freedom? nothing (Round to three decimal places as needed.)
Consider the following hypothesis test: H0: mu >= 20 Halpha:mu < 20 A sample of 50 provided a sample mean of 19.4 . The population standard deviation is 2 . a. Compute the value of the test statistic (to 2 decimals). Enter negative value as negative number. b. What is the p-value (to 3 decimals)? c. Using alpha= 0.05, can it be concluded that the population mean is less than 20? d. Using , what is the critical value for the test statistic (to 3 decimals)? Enter negative value as negative number. State the rejection rule: Reject if is - Select your answer -greater than or equal togreater thanless than or equal toless thanequal tonot equal toItem 5 the critical value. Using , can it be concluded that the population mean is less than ? - Select your answer -YesNoItem 6
The pulse rates of 147 randomly selected adult males vary from a low of 35 bpm to a high of 103 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 90% confidence that the sample mean is within 33 bpm of the population mean. A. . Find the sample size using the range rule of thumb to estimate "SIGMA" n= ____? B. Assume that sigmaσ=10.7 bpm, based on the value s =10.7 bpm from the sample of 147 male pulse rates n=____? thank you !