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1.) A survey showed that 850 of the 1600 adult respondents who live in a household without landline phones.
(a) Construct a 95% confidence interval estimate of the proportion of adults living in a household without landline phones. Show all work. Include description of how confidence interval was constructed.
(b) Describe the confidence interval in everyday language.
2.) A random sample of 900 SAT scores has a sample mean of 1100. Assume that SAT scores have a population standard deviation of 300.
(a) Construct a 95% confidence interval estimate of the mean SAT scores. Show all work. Include description of how confidence interval was constructed.
web crawlers need to estimate the frequency of changes to web sites to maintain a current index for web searches.
The manager of a CVS drugstore in Madison, Wisconsin, obtained a random sample of customers who purchased adhesive bandages.
According to the Center for Work-Life Policy, a survey of 500 highly educated women who left careers for family reasons found that 66% wanted to return to work.
What is the probability that in the next six? flights, exactly four flights will be on? time?
Assume the population is normally distributed. At ???? = .01, is there enough evidence to support the union's claim?
in an article about the cost of health care money magazine reported that a visit to a hospital emergency room for
A retail manager in a discount store wants to establish a policy of the number of cashiers to have on hand and also when to open a new cash register. The first step in this process is to determine the rate at which customers arrive at the cash reg..
How many models are fit at Step 1 of the stepwise regression?- How many models are fit at Step 2 of the stepwise regression?
This assignment is designed to test your knowledge about the first two major topics, Descriptive Statistics and Probability and Probability Distributions.
Perform the test as it should have been done and find if you come to a different conclusion. Explain why the results were different and why your test was a stronger and more reliable test.
The task will take between 8 minutes & 11 minutes. Find this probability. The engineer would also like to know what the time is such that 40% of the task times are less than this value.
regression analysis and cost estimationthe ceo of carson company has asked you to develop a cost equation to predict
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