A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 4pCi/L. The school samples the air for 36 days and finds an average concentration of 4.4pCi/L with a standard deviation of 1pCi/L. To test whether the average level of radon gas is greater than the safe level, the appropriate hypotheses are __________

Q: Find each of the requested values for a population with a mean of µ 40, and a standard deviation of…

A: Given, μ=40σ=8 A. The required z-score corresponding to x=52 is obtained as- z=x-μσ=52-408=128=1.5…

Q: A distribution has a population mean of 10.5 and a population standard deviation of 3.5. If X is a…

A: Introduction: It is required to find the value of X for it's given z-value or z-score, under the…

Q: A sample of 52 obsorvation is drawn from a population with standard deviation 60. Find C so that the…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

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Q: find the following probabilities. (Round your answers to four decimal places.) USE SALT (d) x is…

A: It is given that Mean = 81Standard deviation = 28

Q: We want to test a hypothesis that the average number of hours spent on housework is different from…

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Q: A random sample of males has a sample mean blood volume of x¯=5.2 liters, with a sample standard…

A: according to the Empirical rule 95% data will lie within 2 standard deviation of mean 95% volume…

Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…

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Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A:

Q: Fifteen different video games showing alcohol use were observed. The duration times of alcohol use…

A: Degrees of freedom: df denotes the sample size minus 1. That is, df=n-1

Q: mean 129.747 and standard deviation 0.87643 Determine the sample size required that will have an 80%…

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Q: The blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 261.6…

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Q: Number 19

A: It is given that s is 12, µ is 45 and M is 49.a)Here, n is 9.The formula for finding the value of r2…

Q: We would like to test a hypothesis regarding one population mean.  The null hypothesis is H0: μ =…

A: GivenThe null hypothesis is H0:μ=31.7sample size(n)=22Mean(x)=28.9standard deviation(s)=6.4

Q: H0:μ=5.3H0:μ=5.3 H1:μ≠5.3H1:μ≠5.3 Your sample consists of 43 subjects, with a mean of 5.6 and a…

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Q: 10. The established mean for the number of copies a customer makes per visit at a copy store is 37.…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…

A:

Q: State the null and alternative hypotheses for the above scenario.

A: HERE given, Our environment is very sensitive to the amount of ozone in the upper atmosphere. The…

Q: Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone…

A: Let 'x' be the amount of ozone in the upper atmosphere. The sample mean and standard deviation for a…

Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…

A: GivenMean(μ)=86standard deviation(σ)=23

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A:

Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…

A: Given that :  X is a random variable measured in miligrams of glucose per deciliter ( 1/10 of a…

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A:

Q: A tire manufacturer claims that the average life of a certain grade of tire is greater than 25,000…

A: A manufacturer claims that an average life of a tire is 25000 miles or more. A sample of n = 15 tire…

Q: In a population with a μ = 8, a score of X = 3 corresponds to z = –2.5. What is the standard…

A: Mean = 8 Raw score , X = 3 Z score = - 2.50

Q: The average I.Q. of the adult population is 100. A researcher believes that the average I. Q. of…

A: Given a random sample of 5 adults were tested and score 69, 79, 89, 99, and 109.  The standard…

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: Givenstandard deviation(σ)=21.1confidence level=99.5%Marin of error(E)=0.5

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: We take a random sample of 16 scores from a Math Exam and the sample mean is 80 (the population…

A: Sample mean =80.Sample standard deviation, s =15.The sample size, n is 16.

Q: In this scenario, what is the test statistic? An orthopedic surgeon would like to test the…

A: Formula to find test statistic when population standard deviation (σ)known : z0 = x¯ - μσn Where ,…

Q: of x = The contents of 35 cans of Coke have a mean 12.15oz. We know that the standard deviation is o…

A: given data,n=35x¯=12.15 ozσ=0.1 ozclaim that the population mean is μ=12 ozwe have to find out the…

Q: 4. A survey shows 47% of movie goers are males. A test is conducted to see if the proportion is…

A: Solution : Null Hypothesis : The hypothesis to be tested is is called as null hypothesis. Generally…

Q: Suppose the standard deviation of the sample mean is equal to 0.6. If a sample of size n=100n=100 is…

A: Given, Sample standard deviation of mean = 0.6 Sample size =100 Population standard deviation is…

Q: Mr. A, an owner of a particular softdrink brand claims that the average capacity of their product is…

A: Followings are the Explanation Of the question  Use the One Sample t test   Hypothesized Population…

Q: The average height of 18-year-old American women is 64.2 inches. You wonder whether the mean height…

A: Reviewing information, Given, μ0=Population mean=The average height of 18-year-old American…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: From the provided information, Population standard deviation (σ) = 79.4 Confidence level = 99%…

Q: ficance level to 5%, should she reject her hypothesis? (a) What is Alice’s null hypothesis? What…

A: Since, the question has more than 3 parts. As per the guidelines I am obliged to answer first three…

Q: In 1992 a national vital statistics report indicated that about 2.3% of all births produced twins.…

A: Test statistic already solved.  Test statistic z= -1.08

Q: 2. A technician is testing that the mean speed of internet connection is more than 4 Megabits per…

A: We hve to find null and  alternative  hypothesis

Q: The director of research and development is testing a new drug. She wants to know if there is…

A: Step 1:   Denote μ as the population mean time of the drug stays in the system.

Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…

A: Solution-: Given: μ=86,σ=23 Let, X= be the random variable measured in milligrams of glucose per…

Q: A random sample is obtained from a normal population with a mean of u=95 and a standard deviation of…

A: Introduction: Denote μ as the true population mean. It is given that, the sample size is, n = 16…

Q: For a population with a mean of u = 60 and a standard deviation of o = 4, a score of X = 56…

A: Introduction :-  Here we have to answer whether the given Z - score corresponding to X = 56 is true…

Q: 1. You want to test to see if the claim is correct. A math teacher claims the probability that a…

A: Hypothesis: A hypothesis is an assertion (or) statement about the population parameter Null…