The population standard deviation for the height of students from STAT class is three inches. If we want to be 98% confidence that the sample mean height is within one inch of the true population mean height, how many randomly selected students must be surveyed?

Q: If you want to be 99% confident of estimating the population mean to within a sampling error of ± 5…

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Q: A population has a standard deviation of 18. On average, how much difference should exist for a…

A: It is given the population standard deviation is 18.

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A: The mean is 500 and the standard deviation is 100.

Q: our sample consists of 43 subjects, with a mean of 36.1 nd standard deviation of 2.56.

A: Given information: μ=36.82n=43x¯=36.1s=2.56

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: A one-sample z-test was conducted in which the sample mean was 76, the population mean was 82, the…

A:

Q: For a population with mean 80 and standard deviation 6, what is the z-score corresponding to X = 68…

A: Given :Population mean u=80Standard deviation σ=6X=68

Q: The Stanford-Binet IQ test is scaled so that scores have a mean of 100 and a standard deviation of…

A: Let "X" be the Stanford-Binet IQ test

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A: Using Excel formula “=NORM.S.INV(1-(0.04/2))”, the critical value for 96% confidence level is…

Q: A test to measure the gullibility of college students is designed to have a mean of 70 and a…

A:

Q: A boxer would like to know the mean diameter of a navel orange. If the standard deviation is 0.3…

A: Given Standard deviations=0.3 Margin of error=0.1 At 95% confidence z=1.96

Q: A population has a standard deviation of 18. On average, how much differece should exist for a…

A:

Q: The IQ test has a mean of 100 and a standard deviation of 15.  Suppose a simple random sample of 150…

A: Ans - Given, The IQ test has a mean μ = 100 and a standard deviation of σ = 15.  Suppose a simple…

Q: A researcher wishes to estimate within $5 the average repair cost of for a refrigerator. If she…

A: Population standard deviation is 15.50. The z-critical value for 90% confidence interval is 1.645…

Q: In a random sample of 48 people, the mean body mass index (BMI) was 28.3 and the standard deviation…

A: Given that Random sample size(n) =48 Mean body mass index (x¯)=28.3 Sample standard deviation (s)…

Q: A Survey among Seniors revealed that the number of hours spent Studying the week before final exams…

A: Give Standard deviations=7 Mean=25 P(x>40)=?

Q: The mean and standard deviation of a population are 200 and 20, respectively. Suppose samples of…

A: Given : μ = 200 , σ= 20 and n= 36

Q: If the manager of a bottled water distributor wants to​ estimate, with 90​% confidence, the mean…

A: According to the provided information,

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A:

Q: If the standard deviation of sample A  is 5 and the standard deviation of sample B  is 12, what is…

A:

Q: A test is made of Ho: μ = 100 vs. Ha : μ ≠ 100. Given a sample size of 100 and its mean of 97 and…

A:

Q: When testing a hypothesis about a single mean, if the sample size is 51 and the population standard…

A: From the provided information, Sample size (n) = 51 The population standard deviation is known.

Q: If the population standard deviation is 10, how large a sample is necessary to have a standard error…

A: The population standard deviation is 10 and the standard error is less than 5 points.

Q: For a random sample of 9 women, the average resting pulse rate is x-bar = 76 beats per minute, and…

A:

Q: If the manager of a bottled water distributor wants to​ estimate, with 90% ​confidence, the mean…

A: Determine the sample size n needed. Here, confidence level is 0.90.   Use EXCEL Procedure for…

Q: 1. The average height of the students in a famous college in the city is unknown but the standard…

A: 1. The population standard deviation is 0.8, sample size is 49, and sample mean is 6.1. Computation…

Q: The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is…

A: Solution: Let X be the number of miles between services. From the given information, X has mean…

Q: The heights of 100 high school students are measured, with a mean of 175 cm and a standard deviation…

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Q: How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?…

A: Solution: It is given here that the confidence level is 95% The margin of error, E = 3 The…

Q: If the population standard deviation is σ=10, how large a sample is necessary to have a standard…

A: σ=10   The standard error is given by SE = σn n = (σSE)2

Q: given a standard deviation of + or - 0.023m at the 90% confidence level, what is the 68% error level…

A: The confidence level of the data is 90%. The standard deviation of the data with error percentage is…

Q: The population standard deviation for the height of high school basketball players is three inches.…

A: Solution: 6. From the given information, confidence level is 0.95, σ=3 inches and E=1.

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are thez-scores for the…

A: Introduction: Consider X as a normally distributed random variable, with mean μ and standard…

Q: Suppose the mean​ per-person check for brunch at a restaurant chain is approximately ​$11.75.…

A: Given, Mean, μ = 11.75 Standard deviation, σ = 3 Margin of error, E = 0.75 At 95% confidence level…

Q: The percent fo Coloradans that own a Subaru is 56%. If you were to take a random sample of size 70,…

A: We have given that,  Let X be the random variable from binomial distribution with probability (p) =…

Q: Nabisco claims that Chip Ahoy Cookies have an x=28.67 per cookie with a SD=2.67. Assuming this…

A: Here, the sample standard deviation is given as 2.67.

Q: The standard deviation of the sample mean is less than the standard deviation of the population.…

A:

Q: To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19…

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Q: Given that the population standard deviation equals 273 and the sample size consists of 741…

A: Given information- Population standard deviation, σ = 273 Sample size, n = 741 We have to find the…

Q: How large a sample of state employees should be taken if we want to estimate with 98% confidence the…

A: If the sample is more than 30 then we say that it is large sample test. When mean and standard…

Q: If the Standard Error SE( y ) is 1.299 and if the sample standard deviation is 4.87, what is the…

A: It is given that S.E(mean) = 1.299 Sample SD s = 4.87

Q: Calculate the standard error for a sample mean when the population standard deviation is 221.6 and…

A: Given data N = 36 SD = 221.6

Q: The manager of a certain TV station claimed that the average rating of people watching their…

A: We have given that  Hypothesized population mean = 60.5  sample size  =35 Standard deviation =13.5…

Q: The standard deviation of the distribution of sample means would be equal to:

A: The standard deviation of the distribution of sample means would be equal to ?

Q: Calculate the standard error for a sample mean when the population standard deviation is 250.1 and…

A: here given population standard deviation,σ=250.1 sample size , n=10,823   formula for standard…

Q: If you want to be 95% confident of estimating the population mean to within a sampling error of ±3…

A: Given that, Critical values: Using the z-table, the critical value at 95% confidence level for a…

Q: The mean salary of all employees in a company is $3,485, and the standard deviation is $1,870. Find…

A:

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.

Q: The standard deviation of a sample is 3.0 and the standard error is -16.52, what was the original…

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