An environmentalist wishes to conduct a hypothesis test on the percentage of cars driven in a cities that are hybrids. Is it sufficient for him to use a simple random sample of 114 cars of hyper is currently a count for 8% of the car sales in the country, and he claims that the percentage of hybrids in the city is higher than that

Q: As of November 2010, three Spider-Man movies have been released, and their mean length is 120…

A: To construct a confidence interval for the true mean length of all Hollywood movies made since 2000,…

Q: A funding agency has performed an internal study in which the number of loan requests (Y variable,…

A: To obtain the regression line that allows us to estimate the number of loan requests (Y) as a…

Q: Compare the percentiles to the quartiles respectively. Are the values different?

A: We have to compare the percentiles and quartiles of the given data.

Q: Answer the given problem. Process the data in excel and present the results. A researcher is…

A: Given that, The random variable X is sodium intake The random variable Y is the Blood Pressure The…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ = 105 and a…

A: Obtain the Z-score for the random variable X equals 135. The Z-score for the random variable X…

Q: داد *** 9m 10 21 17 13 28 5 20 r- : 7 7 $ 25 USE SALT . 2 = 2500 2 = 99 22 - 4,948 12 - 763: Ey =…

A: Given ∑x=250, ∑y=99, ∑x2=4948, ∑y2=763, ∑xy=1882

Q: Fewer young people are driving. In 1995, 63.9% of people under 20 years old who were eligible had a…

A:

Q: Mr. Guo receives many spam emails each day. A random sample of 12850 emails in his inbox indicates…

A: It is specified that for 12850 sampled emails (i.e., the sample size, n=12850), the no. of emails…

Q: A machine is set to produce disc plates with a mean diameter of 14 mm. A sample of 8 discs gave a…

A: Given: A machine is set to produce disc plates with a mean diameter of 14 mm that is μ = 14 Sample…

Q: Suppose a simple random sample of size n=1000 is obtained from a population whose size is…

A: b) p = 0.72  n = 1000  Mean(µ) = np =1000*0.72 =720  Standard deviation (σ) = √[np(1-p)]…

Q: Workers and senior-level bosses were asked if it was seriously unethical to monitor employee e-mail.…

A: a. It is needed to check whether the response is independent of whether the subject is a worker or a…

Q: In a randomized controlled trial with two treatment groups, what sample size is necessary to detect…

A: Determining the necessary sample size for a randomized controlled trial (RCT) involves considering…

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: Sample size (n)=43 Sample mean=5.1  Sample standard deviation (s)=1.2  Population Mean μ=4.5  We…

Q: 1. Find the value of k that makes f(x) a valid pdf. -{ f(x) = k(3+x), 0≤x≤2 elsewhere 0,

A: From the information, given the pdf is,

Q: With repspect to the equation for c, the question mentions 10% of the loaf will always be starter.…

A: Yes, you are correct. The fact that the loaf will always be 10% starter should be incorporated into…

Q: A random sample of 25 statistics examinations was selected. The average score in the sample was 77…

A: Sample size (n) = 25 Mean x̅ = 77 Sample variance s2 = 169 So, standard deviation (s) = 13…

Q: A pollster asks a single question with only yes and no as answer possibilities. The poll is…

A: a) Suppose p is the true proportion of of yes.

Q: Assume that a randomly selected subject is given a bone density test. Those test scores are normally…

A: We have given that a randomly selected subject is given a bone density test. Population mean, µ = 0…

Q: Number of Employees: 1,400 Based on last year's performance distribution, The employees received a…

A: Answer:- Given table is, Total number of employees, n = 1400  Using formula, Expected value = n*p

Q: A. The given random number table consists of.    ​odd-numbered digits. (Round to two decimal places…

A: Given that A large collection of one-digit random numbers should have about 50% odd and 50% even…

Q: Describe all the errors in the student’s scatterplot.​

A: Here we are given a set of data and a graph according to the data as below

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and standard…

Q: 4. A statistic is said to be unbiased if A) both the person who calculated the statistic and the…

A: Given data :  A statistic is said to be unbiased if A) both the person who calculated the statistic…

Q: Poisson distributions have a unique property where the mean is equal to: the variance the standard…

A: The probability mass function of the Poisson distribution is as follows, P(X=x)=λx×e-λx! , x=0,1,...…

Q: 21. What is the probability of selecting someone from the general population at random who would…

A: Given that Population mean=100  Standard deviation =5  We have to find 21.. probability of selecting…

Q: n a survey, the planning value for the population proportion is p* = 0.25. How large a sample should…

A: population proportion is= p = 0.25. CI=0.95E=0.06n=?

