QUESTION 7A field is to be surveyed for pesticide residues. Other fields treated in similar ways have been shown to have residues of 40–200ug/g, with a standard deviation of about 30 ug/g. If an error level of + 3 ug/g is acceptable, how many samples are needed to be 95%confident that the requirement is met?enevaFor the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).BIUSParagraphArial10ptAiroon,x² X2 San+,ABCierg田用田EXErene<> Ť {}ImeREAulti!!!田

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 2AGP

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Find the mean hourly cost when the cell phone described above is used for 240 minutes.
Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of m= 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample mean of xbar= 7.2 ppb arsenic, with s= 1.9 ppb. Does this info indicate that the mean level of arsenic in this well is less than 8ppb? Use a= 0.01. Show full detail.
Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of mu equals 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 36 test gave a sample mean of x-bar = 6.9 ppb arsenic, with s = 2.6 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Alpha = 0.01. a) What is the level of significance? b) What is the value of the sample test statistic? Round answer to 3 decimal places. c) estimate the p-value?
A doctor in the oncology department of a hospital surveyed the breathing rateof cancer patients. The mean and standard deviation of breathing rates for a group of patients are 12 and 2.3 breaths per minute, respectively. State the theorem applied"proportion of the patients having breathing rates from 7.4 to 16.6 breaths per minute" and explain why this theorem is chosen.
On average, a coffee machine fills into 214 milliliter cups. Sometimes, the machine makes errors with an estimated variance of 81. What is the standardized score for a randomly selected coffee cup that measured 250 milliliters? Answer:
TYPEWRITTEN ONLY FOR UPVOTE. DO THIS COMPLETELY. SHOW SOLUTIONS AND ALSO FILL OUT THE TABLE BELOW. SKIP IF YOU ALREADY DID THIS
Raw scores on standardized tests are often transformed for easier comparison. A test of Math ability has a Mean of 153 and a Standard Deviation of 10 when given to 3rd-graders. While 6th-graders have a Mean of 164 and a Standard Deviation of 7 on the same test. Leslie is a 3rd-grade student who scores 159 on the test. Hollis is a 6th-grade student who scores 168 on the test. Calculate the z-score for each student. Who scored higher within their grade-level? O Hollis; because her z-score is closer to the Mean for 6th-graders than Leslie's is for 3rd-graders. Leslie; because her z-score is larger than Hollis' z-score. O Leslie; because she is almost as smart as Hollis. O Hollis; because 168 is higher than Leslie's 159. O Leslie; because she is 6 points higher than the 3rd-grade level Mean while Hollis is only 4 points higher than the 6th-grade level Mean. Question 6 4 pts
Is this possible to do using the ti-84 plus calculator? (not all calculators have the same functions) If not please use show how to using step by step with actual figures. A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment,14 subjects had a mean wake time of 103. min. After treatment, the 14 subjects had a mean wake time of 93.5 min and a standard deviation of 21.2 min. Assume that the 14 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 103.0 min before the treatment? Does the drug appear to be effective?
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