Find The critical valle T 912needed to construct a confidenceтоhavey Interval of the GivenOFlevel with given Sample sizea) For level 90% sampo size 7B) For level 980 and Sample 11C) Forlevel 95% and Sampo Size 25D) For level 99% and samplesize 14110

a)GivenConfidence level=90%sample size(n)=7

Answered: Find The critical valle T912 needed TO…

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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During the production of boiler plate, test pieces are subjected to a load, and their elongations are measured. In one particular experiment, five tests will be made, at loads (in MPa) of 11, 37, 54, 70, and 93. The least-squares line will be computed to predict elongation from load. Confidence intervals for the mean elongation will be computed for several different loads. Which of the following intervals will be the widest? Which will be the narrowest? a) The 95% confidence interval for the mean elongation under a load of 53 MPa. b) The 95% confidence interval for the mean elongation under a load of 72 MPa. c) The 95% confidence interval for the mean elongation under a load of 35 MPa.
10
To test whether the mean time needed to mix a batch of material is the same for machines produced by three manufacturers, the Jacobs Chemical Company obtained the following data on the time (in minutes) needed to mix the material. Manufacturer 1 2 21 31 19 27 29 18 25 34 22 23 30 21 Use Fisher's LSD procedure to develop a 95% confidence interval estimate of the difference between the means for manufacturer 1 and manufacturer 2. Round to two decimal places. Enter negative values as negative numbers. to
In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a rate of 10°C/s had an average Rockwell (B) hardness of 91.1 and a standard deviation of 6.23, and 40 welds cooled at a rate of 30°C/s had an average hardness of 90.7 and a standard deviation of 4.34. a) Find a 95% confidence interval for the difference in hardness between welds cooled at the different rates. b) Someone says that the cooling rate has no effect on the hardness. Do these data contradict this claim? Explain.
1 Suppose that the average time spent per day with digital media several years ago was 3 hours and 22 minutes. For last year, a random sample of 20 adults in a certain region spent the numbers of hours per day with digital media given in the accompanying table. Preliminary data analyses indicate that the t-interval procedure can reasonably be applied. Find and interpret a 90% confidence interval for last year's mean time spent per day with digital media by adults of the region. (Note: x=5.88hr and s=2.27hr.) The 90% confidence interval is from ( ? ) hour(s) to ( ? )hour(s). Interpret the 90% confidence interval. Select all that apply. A. There is a 90% chance that the mean amount of time spent per day on digital media last year by all adults in the region is between the interval's bounds. B.With 90% confidence, the mean amount of time spent per day on digital media last year by all adults in the region is between the interval's bounds. C.90% of all…
Age x and resting heart rate y were sampled for 25 randomly selected children from age 2 to 9. Summary information is: n = 25, Σx = 140.5, Σx2 = 903.75, Σy = 2567, Σy2 = 264, 457, Σxy = 14, 171.5 (a) Compute a 95% confidence interval for the average resting heart rate of 3 six year old children.
One method for measuring air pollution is to measure the concentration of carbon monoxide, or CO, in the air. Suppose Nina, an environmental scientist, wishes to estimate the CO concentration in Zagreb, Croatia. She randomly selects 45 locations throughout the city measures the CO concentration at each location. Based on her 45 samples, she computes the margin of error for a 95% t-confidence interval for the mean concentration of CO in Zagreb, in µg/m³, to be 4.28. What would happen to the margin of error if Nina decreases the confidence level to 90%? Nina increases the confidence level to 99%? Nina decreases the sample size to 33 locations? Nina increases the sample size to 65 locations? Answer Bank Increase Stay the same Decrease
Suppose college football scores are normally distributed with a population standard deviation of 6pts.
Assuming equal population variances, find a 99% confidence interval for the differences in mean of minutes taken to rich CBD by these two town residents.
Group Number of Children Mean PEF Std Dev PEF Chronic Bronchitis 25 281 68 No Chronic Bronchitis 25 319 74 Using the data presented above: a) Construct a 95% confidence interval for the mean PEF in children without chronic bronchitis b) Determine how many children would be required to ensure that the margin of error in (a) does not exceed 10 units.

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Find The critical valle T912 needed TO Construct a confidence havey Interval of the Given level with given Sample size a) For level 90% sampo Size 1 13) For level 9810 and Sample 11 C) For level as % and Sampo Size 25 D) For level 99% and samposize 14