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 anormal distribution.Nicotine in menthol cigarettes 80% confidence; n=28, s=0.24 mg.Click the icon to view the table of Chi-Square critical values.df = 27 (Type a whole number.)x-Save(Round to three decimal places as needed.)

Given N=28 S=0.24 Confidence level=80% We need to find the critical chi-square value and…

Answered: Points: 0 of 1 Use the given…

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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Recreational Time A researcher wishes to see if there is a difference between the mean number of hours per week that a family with no children participates in recreational activities and a family with children participates in recreational activities. She selects two random samples and the data are shown. Use μ1 for the mean number of families with no children. At =α0.05, is there a difference between the means? Use the critical value method and tables. State the hypotheses and identify the claim. H0: Claim or not a Claim H1: Claim or not a claim Find the Critical Value(s): Round answer to at least 3 decimal places. Compute the test Value: Round the answer to at least 3 decimal places. Make the decision Summarize the results. There is or is not enough evidence to support the claim or reject the claim. X σ n No children 8.9 2.7 35 Children 10.5 2.8 35
For the following claim, find the critical value. Assume that a simple random sample has been selected from a normally distributed population. Claim: The mean IQ score of statistics professors is greater than 118. Sample data: n=21, x= 119, s= 10. The significance level is a= 0.05. Click the icon to view a table of critical t-values. Find the critical value using at-distribution table, The critical value is (Round to three decimal places as needed.) io
Claim: P > 7 8 , the test statistic is z = 2.68 , significance level is 0.02. Find P-value and critical value. P-value is(round it to four decimal places) critical value is(round it to two decimal places)
Using the z table (The Standard Normal Distribution Table), find the critical value (or values) for the two-tailed test with =α0.11 . Round to two decimal places, and enter the answers separated by a comma if needed. Critical value(s) :
cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence assuming s=14.7 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? A 99% confidence level requires ________ subjects. (Round up to the nearest subject.)
Find the critical value and rejection region.
Test the claim that the mean GPA of night students is significantly different than 2.8 at the 0.1 significance level. Based on a sample of 70 people, the sample mean GPA was 2.81 with a standard deviation of 0.03 The positive critical value is: (to 2 decimals)
Clgarette Smoking A researcher found that a cigarette smoker smokes on average 32 cigarettes a day. She feels that this average is too high. She selected a random sample of 9 smokers and found that the mean number of cigarettes they smoked per day was 29. The sample standard deviation was 2.9. At a =0.01, is there enough evidence to support her claim? Assume that the population is approximately normally distributed. Use the critical value method and tables. Part 1 of 5 (a) State the hypotheses and identify the claim. Ho: u = 32 not claim H : u < 32 claim This hypothesis test is a one-tailed test. Part: 1 /5 Part 2 of 5 (b) Find the critical value(s). Round the answer to three decimal places. If there is more than one critical value, seperate them with commas. Critical value(s):
Using The t Distribution Table, find the critical value(s) for the t test for a right-tailed test with n=14 and α =0.05. Enter the answers separated by a comma if needed. Critical value(s)=
critical value p vaule and z value
Find the critical value t, for the confidence level c = 0.90 and sample size n= 15. t-Distribution Table Click the icon to view the t-distribution table. Level of t = (Round to the nearest thousandth as needed.) confidence, c One tail, a Two tails, a 0.80 0.90 0.95 0.98 0.99 0.10 0.05 0.025 0.01 0.005 d.f. 0.20 0.10 0.05 0.02 0.01 d.f. 3.078 6.314 12,706 31.821 6 965 1 63.657 1 2 1.886 2.920 4.303 6.965 9.925 3 3.182 4.541 5.841 2193 1.638 2.353 3 747 4 1.533 2.132 2.776 3.747 A.604 4 1.476 2.015 2.571 2 765 3.365 4.032 6 1.440 1.943 2.447 3.143 3.707 6. 1.415 1.895 2.365 2.998 2 400 3.499 7 8. 1,397 1.860 2.306 2.896 3.355 8. 9. 1.383 1.833 2.262 2.821 3.250 10 1.372 1.812 2.228 2.764 3.169 10 1.363 1.356 1.350 11 1.796 2.201 2.718 3.106 11 12 1.782 2.179 2.681 3.055 12 13 1.771 2,160 2.650 3.012 13 14 1.345 1.761 2,145 2.624 2.977 14 15 1.341 1.753 2.131 2.602 2.947 15
Sick Days in Bed A researcher wishes to see if the average number of sick days a worker takes per year is less than 5. A random sample of 29 workers at a large department store had a mean of 4.7. The standard deviation of the population is 1.3. Is there enough evidence to support the researcher's claim at a=0.10? Assume that the variable is normally distributed. Use the critical value method with tables. Part: 0 / 5 Part 1 of 5 State the hypotheses and identify the claim with the correct hypothesis. (Choose one) H |(Choose one) This hypothesis test is a (Choose one) test.

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