In 1990, 58% of Americans 18 years old and older reported they have a great deal of concern regarding air pollution. A recent poll found that 592 of 1004 Americans 18 years old or older stated that they have a great deal of concern regarding the level of air pollution in American. Is there evidence to conclude that the current proportion of Americans having a great deal of concern about the level of air pollution in America is different from the 1990 proportion, with a 10% level of significance?  State the null hypothesis, alternative hypothesis, test statistic, p-value and conclusion.

Q: 61.3% of all Americanslike pepperoni on their pizza. Is this a parameter or statistic? Why?

A: Parameter is a numerical measurement that describing a characteristic of a population.

Q: As part of a dissertation at Oklahoma State University, Ota Lutz investigated the effect of teaching…

A: Test Statistic for Difference of two means is given by,   X bar= (summation Xi)/n S2= E(X2)-Xbar2…

Q: As part of a dissertation at Oklahoma State University, Ota Lutz investigated the effect of teaching…

A: The Independent Samples t Test compares the means of two independent groups in order to determine…

Q: Suppose that the unemployment rate for 18- to 34-year-olds was reported to be 10.6%. Assume that…

A: Given, The unemployment rate for 18- to 34-year-olds was reported to be 10.6% based on a random…

Q: Listed below are heights (in.) of mothers and their first daughters. The data are from a journal…

A:

Q: A consumer advocacy group is doing a large study on car rental practices. Among other things, the…

A: Solution: From the given information, it is to test whether the mean monthly mileage of cars rented…

Q: Would you expect the correlation between High School GPA and College GPA to be higher when taken…

A: The correlation shows the relationship between 2 variables.

Q: Explain what u understand by ANOVA using examples

A: It is an important part of statistics. It is widely used.

Q: In a 2015 study entitled How Undergraduate Students Use Credit Cards, it was reported that…

A: To find: What is the research hypothesis?

Q: The median number of part-time employees at fast-food restaurants in a particular city was known to…

A: The median number of part-time employees at fast- food restaurant is 18. There are 7 fast-food…

Q: An insurance company crashed four cars of the same model at 5 miles per hour. The costs of repair…

A: An insurance company crashed four cars of the same model at 5 miles per hour. The costs of repair…

Q: What term is used to explain the natural difference between a sample mean the overall population…

A: What term is used to explain the natural difference between a sample mean the overall population…

Q: A Heartland Monitor poll taken in Decmber 2016 obtained responses from 990 adult Americans to the…

A: Given table:

Q: Suppose when a data set with 32 values is treated as a "population", the value of the (population)…

A: Given that  Population Variance = 145.2  n = 32

Q: Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 43 of the…

A: Solution To find the confidence interval we will use the z distribution i.e. z critical value.

Q: Almost all medical schools in the United States require students to take the Medical College…

A: From the provided information, Mean (µ) = 500.0 Standard deviation (σ) = 10.6 Let X be a random…

Q: Imagine that the pregnancy test accurately indicates pregnancy in 97.5% of the people who have it.…

A: The miss rate will be 2.5%

Q: A company wanted to determine the child care costs of its employees. A sample of 25 employees were…

A: Solution :  In above example a value of one of the sample change so we know that standard deviation,…

Q: The three most common measures of central tendency are the mean, median, and mode. Each of these…

A: Mode is a measure of central tendency. It is the value that occurs most frequently in the data. Mode…

Q: imagine you’re hired by a beef company called “American Beef Makers” as a Data Analyst and you’re…

A: Please note that as per our guidelines if multiple sub-parts are there in a question we can answer…

Q: State the null and alternative hypothesis as an expression

A: Given that x1=12.5 x2=13.9 s1=3.9 s2=5.2 n1=14 n2=17

Q: Some people are concerned that new tougher standards and high-stakes tests adopted in many states…

A: Given : x = 210 n = 1782 Hypothesis : H0 : p ≤ 0.103 Ha : p > 0.103 p^ = 2101782 p^ = 0.1178 sp^…

Q: A researcher finds a significant correlation between the amount of time spent watching television…

A: No, Given statement is FALSE

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A: Number of adults described as "Republican or Leaning Republican" = 651Number of adults described as…

Q: If 94% of my data point are about a given number is the information left or right skewed?

A: If 94% of your data points are about a given number, it indicates that the distribution is highly…

Q: Why do you think that the mean is the most sensitive measure of central tendency?

A: We know that, mean is the ratio of sum of all observation and number of observation. Let, xi be the…

Q: In 2009, it was estimated that 63% of Americans supported the death penalty. In 2014, a Rasmussen…

A: sample size(n)=943 No. of Americans supported the death penalty(x)=536 population proportion=0.63

Q: If I have a sample of people’s ages, and the IQR is 20, what does this mean?

A: Given:  IQR for sample of people's ages is 20.

Q: If we have a data set containing the age and marital status of large group of individuals and we ask…

A: Independent samples t test: The independent samples t-test can be used to examine a possible…

Q: Smartphone Ownership. The Pew Internet&American Life Project conducted a survey of smartphone…

A: Solution: Let p1 be the proportion of smartphone owners are men and p2 be the proportion of…

Q: Suppose you are working on a research project that finds a strong negative correlation between…

A: The provided information implies that a negative correlation is found between "income" and…

Q: The relative risk of developing lung cancer among individuals who smoke is 15.0. Which of the…

A: Relative risk is the ratio of probability of an outcome in an exposed group to the probability of an…

Q: The correlation between mean 2015 Mathematics SAT scores and mean 2015 Writing SAT scores for all 50…

A: Given information: For all 50 states and the District of Columbia, the correlation between the mean…

Q: Suppose you are conducting a study about how the average U.S. worker spends time over the course of…

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Q: Why does the observed mean difference should not be taken seriously?

A: Mean difference(MD): Mean Difference is also known as Difference in means. Mean difference measures…

Q: A psychologist has designed an index to measure the social perspectives of elementary school…

A:

Q: A research article stated that there was a mean difference in depressive symptoms between male and…

A: From the provided information, The claim is that there was a mean difference in depressive symptoms…

Q: A researcher collected data on the palate length of 50 individual shrews of the same species.. She…

A: In this question, a researcher has collected data on the palate length of 50 individual shrews of…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.