The proportion of the first 25 subscribers of a limited media-streaming services with dailystreaming times exceeding 3 hours is recorded for 75 independent replications of asimulation model, each consisting of a month and with identical initial conditions. Therecorded proportions have sample mean 0.27. Construct a 90% confidence interval for thisproportion.(Zo.1 = 1.28, Zo.05 = 1.64, Zo.025 = 1.96)half-width of the interval:central value:lower bound:

To construct a confidence interval for the proportion, we can use the formula:Confidence Interval =…

Answered: The proportion of the first 25…

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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Samples of 100 8-hour shifts were randomly selected from the police records for each of two districts in a large city. The number of police emergency calls was recorded for each shift. The sample statistics are listed below. Region 1 2 Sample Size 100 100 Sample Mean 2.6 3.4 Sample Variance 1.24 2.54 Find a 90% confidence interval for the difference in the mean numbers of police emergency calls per shift between the two districts of the city. (Use μ₁ − μ₂. Round your answers to two decimal places.) calls per shift to calls per shift
The burning rates of two different solid-fuel propellants used in aircrew escape systems are being studied. It is known that both propellants have approximately the same standard deviation of burning rate; that is, a₁ = ₂ =3 cm/s. From a random sample of size n₁ = 20 and n₂ = 20, we obtain₁ = 18.02 cm/s and ₂ = 24.31 cm/s. Construct a 95% confidence interval on the difference in means μ₁ - 1₂. Round your answers to 3 decimal places (e.g. 98.765). What is the upper bound of the two-sided confidence interval?
Find the value of tn-1, a needed to construct a 95% upper or lower confidence bound with sample size 7. (Round the final answer to three decimal places.)
A school district decided to measure the BMI of all 3rd graders and identify the highest 1% and lowest 1% of those students. If the distribution is converted to a z distribution, what would be the upper critical z value and lower critical z value that mark the two significant areas at the tails?
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.
A random sample was selected from a population having a normal distribution. Calculate a 90% confidence interval estimate for for each of the following situations: (a). = 134, n = 10, s = 3.1 (b). = 3,744, n = 120, s = 8.2 (c). = 40.5, n = 9, = 2.9
I really need help with section e line 5 only. The only blank.
Samples of 400 printed circuit boards were selected from each of two productionlines A and B. Line A produced 40 defectives, and line B produced 80 defectives.Using an estimate for each line, do the data indicate that the two lines produce adifferent fraction of defective circuit boards, with 97% confidence.
Regression methods were used to analyze the data from a study investigating the relationship between roadway surface temperature x₁ = 1478, (x) and pavement deflection (y). Summary quantities were n = 20, Σy; = 12.75, Σy² = 8.86, Σx, Σ x = 143215.8, and Σxy. = 1083.67. Yi Find a 90.0% confidence interval on each of the following: (a) Slope. [i (b) Intercept. [i i i (c) Mean deflection when temperature x = 75 °F. [i i ] (Round your answers to 5 decimal places.) i ] (Round your answers to 3 decimal places.) (d) Find a 90.0% prediction interval on pavement deflection when the temperature is 75 °F. ] (Round your answers to 3 decimal places.) ] (Round your answers to 3 decimal places.)
An international organization is investigating the relationship between the life expectancies of men and women in nonindustrialized countries. A random sample of such countries was selected, and life expectancies, in years, were determined for both men and women. A check of the conditions necessary for inference on the slope of a regression line shows that they are met. A 98 percent confidence interval for the slope of the regression line relating life expectancy for men, xx, and women, yy, is given by (1.01,1.34)(1.01,1.34). Based on the interval, which of the following claims is supported? A. Since the interval does not contain 0, it can be concluded that there is no linear relationship between the life expectancies of men and women in nonindustrialized countries. B. Since the interval does not contain 1, it can be concluded that there is no linear relationship between the life expectancies of men and women in nonindustrialized countries. C. Since the values in the interval are…

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