A college president says, “99% of the alumni support my firing of Coach Boggs.” You contact an SRS of 200 of the college’s 15,000 living alumni and find that 66 of them support firing the coach.   What population does the inference concern here? Explain clearly what the population proportion p is in this setting. What is the numerical value of the sample proportion ˆp ?

Q: of parents of children in high school felt it was a serious problem that high school students were…

A: Three conditions:1. Random: The sample is selected randomly, the first condition is satisfied.2.…

Q: Researchers at the University of Nebraska are interested in determining the average number of…

A: Before collecting data for maple roots it is important if the random sample is taken and the…

Q: When the sample size is 15 and you are doing a t test, the number of degrees of freedom is 15. True…

A: Given that  Sample size n =15 Degree of freedom =df =n-1

Q: 5. Suppose a 12 year old asked you to explain the difference between a sample and a population, how…

A: As per our guidelines, we are allowed to answer first question only. Please repost next question…

Q: Suppose that you conduct a hypothesis test for a proportion using a sample size of n=50 and you…

A: Answer: As sample increases  the p-value decreases.

Q: If a hurricane was headed your way, would you evacuate? The headline of a press release states,…

A: Sample size = n = 4625 Sample proportion = p̂ = 0.32

Q: You work for NASA and are interested in determining the population proportion, with 99% confidence,…

A:

Q: Twenty years ago, 53% of parents of children in high school felt it was a serious problem that high…

A:

Q: Explain the basic idea for performing a hypothesis test, based on independent samples, to compare…

A:

Q: An article in a newspaper states that the proportion of traffic accidents involving road rage is…

A: An article in a newspaper states that the proportion of traffic accidents involving road rage is…

Q: isn't the sample size should be 35, not 12?

A: We have given that the information presented by the tutorial school related to the IELTS  mock…

Q: True? When we collect random samples to test the claim that the proportion of female CIA agents…

A: In a binomial distribution with total number of trails n and probability of success p, the normal…

Q: illustrates the effect of sample size on the power of a two-sample t test?

A: A test of hypothesis consists of 2 hypotheses: the null, H0, and the alternative, H1.   For a sample…

Q: In a simple random sample of size 76, there were 34 individuals in the category of interest. Compute…

A: Given: Sample size (n) = 76 Let x be the number of individuals in the category of interest

Q: In 1992​,researchers investigated the effect of​ weed-killing herbicides on house pets. They…

A: Given, In 1992​,researchers investigated the effect of​ weed-killing herbicides on house pets. They…

Q: True or False: For all two-sample tests, the sample sizes must be equal in the two groups.…

A: There are two types of two sample test, one is dependent samples and other is independent samples.

Q: What is the sample proportion such that 95% of all others is symmetric around 36%?

A: 1. A sample of 200 students is taken in which 36% of all college students use an Apple i phone only.…

Q: Based on a sample of 80 men, 35% owned cats Based on a sample of 40 women, 50% owned cats The test…

A:

Q: Suppose we are interested in carrying out the following test: Họ :p = 0.50 H. :p > 0.50 What is the…

A: Given Information: Sample Proportion = 0.43          Sample Size     = 35 Now since the sample size…

Q: Twenty years ago, 46% of parents of children in high school felt it was a serious problem that high…

A:

Q: What happens to the sample size when you don’t know a prior sample proportion?

A: To calculate the sample size when we do not know prior sample proportion.

Q: If the sample size is n=16 what is likely true about the shape of the population?

A: Solution:  Central limit theorem: The central limit theorem state that as the sample size increases…

Q: an independent-samples t test, you will usuall

A: the test statistic for independent-samples t test = μ1-μ2-0combined standard deviation

Q: If you draw a random sample of 100 scores from a large population of test scores and compute the…

A: As we increase z value, corresponding probability of occurence decreases. hence, The event among…

Q: should their sample size be?

A: here use solvin's formula

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: The formula for margin of error is given as follows: E=zα/2p11-p1n+p21-p2n

Q: 6. Twenty years ago, 46% of parents of children in high school felt it was a serious problem that…

A: As per our guidelines we are suppose to do only one question6)

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: From the provided information, Sample size (n) =750 and p0 = 0.54

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A:

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The proportion is p0=0.52 The total number of samples n=700 The value of…

Q: Why doesn't it make sense to test the hypothesis that the sample mean is 42?

A: It is given that the hypothesis test is sample mean is 42.

Q: For a sample of n=15 scores, how many scores are used to calculate the sample variance ?

A: Given that : For a sample of n=15 scores, how many scores are used to calculate the sample variance…

Q: an airline promotion to business travelers is based on the assumption that two-thirds ofbusiness…

A: From the information, the given values are, a) Claim: Two-thirds of business travelers use a laptop…

Q: Twenty years ago, 47% of parents of children in high school felt it was a serious problem that high…

A: Given that  Sample size n =900 Population proportion p=47%=0.47

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The value of p0 is 0.52 and the sample size n is 800.

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The hypothesis tests, contain two hypothesis: null hypothesis and alternate hypothesis. The…

Q: In a simple random sample size of 89, there were 40 individuals in the category of interest. It is…

A: Solution

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: Given n=850 P0=0.54 so n*P0(1-P0) = 850*0.54*(1-0.54) =211.1

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A:

Q: A newspaper article about the results of a poll states: "In theory, the results of such a poll, in…

A: Margin of error = 0.05 Sample proportion = 0.99 z critical value at 0.05 is 1.96

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A:

Q: 2. For Americans using library services, the American Library Association claims that at most 70% of…

A: Given: The random sample of patrons selected are n=100. The number of patrons who borrowed books are…

Q: a radio talk show host asked listeners to respond either yes or no to the question,  is the…

A: Population: Population consists of the complete subjects or individuals of interest that are…

Q: Twenty years ago, 57% of parents of children in high school felt it was a serious problem that high…

A: From the provided information, Population proportion (p0) = 0.57 Sample size (n) = 700 and x = 244

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: Given : n = 700 p = 0.52

Q: P(-2.5 < t < 2.5) with a sample size of 15 ?

A: Given that  Sample size (n) = 15 Degrees of freedom (df) = (n-1) = 15-1 = 14   Here asked about…

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: Given: Hypothesized population proportion(p0)=0.52Number of parents in survey(n)=800Total parents…

Q: A substitute teacher wants to know how students in the class did on their last test. He asks only…

A: Step 1 The sample is 10 students sitting in the front row as the teacher asked only those 10…

Q: A researcher deciding to increase the desired sample size from n = 25 to n = 100 prior to collecting…

A: Given that: A researcher wants to Increase the size of the sample from n =25 to n=100 prior of the…

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.