Chapter 107)The concentration of benzene was measured in units of milligrams per liter for a simplerandom sample of five specimens of untreated wastewater produced at a gas field. The samplemean was 7.5 with a sample standard deviation of 1.7. Seven specimens of treated wastewaterhad an average benzene concentration of 3.3 with a standard deviation of 1.6. It is reasonable toassume that both samples come from populations that are approximately normal. Construct an 80% confidence interval for the reduction in benzene concentration after treatment. Round the finalanswer to one decimal place.8

Answered: Chapter 10 7)The concentration of…

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 process is in statistical control with a mean of 79.5 mm and a standard deviation of 1.85. The upper specification limit is 80.2 mm, and the lower specification is 78.6 mm. What are the values of Cp, Cpk?
The Department of Agriculture wants to determine whether the mean yield per acre for a particular variety of soybeans is different this year compared to the historical avg yield of 520 bushels per acre. Thus, the null and alternative hypotheses are Ho: mu = 520 Ha: mu is not = to 520 You set out to conduct a hypothesis test at the 95% level. Mean yields are distributed Normally. You take a sample of 36 different acres. From this sample, you calculate a mean yield of 573 and a std deviation of 24. What are the critical values for this hypothesis test? Group of answer choices -2.58 and 2.58 -2.56 and 2.56 -1.64 and 1.64 -1.96 and 1.96
An article reports the following values for soil heat flux of eight plots covered with coal dust. 35.0 32.8 35.0 33.6 36.7 27.0 18.7 24.7 USE SALT The mean soil heat flux for plots covered only with grass is 29.0. Assuming that the heat-flux distribution is approximately normal, does the data suggest that the coal dust is effective in increasing the mean heat flux over that for grass? Test the appropriate hypotheses using a = 0.05. State the appropriate hypotheses. OH₂M = 29 H₂:μ#29 OH₂ = 29 H₂:μ 29 Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to three decimal places.) t = P-value = State the conclusion in the problem context. O Do not reject the null hypothesis. There is sufficient evidence to conclude that there was an increase in mean heat flux. O Reject the null hypothesis. There is sufficient evidence to conclude that there was an increase in mean heat flux. O Do not reject the null hypothesis. There is…
Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 19 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with ? = 0.36 gram.
in a population of Yorkshire hogs, sample statistics indicate the following: Average Days to 250 lbs. (Days)= 160 Variance of Days = 9 Use the graphing paper attached to illustrate the normal distribution of Days in this population. Draw the bell shaped curve, label the mean, label the parameters showing where 68%, 95% and 99% of the population would be.
Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 11 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with ? = 0.22 gram.
A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
Please reply as soon as possible. Maxforce inc manufactures racquetball racquets by two manufacturing processes (A and B). Because the management of the company is interested in estimating the difference between the avarage time it takes to each process to produce a racquet, they select independent samples from each process. The results of the samples are shown below Process A Process B Sample size 32 35 sample mean (in min) 43 47 Population standard deviation. 8 8.5 1. Develop a confidence interval estimate for the difference between the avarage time of the two process. 2. Is there a conclusive evidence that one process takes longer than the other?Use both critical value and the p- value approach
Assume that you have been provided the following information for a sample of cars The covariance between weight and miles per gallon is equal to -4.9 pound-miles. The standard deviation of the cars' mileages is 7.75. The standard deviation of the cars' weights is 0.94. Estimate the correlation coefficient to the first decimal place.
In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national average for girls at this age is reported as follows: µ = 63.80 inches with a standard deviation, s = 2.66 inches. 1. What is the effect size Cohen’s d and what does it tell us about the effect? 2. Compute the z-statistic.
16a 16b
The Department of Agriculture wants to determine whether the mean yield per acre for a particular variety of soybeans is different this year compared to the historical avg yield of 520 bushels per acre. Thus, the null and alternative hypotheses are Ho: mu = 520 Ha: mu is not = to 520 You set out to conduct a hypothesis test at the 95% level. Mean yields are distributed Normally. You take a sample of 36 different acres. From this sample, you calculate a mean yield of 573 and a std deviation of 24. Do you reject or not-reject the null hypothesis? Group of answer choices Do not reject the null hypothesis. Reject the null hypothesis.

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