1. A survey of 30 households found that the mean age of an LED TV is 5 years. Assuming the standard deviation of the population is 0.75 year, find the best point estimate of the population mean and the 99% confidence interval of the population mean.

Q: an exam score has a mean of 506 and a standard deviation of 100. What exam score corresponds to a…

A: μ  = 506 , σ = 100  Z~ N(0,1)

Q: The mean value of the 130 observation is 17 with standard deviation deviation equal to 0.98. Find…

A:

Q: A dataset of 23 values on a variable has a mean of 10.8 and a standard deviation of 3.2. The third…

A:

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean…

A: Given that :  Mean = 14 inches S. D = 3 inches Here we use standard normal distribution concept…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 99.2 and a standard…

A: Given info: IQ scores are normally distributed with a mean of μ=99.2 and a standard deviation…

Q: An educational study to be conducted requires a test score in the middle 40% range. If the mean is…

A: Let us assume X=score Given that X follows a normal distribution with mean= 100 and standard…

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A: The sample mean and the standard deviation are μ = 80 and σ = 12 respectively.Let X denotes the…

Q: the standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish…

A: Obtain the 95% confidence interval for the mean weight of newborn elephant calves. The 95%…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.6 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: If a population has a mean of 15 and standard deviation of 3, what is expected of the sample mean…

A:

Q: The data shown to the right for the dependent variable, y, and the independent variable, x, have…

A:

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

Q: Determine the minimum sample size needed if we want to estimate the mean age of Camden County…

A: Obtain the required sample size: The given confidence level 100*(1–α)% = 95%. The critical value is…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.6 and a standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.1 and a standard…

A:

Q: The gestation period for human births can be taken as normally distributed with a mean of 266 days…

A: Given:

Q: A simple random sample of 64 observations was taken from a large population. The sample mean and the…

A:

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: Assume that adults have IQ scores that are normally distributed with a mean of 96 and a standard…

A: We have given that  Mean of 96 and a standard deviation 20.9. X~Normal(μ=96,σ=20.9)

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.6 and a standard…

A: Given: x~N(μ,σ)μ=95.6σ=24.3

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 a standard…

Q: Can the standard deviation of a data set be zero

A: Standard deviation can not be negative.

Q: Determine the mode and standard deviation of the data

A: The frequency distribution from given graph is written as,: underline; position: relative;…

Q: The mean score of a random sample of 60 students is 145 with a standard deviation of 40. Find the…

A:

Q: A simple random sample of 64 observations was taken from a large population.  The sample mean and…

A: Solution-: Given: n=64,x¯=320,s=120 We want to find the standard error of the sample mean=?

Q: Assume that adults have iq scores that are normally distributed with a mean of 98.2 and a standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.1 and a standard…

A: According to the given information in this questionWe need to find first quartile

Q: Assume that adults have iq scores that are normally distributed with a mean of 97.9 and a standard…

A:

Q: A sample of size 50 will be drawn from a population with mean 73 and standard deviation 8. Find the…

A: Given Information: To find out the 19th percentile of the sample mean.

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.8 and a standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.8 and a standard…

A:

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.7 and a standard…

A: Given Data : Population Mean,μ = 100.7 Population Standard Deviation,σ = 18.9

Q: If corn has a normally distributed yield with a mean of 120 bushels per acre and a standard…

A: Given that,  E(X) =120 bushels pet acre Sigma=10 bushels We have to find the percentage of acres…

Q: The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean…

A: Mean==14Standard deviation==3

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96 and a standard…

A: Given information Normal Distribution N(96,19.3) mean (µ) = 96 standard deviation (σ) = 19.3 X…

Q: 5 will be drawn from a population of test takers with a mean of 150 and standard deviation 9. Find…

A: Given that  Sample size (n) = 75 Population mean (μ) = 150 Standard deviation (σ) = 9   We know that…