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1. Approval rating. A newspaper reports that the governor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
2. Amendment. The Board of Directors of a publicly traded company says that a proposed amendment to their bylaws is likely to win approval in the upcoming election because a poll of 1505 stock owners indicated that 52% would vote in favor. The Board goes on to say that the margin of error for this poll was 3%.
a) Explain why the poll is actually inconclusive.
b) What confidence level did the pollsters use?
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
a pump is used to raise the pressure of water from 0 psig to 55 psia. how much power in kw will be required to pump
in a game of chance a number of draws are made with replacement from a box of tickets 500 of these tickets are labeled
Find the 90% confidence interval for the variance and standard deviation of the ages of seniors at oak park college if a sample if 24 students has a standard deviation of 2.3 years.
we must be able to assign a probability distribution or probability function to the random variable X. So, what is the distribution of X when X ~ bin(n, p)?
we wish to design a study to assess risk factors for stroke and dementia. there are two primary outcome measures. the
consider rolling two fair dice one green and one red. let r be the random variable which determines the face value of
You have met an acquaintance for lunch, and he is worried about an upcoming meeting with his boss and some executives from his firm's headquarters. He has to outline the costs and benefits of some alternative investment strategies.
Company A is hoping to expand its operations and a small group of investors is visiting next week. You are tasked with the duty of explaining how Company A uses this information from a linear programming model to optimize its shipping.
The following data is postulated to have been sampled from an exponential E (4) population. Validate the postulated model appropriately. Repeat the validation exercise as if the population parameter was unknown and hence must be estimated from the..
The grades have a bell-shaped distribution. Based on this information, which one of the following is the best estimate of the number of students with grades between 55 and 83?
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