The family incomes in a certain city in 1970 had a mean of $14,200 with a...
The family incomes in a certain city in 1970 had a mean of $14,200 with a standard deviation of $2,600. A random sample of 75 families taken in 1975 produced y=$15,300
a). Assume sigma has remained unchanged and test to see whether mean income has changed using a 0.05 level of significance.
b). Construct a 99% confidence interval on mean family income in 1975.
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The family incomes in a certain city in 1970 had a mean of
$14,200 with a...
2. After conducting a census in 1970, the family incomes in a certain city were found...
2. After conducting a census in 1970, the family incomes in a certain city were found to have a mean of $14,200 with a standard deviation of $2600. A random sample of 75 families taken in 1975 produced x¯ = $14, 930 (in 1970 dollars, after adjusting for inflation). Assume throughout this problem that the standard deviation of family incomes is the same in 1975 as it was in 1970. a) Identify each of the numbers $14200, $2600, and $14930...
The family incomes in a town are normally distributed with a mean of $1300 and a...
The family incomes in a town are normally distributed with a mean of $1300 and a standard deviation of $600 per month. If a given family has a monthly income of $1000, what is the z-score for this family's income? (round to the hundredths place) Flag this Question Question 90.6 pts The family incomes in a town are normally distributed with a mean of $1300 and a standard deviation of $600 per month. If a given family has a monthly...
A sample of 100 family incomes has a mean of $100,000 with a standard deviation of...
A sample of 100 family incomes has a mean of $100,000 with a standard deviation of $10,000. The 95% confidence interval estimate for the mean of the population is : Group of answer choices $90,000 to $110,000 $98,350 to $101,650 $81,400 to $119,600 $98,040 to $101,960.
A study estimates the mean annual family income for families living in public housing in Chicago....
A study estimates the mean annual family income for families living in public housing in Chicago. For a random sample of 30 families, the annual incomes (in hundreds of dollars) are here: 133 140 127 150 133 114 128 142 123 172 146 110 135 136 158 120 189 106 144 134 161 143 170 120 142 150 174 109 162 129 (a) Produce appropriate plots and predict on the shape of the population distribu- tion? (b) Find and interpret...
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7. in an area. A sample survey is to be conducted to determine the mean family...
7. in an area. A sample survey is to be conducted to determine the mean family income The question is, how many families should be sampled? In order to get more information about the area, a small pilot survey was conducted, and the standard deviation dollars. of the sample was conducted to be five hundred Ine spoOnsor of the survey wants you to use the ninety-nine percent confidence coefficient. Further, if you find the sample mean family income to be...
Suppose that a random sample of ten recently sold houses in a certain city has a...
Suppose that a random sample of ten recently sold houses in a certain city has a mean sales price of $295,000, with a standard deviation of $14,000. Under the assumption that house prices are normally_distributed, find a 99% 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 of...
1. An equal number of families from eight different cities of various sizes were asked their fami...
1. An equal number of families from eight different cities of various sizes were asked their family incomes and how much ney they spent for food, clothing, and housing per year. The city sizes (x1), average annual family income (2), and average family expenditure (y) are summarized below. (City size in 1000s, family income and expenditure in $100s.) City Size ( 30 50 75 100 150 200 175 120 Income (x2) Expenditure (y):65 77 7980 82 90 84 81 122...
A) A certain region would like to estimate the proportion of voters who intend to participate...
A) A certain region would like to estimate the proportion of voters who intend to participate in upcoming elections. A pilot sample of 25 voters found that 17 of them intended to vote in the election. Determine the additional number of voters that need to be sampled to construct a 95% interval with a margin of error equal to 0.06 to estimate the proportion. The region should sample ____ additional voters. B) Determine the sample size needed to construct a...
a) Approximately 500 students take a particular college statistics course each year. As an exercise, each...
a) Approximately 500 students take a particular college statistics course each year. As an exercise, each of the 500 students in the class is given a different random sample of the previous year's 500 final grades (in percentages) and asked to construct a 95% interval estimate of the previous year's overall average. Which of the following statements is correct? About 475 of the confidence intervals will contain the actual overall average for the previous year. It is probable that 475...
7. in an area. A sample survey is to be conducted to determine the mean family income The question is, how many families should be sampled? In order to get more information about the area, a small pilot survey was conducted, and the standard deviation dollars. of the sample was conducted to be five hundred Ine spoOnsor of the survey wants you to use the ninety-nine percent confidence coefficient. Further, if you find the sample mean family income to be...
Suppose that a random sample of ten recently sold houses in a certain city has a mean sales price of $295,000, with a standard deviation of $14,000. Under the assumption that house prices are normally_distributed, find a 99% 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 of...
1. An equal number of families from eight different cities of various sizes were asked their family incomes and how much ney they spent for food, clothing, and housing per year. The city sizes (x1), average annual family income (2), and average family expenditure (y) are summarized below. (City size in 1000s, family income and expenditure in $100s.) City Size ( 30 50 75 100 150 200 175 120 Income (x2) Expenditure (y):65 77 7980 82 90 84 81 122...
a) Approximately 500 students take a particular college statistics course each year. As an exercise, each of the 500 students in the class is given a different random sample of the previous year's 500 final grades (in percentages) and asked to construct a 95% interval estimate of the previous year's overall average. Which of the following statements is correct? About 475 of the confidence intervals will contain the actual overall average for the previous year. It is probable that 475...
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