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A random sample of 526 households from a certain mid-western city was selected, and it was...
A random sample of 540 households from a certain mid-western city was selected, and it was...
A random sample of 540 households from a certain mid-western city was selected, and it was determined that 126 of these households owned at least one firearm. Using a 98% confidence level, calculate a lower confidence bound for the proportion of all households in this city that own at least one firearm. (Give your answer to 3 decimal places.) 191 X
A random sample of size 32 is to be selected from a population that has a...
A random sample of size 32 is to be selected from a population that has a mean μ = 48 and a standard deviation σ of 13. (a) This sample of 32 has a mean value of x, which belongs to a sampling distribution. Find the shape of this sampling distribution. skewed right approximately normal skewed left chi-square (b) Find the mean of this sampling distribution. (Give your answer correct to nearest whole number.) (c) Find the standard error of...
Suppose that a random sample of fourteen recently sold houses in a certain city has a...
Suppose that a random sample of fourteen recently sold houses in a certain city has a mean sales price of $275,000, with a standard deviation of $11,000. Under the assumption that house prices are normally distributed, find a 90% confidence interval for the mean sales price of all houses in this community. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to the nearest whole number (If necessary, consult a list...
in a simple random sample of 190 households, the sample mean number of personal computers was...
in a simple random sample of 190 households, the sample mean number of personal computers was 2.78. assume the population standard deviation is 0.41. a) a 99.8% confidence interval for the mean number of personal computers is ----< mean <----- 2) a simple random sample of eight college freshman were asked about how many hours of sleep they typically got per night. the results were 7.5, 8, 6.5, 24, 8.5, 6.5, 7, 7.5 a) the data contains an outlier that...
A random sample of size 39 is to be selected from a population that has a...
A random sample of size 39 is to be selected from a population that has a mean μ = 53 and a standard deviation σ of 15. (a) This sample of 39 has a mean value of x, which belongs to a sampling distribution. Find the shape of this sampling distribution. -skewed right -approximately normal -skewed left -chi-square (b) Find the mean of this sampling distribution. (Give your answer correct to nearest whole number.) (c) Find the standard error of...
1. A random sample of n measurements was selected from a population with standard deviation σ=13.6...
1. A random sample of n measurements was selected from a population with standard deviation σ=13.6 and unknown mean μ. Calculate a 90 % confidence interval for μ for each of the following situations: (a) n=45, x¯¯¯=89.8 ≤μ≤ (b) n=70, x¯¯¯=89.8 ≤μ≤ (c) n=100, x¯¯¯=89.8 ≤μ≤ (d) In general, we can say that for the same confidence level, increasing the sample size the margin of error (width) of the confidence interval. (Enter: ''DECREASES'', ''DOES NOT CHANGE'' or ''INCREASES'', without the...
Suppose a randomly selected sample of n = 68 men has a mean foot length of...
Suppose a randomly selected sample of n = 68 men has a mean foot length of x = 26.7 cm, and the standard deviation of the sample is 3 cm. Calculate an approximate 95% confidence interval for the mean foot length of men. (Round the answers to one decimal place.) ____ to_____ cm important note : When working on the confidence interval for the population mean, have the standard error go to 5 decimal places. Then, input the answers to...
Let x be a binomial random variable with n = 20 and p = 0.05. Calculate...
Let x be a binomial random variable with n = 20 and p = 0.05. Calculate p(0) and p(1) using Table 1 to obtain the exact binomial probability. (Round your answers to three decimal places.) p(0) = p(1) = Calculate p(0) and p(1) using the Poisson approximation. (Round your answer to three decimal places.) p(0) = p(1) = Compare your results. Is the approximation accurate? No the approximation is not accurate. At least one the differences between the probabilities from...
Each front tire on a particular type of vehicle is supposed to be filled to a...
Each front tire on a particular type of vehicle is supposed to be filled to a pressure of 26 psi. Suppose the actual air pressure in each tire is a random variable X for the nght tire and Y for the left tire, with joint pdf as follows. otherwise (a) What is the value of K? (Give answer accurate to 2 decimal places.) 7.88 x 10-6 (b) What is the probability that both tires are underfilled? (Give answer accurate to...
In a sample of 55 randomly selected students, 24 favored the amount being budgeted for next...
In a sample of 55 randomly selected students, 24 favored the amount being budgeted for next year's intramural and interscholastic sports. Construct a 90% confidence interval for the proportion of all students who support the proposed budget amount. (Give your answers correct to three decimal places.) Lower Limit Upper Limit You may need to use the appropriate table in Appendix B to answer this question.
A random sample of 540 households from a certain mid-western city was selected, and it was determined that 126 of these households owned at least one firearm. Using a 98% confidence level, calculate a lower confidence bound for the proportion of all households in this city that own at least one firearm. (Give your answer to 3 decimal places.) 191 X
Suppose that a random sample of fourteen recently sold houses in a certain city has a mean sales price of $275,000, with a standard deviation of $11,000. Under the assumption that house prices are normally distributed, find a 90% confidence interval for the mean sales price of all houses in this community. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to the nearest whole number (If necessary, consult a list...
Each front tire on a particular type of vehicle is supposed to be filled to a pressure of 26 psi. Suppose the actual air pressure in each tire is a random variable X for the nght tire and Y for the left tire, with joint pdf as follows. otherwise (a) What is the value of K? (Give answer accurate to 2 decimal places.) 7.88 x 10-6 (b) What is the probability that both tires are underfilled? (Give answer accurate to...
In a sample of 55 randomly selected students, 24 favored the amount being budgeted for next year's intramural and interscholastic sports. Construct a 90% confidence interval for the proportion of all students who support the proposed budget amount. (Give your answers correct to three decimal places.) Lower Limit Upper Limit You may need to use the appropriate table in Appendix B to answer this question.
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