Provide an appropriate response. Determine the sample size required to estimate the mean score on a standardized test within 4 points of the true mean with 90% confidence. Assume that s = 15 based on earlier studies.

Q: A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose…

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Q: The U.S. Department of Transportation provides the number of miles that residents of the 75 largest…

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Q: Find the sample size need to find the Population Mean if the margin of error is $105, the confidence…

A: Solution: From the given information, confidence level is 0.95, σ=315 and E=105.

Q: Nationally, patients who go to the emergency room wait an average of 6 hours to be admitted into the…

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Q: The incubation time for Rhode Island Red chicks is normally distributed with mean of 30 days and…

A: Let X be the incubation time for the chicks. It is given, X~N30, 22 To calculate P[24<X<26]…

Q: A sports shop records the sales of items made in China and those made in America. Country of origin…

A: From the provided information, The mean and standard deviation for the sales from China is as…

Q: An advertising executive wants to estimate the mean weekly amount of time consumers spend watching…

A: Margin of error is the error due to random sampling. The margin of error decreases with an increase…

Q: The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants…

A: Sample points are 9.0,7.3,6.0,8.8,6.8,8.4,6.6. Sample size = n = 7.

Q: The measure of skewness for a certain distribution is 0.8. If the lower and upper quartiles are 44.1…

A: Solution:

Q: A telephone company wants to estimate the mean number of minutes people in a city spend talking long…

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Q: Decide if the statement is True or False. A sampling distribution of sample means has a standard…

A: The standard deviation of the sampling distribution of sample means is given by:

Q: The time spent by a teacher at work in the holidays is normally distributed with a mean of 20 hours…

A: Given: Mean = 20 Standard deviation = 5

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

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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: The number of hours worked per week for a sample of ten students is shown below. Student Hours 1 2…

A: Note- As per our policy we can answer the first 3 sub-parts of a question.   Given information- The…

Q: throughout America and decides to focus on the height data, given in meters, which are repro…

A: Given data :  Height of skyscrapers ( meters) 107.5 108.2 133.6 151.4 155.8 149…

Q: community college Math instructor feels that the average number of units students enroll in each…

A: Hypothesis testing  Hypothesis testing is conducted for the parameters of the population like…

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: The mean number of travel days per year for salespeople employed by three hardware distributors…

A: Sample size: Sample is the part of the population that will help us to draw the inference about the…

Q: The number of people standing in the line to vote at the last Presidential Election at 7:00 P.M. was…

A: In statistics, three measures of central tendency are widely used. These three measures are also…

Q: Consider a test of coordination that has a normal distribution, a mean of 60 and a standard…

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Q: Construct the normal curve given the mean and standard deviation of a set of data. μ = 43.2, σ = 6.9

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Q: Assume the sample standard deviation is s=10, what do you conclude?

A: here given, sample mean = 87 n = 25 sample standard deviation  = 10

Q: An insurance company wants to know if the average speed at which men drive cars is greater than that…

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Q: We are going to calculate the standard deviation for the following set of sample data. 1) First,…

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Q: In a normal distribution, 31% of the items are under 45 and 8% are over 64. Find the mean and the…

A: Given Data: Let X represent the variable P(x<45)=0.31 P(x>64)=0.08   X~ Normal μ, σ2   To…

Q: given that the sample mean=105, pop standard deviation=27, n=44, a=0.01 what is the critical s-score

A: Note: In this question it has mentioned that we have to find the s – score but it seems that it is a…

Q: A video game company studied the time teens spent playing video games each night by surveying 1,500…

A: When the size of the sample is increased then the value of margin of error is decreased because…

Q: Use the normal distribution of SAT critical reading scores for which the mean is 513 and the…

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Q: If the standard error of the mean is σx̅ = 3 and the sample size is n = 64, then the population…

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Q: A point estimate for the sample mean is: (select one) s, Sample standard deviation Oz, Z- score Ox,…

A: Introduction: A point estimate of a population parameter is a single value based on the sample…

Q: A local university administers a comprehensive examination to the recipients of a B.S. degree in…

A: In question,  Given that A local university administers a comprehensive examination to the…

Q: use a one sample z-test to determine whether or not a sample mean of 34 differs from the population…

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Q: The mean number of travel days per year for salespeople employed by three hardware distributors…

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Q: Assume that a sample is used to estimate a population mean µ. Find the margin of error M.E, that…

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Q: Given the sample data {1, 2, 3, 2, 7} (a) Calculate the mean. (b)Calculate the standard deviation.

A: Given Sample data: 1,2,3,2,7 Mean is define as the average value of the data. It can expressed as…

Q: Many families in California are using backyard structures for home offices, art studios, andhobby…

A: Let us consider X be a random variable which denotes the cost of shingled backyard structure which…

Q: 300 high school students were asked how many hours.of TV they watch per day. The mean was 2 hours,…

A: Given that: Mean=2 Standard deviation=SD=σ= 0.5 Confidence level= 90% n=sample size=n=300   So…

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A: Solution

Q: school administrator to declare that the mean score for the​ state's eighth graders on this exam is…

A: Given that  Sample size(n) = 84 Sample mean score (x¯) = 290 Population standard deviation (σ) = 36…

Q: The sample standard deviation is a measure of what?

A: The sample standard deviation is a measure of spread of scores within a sample data.

Q: 4. The variance of a data set is 3410.56. Find the standard deviation for the data set.

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Q: Determine the point estimate, p and the sample standard deviation, S5.

A: here n = 439 x= 162 here x= no of students working full time while going to school

Q: The average speed of 64 random cars traveling on a certain highway was 80 km/h and the sample…

A: We have given that,  Average speed (x̄) = 80 , standard deviation    (s) = 20, Confidence level(C.I)…

Q: Suppose that scores on the mathematics part of the National Assessment of Educational Progress…

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Q: A researcher wishes to see if there is a difference between the mean number of hours per week that a…

A: The given claim is that, male and female college students spend a different amount of time online…

Q: What is the standard deviation for the data given: 12, 18, 16, 22 Select one: а. 17.33 b. 13 c. VT3

A: Solution : Given data is :12,18,16,22 x¯=∑xin=12+18+16+224=17

Q: A sample of n=10 scores has SS=74.What is the estimated standard error for the sample mean?

A: Givensample size(n)=10sum of squares(ss)=74

Q: Consider population data with 5 being the standard deviation, 5 being the mean. Compute an 88.9%…

A: It is given that the mean is 5 and the standard deviation is 5.