4. A random sample of size 64 is drawn from a population with mean 80 and standard deviation 20. Describe the sampling distribution of the sample mean. 7. A random sample of size 400 is selected form a population with population proportion T = 0.8. Describe the sampling distribution of the sample proportion.

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A:

Q: 3. It was observed that the standard deviation of the number of hours people are glued to their…

A: 3. The provided information is  σ=13.43

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A: Confidence interval is an inference process which gives the plausible values of the population…

Q: simple random sample comprised of the following data: 55, 23, 15, 6, 31. What is the point estimate…

A: Given that  Data -  55, 23, 15, 6, 31. Number of data values (n) = 5 Sum of data value = 55+…

Q: 2. The head of a school clinic in a certain elementary school wants to estimate the mean height (in…

A: Given that alpha =0.05,s.d =30 ,M.E = 4

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A: The population mean is 56.3. The population standard deviation is 8.6. We have to write which…

Q: It is estimated that 48% of all motorists use their seatbelts. If a police officer observes 400 cars…

A: Note: Hi there! Thank you for posting the question. As there are multiple sub parts, according to…

Q: 31.The National Center for Health Statistics reports that the mean systolic blood pressure for males…

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A: Given data Sample size ,n=100 Sample mean  x ̅  =4.9 letters Sample SD , s=0.15 letters

Q: The distribution of new car prices in a certain city is strongly skewed right with a mean of 45…

A: Given that the distribution of new car prices in a certain city is strongly skewed right with…

Q: the mean and standard deviation of a population are 200 and 20 respectively. suppose the sample size…

A: Given data,μ=200σ=20If n=36the mean of the sampling distribution=?

Q: 5. If you want to be 85% confident of estimating the population mean sampling error of +5 and the…

A: At 85% confidence level, the z value is 1.44 which can be obtained by using the standard normal…

Q: Suppose the true proportion of voters in the county who support an independent candidate for county…

A: We have given that,  True proportion or probability (p) = 0.42 Then,  q= 1 - p = 1- 0.42 = 0.58 q=…

Q: Suppose that you are attempting to estimate the weight of 600 parts. In order to use the infinite…

A:

Q: Suppose that 29% of undergraduates at a large university are involved in a campus organization. The…

A: We have given that the Binomial distribution with parameters n=100 and p=0.29 , q=0.71. Formulae in…

Q: A government agency provides the number of miles that residents of the 75 largest metropolitan areas…

A: The random variable X follows normal distribution. There are two samples of data which are named as…

Q: Suppose that the caffeine in one tablespoon of Folgers is normally distributed with a mean of 45 mg…

A:

Q: "The water bills for residents in Davao City have a mean of Php3406 and a standard deviation of…

A: We have given that,  Mean = 3406, population standard deviation (σ)= 236 and sample size (n) = 109…

Q: In a distribution where the mean is 80 and the standard deviation is 3​, find the largest fraction…

A: Given

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A: Solution: The proportion of population who drive a Prius hybrid vehicle is From the given…

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.35.…

A: the pdf of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

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A: Sampling Distribution of a Normal Variable :  Given a random variable X. Suppose that the population…

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A:

Q: 4.  Find a 99% confidence interval for the difference of the means. Use Excel Two Means Calculator…

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A:

Q: The following is a list of the ages of employees at Hammers Inc . Find the mean and the sample…

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Q: 2. A normally distributed population has mean 57,800 and standard deviation 750. Find the mean and…

A: To find the mean and standard deviation of the sample means for samples of size 100:

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A:

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.55.…

A: Given Information: Population proportion Sample size   If repeated samples of size n are taken…

Q: if a population has a mean  of 75 and a standard deviation of 15    (a) what is the mean of the…

A: Given,sample size(n)=25mean(μ)=75standard deviation(σ)=15

Q: According to the U.S. Census Bureau, the number of people in a household has a mean of 2.6 and a…

A: As per our company guidelines, we are supposed to answer ?️only the first 3 sub-parts. Kindly repost…

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.35.…

A: Here, n = 145 and p = 0.35.

Q: agent claims that mean household incomes in Fairfax and Arlington are equal. Draw 32 residents…

A: A z-test for two means is a hypothesis test that attempts to make a claim about the population…

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A: Given: Population consists of the value = 11, 15, and 20

Q: Based on data obtained from A.C. Nielsen, the mean # of televisions in a household in the United…

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Q: what would you expect the shape, center and spread of the sampling distribution of the proportion of…

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Q: Suppose the true proportion of voters in the county who support a new fire district is 0.53.…

A:

Q: The annual salary for one particular occupation is normally​ distributed, with a mean of about…

A: Given : μ = 132000 , σ= 16000 and n= 26

Q: If the sample size is 100 and the population standard deviation is 20, then the standard deviation…

A: Given  True or false question Sample size=100  Population standard deviation=20  We need to…

Q: Suppose a random sample of n measurements is selected with probability of success p = . 35. Given n…

A: Solution: From the given information, p=0.35 and n=200.

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.62.…

A: Solution: From the given information, the true proportion of voters in the county who support a new…

Q: How would the sampling distribution of    change if I increase the sample size to 1,000 residents?

A: Here use concept of sampling distribution and central limit theorem

Q: 11- Assuming that IQ is normally distributed with a mean of 100 and a standard deviation of 15,…

A: NOTE: According to the guidelines, we are supposed to solve first question only. Please repost other…

Q: For a large Internet seller their average customer spent $51.28 during the Black Friday sale with a…

A: Solution

Q: Suppose the percentage of married couples who own a home is 33% for a given population. What is the…

A: From the provided information, The percentage of married couples who own a home is 33% (p) = 0.33…

Q: If we take samples of size 110 from a population with proportion 0.39, comment on whether the…

A: Solution: 9. From the given information, n=110 and p=0.39.

Q: A school administrator wants to see if there is a difference in the number of students per class for…

A: From the given information, it is clear that,  In portland classes,  Sample size n1=28 Sample mean…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.