What are you drinking? Environmental Protection Agency standerds require that the emount of lead in drinking water be lessthan 15 micrograms per liter. Twelve samples of water from a particular source have the following concentrations, in units ofmicrograms per liter. Assume the population standerd deviation is a-5. if appropriate, perform a hypothesis test to determinewhether you can conclude that the mean concentration of lead meets the EPA standards, Use the t-0.01 tevel of significanceand the /'value method with the T1-54 calculator.11.6 14211.8 149 159 9.813.58.6123 17.7 9.815.KSend data to ExcetPart: 0/6Part 1 of 6Explain why it is necessery to check that the population is approvimately normal before performing a hypothesis test.It is necessary to check that the popuation is approximately narmal because

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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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I am working on my class project. I do not know how to explain Type I and Type II errors based on my data.
What does it mean when sample results are statistically significant?
☐True ☐False As a general rule, as the sample size increases the probability of rejecting the null hypothesis decreases.
A one-way ANOVA is called "one-way" because of which of the following it predicts the outcome variable using one predictor variable multiple predictor variables can be used, but they all only predict one outcome variable. there's only one way to do it No answer text provided.
Hypothesis Test of the Difference Between Two PAIRED Means. Im pretty sure this should be a one tailed test, as does my teacher does an example for this and her's had one tail. Help me understand which tail it is (what lead you to believe it was right or left tail.) I will need the test statistic and critical value(s). You will need the null and alternative (H0: u1=u2, H1: u1=/=u2). The equation that is needed to solve this is t= d *bar* - Ud / (Sd/*square root* of n) D.O.F formula to be used is n-1. This is all the infomartion I think you need might need to determine the kind of problem this is. I've asked this question before but it seems I didn't provide enough information and the answers included two tailed test or something else. Oh also I need these formulas to be used, as in no excel to speed things up because as much as i like shortcuts I need to understand this concept. Standard dev or Sx should be 1.414213562. Pretty sure this is right, not 100%. d *bar* should = -2, pretty…
Answer these questions A, B, C and D question
True or false? In a hypothesis test, the critical region consists of sample outcomes that have a high probability of occurring if the null hypothesis is true.
Test the claim that for the population of statistics final exams, the mean score is 79 using alternative hypothesis that the mean score is different from 79. Sample statistics include ?=17, x¯=80, and ?=16.s=16. Use a significance level of ?=0.01.. (Assume normally distributed population.)The test statistic is
Question Heip How do the requirements for a chi-square test for a variance or standard deviation differ from a z-test or a t-test for a mean? Choose the correct answer below. OA A chi-square test can only be used when the population has a normal distribution. On the other hand, a z-test or a t-test can only be used when the sample size is at least 30. O B. A chi-square test can only be used when the population has a normal distribution. On the other hand, a z-test or a t-test can be used when either the population has a normal distribution or the sample size is at least 30. O C. Az-test or a t-test can only be used when the population has a normal distribution. On the other hand, a chi-square test can be used when either the population has a normal distribution or the sample size is at least 30. O D. Az-test or a t-test can only be used when the population has a normal distribution. On the other hand, a chi-square test can only be used when the sample size is at least 30. Click to…
In doing a test of statistical significance, you will have made a Type I error if you concludethat there is no difference between means in the population when in fact there is a difference the absence of a difference in the samples is due to chance any difference in the samples is due to chance there is a difference between means in the population when in fact there is no difference
Scenario: I'm interested in whether there is a relationship between Team (A vs. B) and Outcome (Good vs. Bad). Below are the data. Test the null hypothesis that the categories are independent. α= .05. Team A Team B Good Outcome fo = 75 fe = fo = 45 fe = Bad Outcome fo = 25 fe = fo = 5 fe = The expected frequency, fe , for the Team A X Good Outcome category = _____

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Epain why it is necessery e check that the population is approimately normal before performing a hypothesis test. It is necessary to check hat the population is approximately normal because