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1. A survey of 200 students is selected randomly on a large university campus. They are asked if they use a laptop in class to take notes. Suppose that based on the sNurvey, 70 of the 200 students responded "yes."
a) What is the value of the sample proportion p?
b) What is the standard error of the sample proportion?
c) Construct an approximate 95% confidence interval for the true proportion p by taking ; 2 SEs from the sample proportion.
2. From a survey of 250 coworkers you find thaNt 155 would like the company to provide on-site day care.
A cohort study was designed to look at the association of pesticides and the occurrence of childhood leukemia. Children living in rural areas were followed and leukemia rates were compared between those children living in areas with high and low p..
Each week, employees perform an inventory for a sample of products. Certain products are selected and counted. The actual count is compared to the book count (the quantity in the records that should be in stock).
Suppose you perform a hypothesis test relating to environmental toxins in a thriving small city in West Virginia. Discuss the risk to all interested parties in the scenario if you make a Type I error and if you make a Type II error
At α = 0.01, is the degree of certainty independent of credits earned?
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
What do you think of this sampling strategy? What impact does it have on the ability of the charts to detect assignable causes.
Description of the graph:A given histogram: normal distribution bell curve that is skewed to the left. On the x-axis of the graph, from left to right have the following numbers 0 , 50, 100.
A financial advisor has recommended two possible mutual funds for investment: Fund A and Fund B. The return that will be achieved by each of these depends on whether the economy is good, fair, or poor.
Calculate each project's expected return, variance, and standard deviation. Rank the projects on the basis of (1) expected return and (2) risk. Which project would you choose?
1 two researchers are interested in examining the relationship between level of education and level of volunteerism
The random variable X is the distribution of siblings of a student selected at random from a particular secondary school. Its probability distribution is given in the table.
the estimate of the population proportion is to be within plus or minus .04 with a 98 percent level of confidence. the
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