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Question: The American Community Survey (ACS), part of the United States Census Bureau, conducts a yearly census similar to the one taken every ten years, but with a smaller percentage of participants. The most recent survey estimates with 90% confidence that the mean household income in the U.S. falls between $69,720 and $69,922. Find the point estimate for mean U.S. household income and the error bound for mean U.S. household income.
Federal administration stated that unemployment level in US is 8.6% (population proportion = 0.086). A hypothesis test is to be performed to decide whether unemployment level in NY State differs from national level.
If the theater has 100 seats, find the probability that 6 or more patrons will not show up for the sold-out performance.
What is the difference between systematic random sampling and stratified random sampling..
a statistician selected a sample of 16 accounts receivable and determined the mean of the sample to be 5000 with a
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
What level of contributions was exceeded by only 20% of the itemized returns in this income group?- What level of contributions was exceeded by 40% of the itemized returns in this income group?
The following table shows the number of miles driven in each trial.
According to the historical data, the life expectancy in the United States is equal to the life expectancy in Japan. A new study has been made to see whether this has changed.
a statistical model for appraisal value of houses is needed. an important predictor variable of appraised value is the
Suppose that the researcher from the previous problem repeated the study of married couples' initials using twice as many participants and obtaining observed frequencies that exactly double the original values. The resulting data are as follows:
Find the mean and standard deviation of the difference in price of a ticket to China and a ticket to France.- Do you need to make any assumptions in calculating these means? How about the standard deviations?
The weight of children in the U.S. are normally distributed with a mean of 8.0 pounds and standard deviation of 1 pound
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