Q: Find the value of the standard normal random variable z, called zo such that: (a) P(z ≤ zo) = 0.9398…

A: standard normal curve,X~N(0,1)we have to find out the given probabilities.

Q: large population of 5,000 students take a practice test to prepare for a standardized test. The…

A: given data N = 5000μ = 146σ= 70sampling distribution of mean have standard deviation = 10n = ?

Q: Which of these tests can examine categorical variables that have more than two groups? Binomial test…

A: Given that Which of these tests can examine categorical variables that have more than two groups?…

Q: Critical values of the Chi-square distribution with d degrees of freedom Probability of exceeding…

A: Degree of freedom =df =3 Test statistic χ2 =7.5

Q: The state lottery board is examining the machine that randomly picks the lottery numbers. On each…

A: Probability = favorable trials/Total trials  Here :  Total trials = 500   Here :  Outcomes = 0 to 9…

Q: You may need to use the appropriate appendix table or technology to answer this question. A local…

A: Data given 83,91,94,64,70

Q: 3. A phenomenon is observed many, many times under identical conditions. The proportion of times a…

A: Here use basic definition of statical terms.

Q: The 95% confidence interval for the population slope was calculated as (0.751,0.947). Based on the…

A: We have given  The confidence interval for slope is given to be (0.751, 0.947)

Q: Why do the results imply that long term investing is less risky than short term investing

A: The results imply that long-term investing can be a profitable strategy because, on average, the…

Q: Engineers want to design seats in commercial aircraft so that they are wide enough to fit 99% of all…

A: Given that: Mean(μ)=14.7 Standard deviation(σ)=0.9 X~N(μ,σ)

Q: 59 Use technology to find the​ P-value for the hypothesis test described below. The claim is that…

A: The question is about hypo. testing Given : Claim : The mean of 12 AM body temp. is greater than…

Q: On a particular day, a restaurant that is open for lunch and dinner had 176 customers. Each cust…

A: The contingency table is given as follows:   Dessert No dessert Row Total Lunch 7…

Q: A particular article reported the accompanying data on phenotypes resulting from crossing tall…

A: If an experiment is used to check whether the sample information is taken from the population…

Q: Interpret the slope and the y-intercept in the context of the problem.

A: The data is defined below as follows:   From the information, given that   Let X denotes the…

Q: 9.28 The file  [Fast Casual] contains the amount that a sample of 15 customers spent for lunch ($)…

A: Given data: Significance level = 0.05 Sample size = 15

Q: a. What is the number of degrees of freedom that should be used for finding the critical value /?…

A:

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given : Sample Size, n = 36 Sample Mean, x̄ = 61.9 sample standard…

Q: Suppose a sample of 20 engineers employed with a company for three years has been rank ordered with…

A: State the hypotheses. That is, there is no evidence to conclude that there is a significant…

Q: In the test of hypothesis H0:μ=100 vs .  Ha:μ≠100, we already have the  p-value for this test:…

A: The hypothesis is H0:μ=100 vs Ha:μ≠100 and p-value for this test is 0.025.

Q: . Cereal. The amount of cereal that can be poured into a small bowl varies with a mean of 1.5 ounces…

A: Note: Thankyou! for the question. As you have mentioned we will be providing answers for parts d, e…

Q: variance

A:

Q: A binomial experiment is given. Decide whether you can use the normal distribution to approximate…

A: sample size[n] =12 P =68%     =68/100    =0.68 q = 1-p    =1-0.68    =0.32

Q: Check My Work At 95% confidence, how large a sample should be taken to obtain a margin of error of…

A:

Q: 3,500 randomly chosen voters are asked in a national poll if they approve of the job the president…

A: Here, in the above information we can say that 3500 people are sample and national people is…